Chevy Silverado Cracked Intake Manifold - 5.7L Vortec Intake Manifold Coolant Leak
Vložit
- čas přidán 2. 02. 2016
- In this video I show a less common find of a cracked lower intake manifold on a 1997 Chevy Silverdo truck with a 5.7L Vortec engine. Although leakage at the intake manifold gaskets is a common issue, this particular problem is less common and more difficult to identify. I show the use of a bore scope camera and cooling system pressurization to inspect and confirm the cause of this particular issue. Thanks for watching and please subscribe to my channel!
- Auta a dopravní prostředky
A month ago I told you that I would roll the dice and just change the intake manifold gaskets.Well success!$54. later she is on the road.After starting it up it still smoked. However it cleared up after taking it for a test drive.Because of a botched install of gaskets from a garage the person that I got the truck from just gave the truck to me for scrap.She is running well now. Lucky me.Because the truck burned so much antifreeze it contaminated the EGR which I cleaned and buggered up the O2 sensor and replaced it.I was still afraid that there might be a cracked head when the vehicle was still smoking so I tried this kit from U View and it confirmed I had no exhaust gas in the cooling system. Thank you so much for you incite.If I get one of my bucket list wishes it will to be to ride up to Alaska with my motorcycle carrying enough Beer to sit up all night and swap Manly Stories LOL.Thanks again and take care.
Thanks for posting this video , I think it confirms what I've finally worked out over three years of battling my 98 Chevy suburban vortec , I fitted a rebuilt motor five years back , three years now I've been destroying starter motors noticing vape fromthe exhaust on first start up , hard start , engine lock up and kick bak on cranking , no real loss of coolant but a little bit ,engine seemed to develop excessive psi on attempted start , if you got thru a couple of attempted starts with a bit of blowback etc then it'd fire and run , there was always a little intermittent miss ,and scanner showed extra fuel being dumped in the right bank I thought it was a small exhaust gasket leak , truck would start fine if it'd been recently run , no coolant in oil ,kept blaming crank sensor cam sensor knock sensor you name it ,even replaced distributor ,never throws a code ,after several months sitting and fail to start killing another starter I pulled the plugs and find two cyl have rust on plugs and detonation signs on all plugs , it's gotta be a small intake manifold leak that causes some kind of hydraulic pressurising when trying to start after it's been sitting thru coolant biuld up in the two bores ,if recently run it must not be enough coolant to cause excessive psi in bores and it must be small enough to burn off when running , Chevy are rare in Australia so self diagnosing is really your only option ,hence my stupid three year journey , now I'm finding more US guys are warning of the damned manifold gasket failures , thanks again for helping and sharing your knowledge
Have a '99 Suburban with 197,000 got it 3yrs. old at 50,000. Oil every 3,000. One day a year ago engine noise and hard starting got my attention. Realized white smoke ( coolant ) from the exhaust, vey low coolant level, added some, put on a thermostat, then ran down to Valvoline Service and got flushed and refilled. I then used a coolant additive for gasket leaks, the white smoke quit. Changed plugs. Runs like new. Shortly after, the transmission quit. Changed fluid, got worse. Has the Transmission rebuilt $2000 and I am very happy. Expect another 100,000 miles.
Start saving money up because the "stop leak" is only a temporary repair, but the repairs are still far cheaper than a new $50,000 suburban!
You have described the symptoms of a vehicle that I am working on to a tee.I will roll the dice for you and get back to you on the results.Hell if it works and my truck runs again I won't have to take out another Mortgage to buy a new one.Love your videos and thanks for helping.You Da Man!
How did this turn out for you? Mine just did the same thing as well.
hay, car Dr, I have 99 GMC Suburban 5.7 Vortec L31 engine. very robust and reliable vehicle for me, I've put 125,000 miles on it. it's now 224,000 miles. I just replaced my intake manifold gaskets and bolts, heater coupler. bolts were stretched to a degree. coupler were rusted out. it took me complete full day to do it all. When I had the manifold off, I decarbonized the intake and the ports. cleaned it up pretty well. I put Al Delco brand in instead of felpro. it runs pretty dam good now. now that's done, I need to focus on my tranny, it needs to be rebuilt. Then I'm good for many miles to come. I love this truck :) love yar videos!
Nice, sounds like a productive day of work and im sure youll get lots of service out of it in the future now. Thanks for watching my vids buddy. Take care
I really like this channel, great info and I hope one day you can talk me through my Chevy problems for real! Lmao the Vape comment lol!
Perfect description of what happened to my 1998 Chevy with the 5.7. The intake manifold gasket failed (or the intake cracked) and the coolant filled the oil pan. The engine had 188,000 miles on it so had a rebuilt engine installed. It was a $2000 repair! What can I say, I need the truck. I'd like to have that one for the body, it looks straight.
+wyattoneable The body and frame are in excellent condition. I can put you in touch with the owner and you can come out with a trailer for it. But I think it will cost you about 10,000 in gas round trip. This is a 4X4 so even the labor to replace the engine is more. I can't even buy a quality reman (GM goodwrench) engine for much less than 2000 here. Oh well, I just hope I can actually fix some cars today. Thanks for stopping by!
+The Car Doctor That would be a fun road trip. I've done that drive through Canada before. I wonder if the Alaska highway has been paved since then? :)
Yes. It's paved all the way. Super fun drive. I've done it about 15 times.
@@ThecardoctorTV m
They had 5.7 s? 👁 👄 👁 Where ma wallet!!!
What I find amusing in all these cases where it will "cost more to fix than its worth" cases that the owner goes out and spends about 5 times as much again on a new or late model. Even more amusing is to hear the stories about all the costs and repairs on the new one after a few years. Had they fixed the old one they would have saved 1000s and be driving something more classic. Of course this is assuming the old one is not rusting to bits.
+Andrew Thompson You make valid points. We don't have a lot of rust here so that's not an issue. Replacing the engine and transmission along with other components in this case would probably end up around 10,000 and they likely decided it wasn't worth the investment. It is also a second car for the family and that no doubt factored into their decision. I thought to myself about offering something for the truck since it has brand new tires but then I counted the cost and even for me it's more than I care to spend on an older vehicle. We have become very disposable in our culture and it's a mindset that will likely only get worse in the future unless we go through major economic downturn and start being more careful about how we spend our money. Thanks for stopping by!
+The Car Doctor I guess I have an ever increasing worry about the quality and the pure time it takes to fix a modern car so these old trucks to me are more appealing. Maybe I'm getting old. Thanks for the videos.
I get it. These trucks run forever if maintained. The transmissions were a weak point in these years. But totally worth keeping on the road compared to getting yourself into a 600+ car payment plus insurance on a new one. Blessings.
Andy Thompson your right on the money. I have a 2000 Silverado that I drive daily now mind you I only put about 5000 miles a year on it but I have recently had to replace quite a bit of parts on it mostly original parts. Been a hell of a good truck with minimal rust on it and best of all it is paid for and the insurance is pretty cheap. Every time I have something that needs replaced my buddies say "why don't you get rid of that thing and get something newer". Now mind you I would love to have a nice fancy newer truck but im not in love with the idea of a $500+ payment a month. I will repair my older one when it needs it, take care of it, and keep it on the road as long as possible. When she rusts into I will get something newer.
A!a+
Absolutely Love Video !!! He has put it all out there to a T.....and then some ! Great channel will follow
My dad's 1996 gmc c1500 had this happen 2 or 3 times in the 185,000+ miles of ownership. . less than 10k miles when he bought it in 1997 (some dude hot wired his 85 monte carlo one night n wreaked it in front of the house as he attempted to flee from my dad) had to find a good vehicle fast.. I had the truck for a couple years then sold it.. that was a mistake it was a great truck least problematic vehicle I ever owned .. interior held up surprisingly well .. better than the 2016 Silverado he has now..
Absolutely love this guy
I've got a 1996 5.7L that has had a mystery leak for quite some time. I have used IronTite coolant system leak a couple of times which brought me results but eventually the coolant level snuck down and it overheated a couple of times.
I now have coolant in the oil, froth on the dipstick. It is idling a little rough now but not horribly. There could be a very small amount of white smoke (coolant in combustion) but if so not a lot.
This leaves me unsure as to whether the head or head gasket is leaking as well as the typical intake gasket problem on these 5.7s.
1995 yukon 5.7 not a vortechHas the same issue, vaping through the tailpipe, and loosing coolant. I believe that it's just the intake gasket. The plugs are not wet. The engine has great compression and the water pump is doing its job . Does not overheat when there is a full level of coolant. The crankcase does have some froth built up on the cap but inside the lifters look clean.
Glad I have the easier sbc 350 1994 Z71, had the original tbi aluminum intake pitted, so I went with a holeshot intake w/egr...I got a adapter plate quad to tbi...worked out great :)
Glad you’re happy with that but Vortec Heads!
I believe I am looking at the exact same failure in a 99' 4.3L Vortec. Same initial symptom of coolant going somewhere but no sign of leak or burn. I too thought the water pump when I seen a slight leak start. Upon starting the truck after buying the pump, bigger leak and spewed a bit of steam but it seem to clear up. Then I got on the road and it was steaming out the carb, would sit 200-210 like usual then sudden spike to 260 where all the coolant just flashed into steam. I raced to pop off the air intake, pcv hose and hold the throttle over to let the steam vent so it doesn't condense into the cylinders enough to hydrolock them. Once it calmed add some water to give it something to work with and get a mile or two more before red light and there it goes again. By time I got it home, which was a grand journey of 5 miles in 2 hours. I had rerouted PCV hose to the overflow tank, blocked off a couple lines with hose clamp. Struct a balance where the engine has a continuous flow of steam into the overflow via the PCV, but at such a rate it maintain 230 which I know these engine can actually handle since that's one option for the thermostat when I buy replacements. I am terrified to start breaking it down and seeing if I can save it or not.
Bro you should have just got a tow😂
Hey doc i got a94 gmc 350,had water pump issues fixed ths then truck still overheats did head gaskits ,now the overflow is filling up with back presure and pushing the antifreze out. I had noticed molding marks on intake that looked like cracks dont have a camera to check thow also top rad hose is full could it jus be the thermastate not opening,little heat in cab when runing..suggestions pls
Took my 94 Z71 in for a diagnosis, specifically for my o rings leaking from oil filter adapter housing. Local mechanic told me my "manifold intake gaskets" need to be changed soon but he told me not to worry about it because its "minor". What do you think I should do?
When i but cars or trucks. The first thing i check is the dipstick. If the oil has water bubbles in it i dont buy it. Unless i dont mind buying another motor. I just bought a truck like this for 350 because it had a cracked exhaust manifold and a broken bolt. But i fixed it and its running pretty good now. Still needs some spark plugs and small stuff.
That was $350 well spent!
Hay doc I just swapped out the CPI unit for a MPI and now I have an intake manifold gasket leak so I took it back off and replace the gasket again but I still have the same problem. What would you recommend
I have 1999 GMC 4x4 Suburban with 180K that just reared it's ugly head with this problem. It's only been driven 60 miles with the problem. I'm planning to take it in tomorrow to a local shop and see if I can get an estimate. What interesting is that it never show's it's overheating, although the "check guages" light has blinked on and off a few times. Tranny has been solid with no apparent issues. I'k like to keep this ride, although I do have other rides. It's been great to have for local trips that require space. and hauling. Other car's that I have are to small to add a trailer. I live in Texas and I'm hoping that the bill isn't to crazy. (under 1K). Time will tell. If it's too funky, probably will sell it, although not sure what it's worth in thie currrent condition. Sure do enjoy your videos.
Shouldn't be too spendy depending on the area. I guess 500-800 ish total. Good luck and thanks for dropping by!
Good info car doctor
Thanks
I just replaced the lower intake gasket and jb welded the nasty pitting from the blocked off rear side of the lower intake. Didn't last more than 100 miles and leaks again. Oil cap milky. Head gasket are new and did that test . So look like a new lower manifold and better gasket will solve my problem. Good thing it's easy job and fan shroud is still off so I can step inside the bay. Leaning over hurts my bones
The Car Doctor Cemetery where your vehicle gets put to rest. Amen !!
+Steve Rob "Rust in pieces" haha
+The Car Doctor
hahaha :D
Hey car doc quick question I have a vortex engine I just purchased recently. I installed to my 1987 Buick regal everything seems to be going fine. until I filled my radiator with coolant. then I noticed a leak coming from the driver's side on the back of the block. without the engine even being started can you please give me in idea of what symptoms that could be please?? Thank you
I have a 98 1500 5.7 vortec. Sits in the yard and runs cool. Can drive down the road and runs cool until you stop and it will gain temp. Goes little past 210. If you rev the engine it will get warmer. I have replaced the thermostat water pump and fan clutch. Thinking its the radiator not circulating. No water in the oil and not loosing any water. Any thoughts?
I recently purchased a 99 with 5.7 and the guy listed as will drive to california. I looked it over the next day and wow. He got me
Water in cylinders for sure because it would barely turn over . Then I started adding water with it off and water was coming out of the exhaust where the two pipes bolt together before cat . Yeah it happens
I have a1999 5.7 with coolant in the EGR tube going to ex.manifold think it might be intake
My 5.7 99 Yukon left me down the street from my home was overheating stopped it . Next day filled it with water n it looks it's leaking from the water pump prior to this it would go over 210 n go back to middle the heat guage. Could it be the water pump? Or should I replace the manifolds im thinking of replacing the pump t stat n upper hose. N go from there
Great video! Thank you!! I have a similar problem, coolant puddles on the intake driver side. 93 gmc 1500, 350, 415,000 miles original engine.
Spark plugs get frosted white build up over 2 years.
No misfiring, good idle, smokes some but doesn't fog up the parking lot.
My daily driver. No rust just rebuilt front suspension brakes, tie rods. I plan to keep this truck, shooting for 1 million miles,.
Should I replace the intake, or just save for a lower mileage motor?
Any advice would help!
Thanks again for all the videos!
Hi I think I have this problem started with a po300 I thought plugs started there ....now I have changed heads lifters distributor pcm crank sensor .It runs pretty good but still I feel a misfire and that damn po 300 won’t go away . O I did change the intake gaskets too . Do you think this is a cracked intake ?
Hello The Car Doctor I believe I have this issue going on with my 1998 Chevrolet K1500 Tahoe.
WOW looks so much like my ..NEWER TO ME TRUCK EXCEPT MINE WAS ROLLED AND SMASHED A GAURD RAIL. TOOL OUT THE WHOLE FRONT END. THEN THEY DROVE IT TILL IT DIES OR GOT PULLED OVER .. not sure what one first so I fired it up before getting it. Of course .. also they cut the cats off and wires cut off as well. So I was assuming the miss was the 02 sensor.?? Well after all new front core support lites and NEW 4 core rad. Hoses and fan and pulled frame rail back straight. Filled up rad. Well I though. So after 4 gallons. It stated to piss put exhaust pipe…. Only drivers side. Lol. Oh let’s say I wasn’t to happy good thing is I have 3 more motors and 2 more parts trucks laying around. Just did not want to swap motors. But if it’s just the plastic intake. Sure. It’s my GUESS SO IF IT IS ILL SEND YOU PICS. ALSO THE TEMP GAUGE IS BURIED WAY PAST 260. Makes sense now. Plus I have a good idea how long/FAR IT WAS DRIVEN AFTER INCIDENTS… STUPID PEOPLE JUST DONT TAKE CARE OF ANYTHING ANYMORE THESE DAYS. SAD IS THE TRUCK WAS SWEET CONDITION LIKE NEW INSIDE AND OUT AND IN LESS THAN 6 months it’s total loss.
Bought the gasket set upper lower and plenum and rebuilt injectors for 289 spend the money they are worth it
Water pump, intake gasket snd after that you might need a rod and them a new motor and transmission. People need to run from places like this.
Just sent to Midas to ask for a checkup and my intake manifold was leaking and they asked for 1200 for repair with 930 on just labor! What do you think I should do? A cheaper solution perhaps?
Thank you it is a very good video✌🏼👍🏼 I have a toyota prius 2011 that is leaking in the combustion chamber , the 1st and 2nd spark plug get wet but I really don’t know where is it leaking from. Can you help me? I was thinking it was a blown Head Gasket . But it never turn on the overheating light
My 99 Tahoe 5.7 did this exact same thing last night. I got the check engine light, pegged temp needle and a ton of steam coming out of the right side of that same plastic intake plenum.
If i swap that part out how would i flush the crankcase out afterwards?
Drain oil and change filter. May want to repeat process once after running
I'm not familiar with the 5.7 Vortec. Why does the engine design flow coolant through the intake manifold? Do you know the reason?
+Ozzstar Good question. Many engines do this and I won't pretend to know all the reasons. One is that the flow of coolant needs to cross over from one cylinder head to another and then through the engine block. It's just a pathway to allow flow across the entire engine. Also, the hear get earthed from the flow of coolant prevents atomized fuel from hitting a cold intake base and turning into liquid this becoming less efficient as it enters the combustion chambers. I bet there are even more important reasons I haven't thought of but that's why I just fix them not design them. Well in this case I just read them their last rights! Thanks for watching.
+The Car Doctor
the hear get earthed?!? :p
They call me "The Undertaker"
The money the guys gonna spend on another truck would have fixed this problem for sure!! I have close to the same deal going on now I’m not looking forward to doing the head gaskets
But, IF you put in a gm crate "reman" motor, it would have a GM 3year/???mile warranty, and later, when the tranny crapped, you could have it redone as well, and then the truck would be practically a new one, since the most expensive parts of it have been redone. Sure, the book value is less than the repairs...but a new truck is $40,000+ nowdays, and has more crap on it to break! To me, if the frame, electrical, and body is in great condition, it's worth redoing! JMHO!
could you possibly tell me how much a 1982 sierra classic 3500 in great condition 72000 miles is worth .
Do you think exhaust manifold donuts can cause a p0171 code? I have a 98 k1500 Silverado 5.7 I'm trying to track down an exhaust or intake air leak but only thing I can find is water and air shooting out the exhaust donuts and rear flange...
I guess it's possible but not the most common cause.
I know this is an old video but this is the first I've found that matches my situation to a T. This is the lower manifold that has cracked correct? I would assume so but just wondering what to expect. Thanks in advance
correct, lower
@@ThecardoctorTV thanks for responding. We pulled it and found a crack last night. Will be replacing today. Thanks again for the video!
Is the 5.0 and the 5.7 the same
Great video. Can a bad lower intake gasket cause water(coolant) in a cylinder? Or is that strictly head gasket. Thank you
Re-watched vid...more than likely head gasket causing water in cylinder. Ho Humm
yes but it is possible if the intake gasket leaks allowing coolant into an intake runner. It would have to be a cylinder that shares a passage next to the water passage like #1, 2, 7 or 8 not very common. I have also had a cracked intake leak into the intake and run into multiple cylinders. Might want to try using a combustion leak detector kit to see if there is combustion in the cooling system.
I have a 98 GMC 1500 that had symptoms just like the 97 in this video. The last time I drove it (around 3 months ago), I was on the interstate and it overheated and wouldn't start back up. It was losing coolant like no tomorrow, making a loud whining noise, and puffing out white clouds. For a couple of months prior to this, I would get random no-starts from time to time, and gradually lost engine power and fuel efficiency (but it never died while idling, or surged). It had to be brought back to my home on a flat bed trailer, and it hasn't moved since. Could it be a blown intake gasket?
maybe but possibly two separate problems one a coolant loss and the other a no-start issue
I was checking the radiator on it yesterday, and I found a leak in one of the cooler lines. So I'm led to believe it's a radiator leak, and possibly a faulty crankshaft position sensor. Thanks.
Do you ever blink???
Hey doc, I have a 2001 8.1 gas where I would have intermittent puddles underneath on passenger side. Pressure tested and see if coming from what appears passenger side bottom of exhaust manifold. Prob working it's way down from somewhere. Just starting this dive and wondering if you have any insights.
Water pump? I know they leak and run down the oil pan and off the back.
Found it, broken connector on heater core dripping down. Gonna be a fun one, thanks!
Oh that's an easy cheap fix. Is it the hose quick connector?
Yes and spotted your video on how to fix it. I'm leak free!
I got the same problem, but the intake isn't cracked as far as I can tell anyway . seems more of an external leak In The front of the motor. I'm going to try and fix it . though the transmission does leak.
Very common issue of the gaskets failing. Be sure to use the updated gaskets for this since they wont leak after.
car doctor, I have a 1993 GMC sierra 4x4 I drove my truck for about 5 minutes after replacing the fuel pump when the throttle got stuck. I hear a noise coming from the throttle body. need help
Is it leaking vacuum at the gasket to intake?
hi my friend is leaking coolant from the passenger side I looked under his car a couple of days later when he told me I don't see no sign of current loss but it's on the floor respect the hoses and radiator and the cap they're all in good condition I haven't drove it out about a hundred miles and no overheating issues but no pressure in the hoses and no leak in the gaskets either can it be like that video you put where it's getting the oil in the bottom
Yes but the water pumps leak and its hard to see where its running out. Look for signs of coolant dripping off the passenger side of the oil pan gasket area along the length of the pan or along the front of the steering linkage area which would indicate a water pump leak. Other wise remove the oil drain plug and watch for any coolant running out.
thank u very much
I have a 99 vortec 350 that I am swapping over to carburetor and I am putting it in my 78 custom deluxe c10 I haven't really seen anyone do this but I have done it to a tbi motors out of a 93 gmc
What will you use for an intake manifold? Sounds cool.
A intake through jegs
If anybody owns any of these 5.7 L Vortech engines chip for you so you don’t have to pay $400 for an intake gasket go on Amazon and they’re only $85 for the whole kit intake gasket and head gaskets and all and the intake and the head gaskets aren’t plastic with the ceiling it’s metal with the ceiling component
Ok so you need to change your channel name to the car undertaker? your big stomach?? You look quite svelte on the camera. Great information Doctor!
+The Disgruntled Mechanic How about Doctor Kevorkian. Haha.
I like that too! have a good day sir.
Another day another one sent to the scrapyard in the sky! (At least Eric O donates his scrap metal proceeds to help animals)
+The Car Doctor yes that was a good video and idea. the size of the scrap metal you get you could support a shelter for years!
Haha. No kidding. I should change my motto " where cars die and pets live"
Hey I have a friend with the 5.7 vortec that is blowing steam through tailpipe and loss of coolent what could it be ...possibly the head gasket??? I’m not familiar with the v8 looks easy to work on though
Could be the intake gasket leaking into the engine. Is there any moisture in the crankcase?
Here's an oddity for ya leaking coolent water pumps good no coolent in oil oil pan checked out no chocolate milk no loss of performance 2007 4.8 GMC Sierra i was reading where another guy had the same problem and it was an external head gasket leak where it wasn't leaking into the block but out of the block and burning off?
Any assistance would be of great value lol
That can happen. Most likely cause of coolant loss is faulty water pump but head gaskets can leak into the combustion chambers, into the crankcase or externally.
Hey doc that's real funny cars coming lately here to die.
I got the flywheel removed from the Ford Focus...the flywheel is broken but the crank shaft is okay...jesus I have no idea how somebody can break a flywheel in a car that only makes 150 hp
Well, you bought a ford...LOL!
It might be worth it now.
Is it just me, or is 400$ really a lot of money for just an intake gasket?
Last weekend I replaced intake+exhaust gasket on my '86 Volvo: €15
+Koffi Banan 400 (or €1500 haha) is the cost of an entire intake manifold (kit) in this case a fairly large chunk of cast aluminum. But we are in Alaska where everything is more expensive I guess. I wish I hadn't replaced the water pump before discovering the bigger problem.
I just bought felpro upper & lower and all gaskets from advance auto $60
He blinked at 3:13
😂😂
the starter same
1996 Chevrolet Silverado 5.7 vortec 5.0 vortec starter the same
???
I bet this guy bought the truck from him cuz he wanted it put a new intake gasket on it it's still drives today oh yeah a used transmission is nothing for those years and a big block is 1,799
Hahahahhaha vapping!!!!!! Hahahhahah
hehehehe
Certainly makes sense to put money into a newer vehicle than repair that ole girl.
+ICU2 There will be a celebration of life for "Chev" today at 3PM
maybe if your where more optimistic and told the client that their repair cost is cheaper than a $40k Truck more people would value the old one being fixed
I try to help folks make the best decisions for sure. In most cases keeping the vehicle you have is the best choice.
Of course repairing its cheaper than a 40k truck, but on one with such high milage it's just going to be proplem after problem... Some people like to use their vehicles, not have them sit in a workshop every month
@@AnythingGasoline yea mechanics that see people monthly never last.
@@ThecardoctorTV i agree so long as parts still available
car doctor do you know
know what?
do you even vape bruh? lmfao
LT1 swap it