Why Is This 1968 Plymouth Roadrunner Shooting Flames Out Of The Carburetor? Let's Fix It!
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- čas přidán 20. 07. 2023
- I wish I'd gotten footage of the time (or three) this Roadrunner tried to give me a really fast haircut. Oh well... This awesome '68 Plymouth has already been to a couple other shops, and no one has quite been able to get to the bottom of the rough running and horrible back firing problem. In fact, a previous attempt resulted in a shop throwing up their hands and saying it must be caused by incorrect cam timing, or something. Not so fast, there... Let's work through every ignition part and every system in the carburetor first. And, once again, let's learn an important lesson - assume nothing. @rocketresto
- Auta a dopravní prostředky
Love that car... Back in the day, My buddy had a '68 Roadrunner 383 4 speed & I had a '68 Barracuda 383 auto, We beat those cars to death... The good old days.
Damn,you were in Mopar heaven for that video,jealous. Good for you.
I often am 😍 thanks!
I've always liked the clean look of white on B Body Mopars!👍
Nice MOPAR he did a nice job on detailing the Motor Love the 383 motor shame they painted over the Chrysler penastar badge on the guard they painted over the shock washer 🤦🏼but she’s a beauty . Good job 👍🏻.
Yes it’s definitely not a perfect restoration - but a really cool car. Awesome driver.
8.5 hour drive today, it's almost 1am but I'm still up. Why? Because Jamie put out a new video.
LOL
Agreed the '68 is the cream of the crop. I also loved the 66/67 Charger with a 383 4 speed. If you ever go to the north east for any reason LMK, would love to shake your hand in person. Great afternoon to you all.
Love your closing "And remember..." this time!
Not sure it's quite as important with a 904 Torqueflite, but hey, better safe than being called Stumpy the rest of your life.
Sweet ride!! I wish my 68 Satellite was as nice as that one but one day it will get there.
Edelbrocks rock I own my first one this year on a 5.2 magnum and it's all im going to bolt on to a daily driver street car for now on!
Totally agree! They’re just the best for street cars. Seriously easy mode.
My dream car is a 69 Roadrunner, but honestly, I'd take any year Roadrunner! Even a Coronet, or Belvedere.
But alas, they're way out of my paltry budget.
But a man can dream!
Love the white, it just looks so crisp on that car!
Nice video Jamie
They really are ridiculously priced these days. I have to hope they’ll come back down eventually, as I’d like to own one some day. Haha. And I agree - any of the similar cars are good in my book. I could care less if it was originally a meep-meep car - but it’s pretty dang cool. Haha.
68 is my favorite year for all a&b bodies. I had a 68 bee with 383 4 speed...Hurst shifter. Love that car. For those of us that are on a budget, the 75-9 b bodies have a lot of appeal with big blocks available for all but the last year. They can be made fast too!!!
I agree. B BODIES are Best Bodies. That looks like a very happy proud 68...I just wish they had the gauge cluster like the 70 roadrunner or 68-70 chargers. Awesome video as usual.
Love the 68s! Might try a stiffer governor spring for that 1-2 shift if the owner deems it necessary. Enjoy your videos!
Yes starting in 2nd gear is classic governor issue. Can be remedied without pulling the transmission.
Anytime behind the wheel of one of those cars makes you good . She sounds good .
That is a beautiful bird .
It sounds great. The carb and tuning woke it right up.
Beautiful car. Would love to get one eventually. Got a lime on a really nice 71 charger. No engine or trans but if I can find a good 440 and 727 I'll be in business.
The tuning videos are awesome. Super helpful info
Thanks! Another fun and educational video, sensei!
That's a nice driver.Great video.Thank you
Beautiful car! Great work!! 😊
The best way to adjust a kickdown is with a 3rd pedal👍
That definitely fixes a lot of the problems 😅
👍 As Lou C says, "the right amount of pedals"
Thanks Jamie
One more flame belching diagnosis trick. Pop the dizzie cap, grab the fan and roll the engine forth and back. See how much travel you get before the rotor moves. Loose/wore timing chain n gears can cause.....things. That engine doesn't look like a candidate for that though.
Good one. But yes - this was a fresh rebuild, and has under 3,000 miles in around eight years.
Don't call it a dizzy cap. Just don't...
You are one lucky guy all them mopars at your fingertips.
I'll just say that I love that car, too.
Nice. I have a 71 383 4 speed bench seat roadrunner. Like to see one go through 😅
Awesome! I’ve never yet gotten to touch a late Roadrunner, or ‘71 Charger R/T or Super Bee. I missed out on one of those at Rocket not long before I started. I hope to get a chance some day.
I agree, I felt the stripped down brawler thing at 4(1970) because Dad made me a Road Runner addict, I tried to fill that addiction with camaro's when I got my license, had a coupe nice ones, now that I realize my gear head addiction was actually started a year before kindergarten I didn't have a chance. Looking for a sort of bucket list filler of top 1 LOL.
They were very prominent on the late 60's Firebird's also. Love the hood mounted Tach.
My dad and me pick up same car in 68 ❤ new plastic still on the seats 3 miles on it
Roadrunners and Satellites are my Favorites!! Such a nice RR, I agree
Nice , love those cars .
Sweet video.
I hate to see Roadrunners because I miss the 69 White one l had.
Now the only old vehicle I have is 75 Corvette in white which is not a good substitute.
Dang it! That’s a bummer. Corvettes are fun too - but a different kind.
Couple of things. Trans issues. Governor pressure setting is wrong at the valve body. Seen this tons of times. That's why your shift out is so fast from 1st to second and why no kick down too. Also many times I have had to install cable kick down set up do to aftermarket carbs to get the Trans right. Donny has the same issue and will advise him to go to cable set up. Another thing that happens is stuck governor in the tailshaft housing. But doubt that is the issue here. Guys that build stock Trans go by stock specs on governor on the valve bodies and it makes them poochie. I do not. My shift outs are 1st to 2nd at 30mph and 2nd to 3rd at 45mph in normal driving and under harsh throttle this equates to 1st to 2nd at 45mph and a squawk lol then 2nd to 3rd at 60ish. Remember 383s love rpm so let them have it.😊
I don’t know anything about changing governor pressure. There was a 3-2 kickdown by the end of the job. I didn’t say as much in the video. The 1-2 was always immediate, and no 2-1 kickdown. I need to get a crash course in performance Torqueflites at some point in the near future. Donny got a correct throttle adapter for his Holley that give or take solved his problem. I’ve done a video on the cable, and it’s certainly an improvement, but even those damn things never quite end up exactly right.
@@DeadDodgeGarage Governor pressure is controlled by the kickdown linkage to some extent and largely by an adjustment screw on the valve body. I think it has a allen/hex on the end. Just need to drop the pan and use a small machinst's rule to measure the distance which adjusts the line pressure.
Can u wear out a band too soon with what appears to be too much pressure? If I remember, there's a pressure out on passenger side for gauge hook up?
@vincemajestyk9497 correct there is a port to check Trans pressure on the passenger side. You don't tighted that screw you loosen it. I would do it only a quarter turn at a time and try it.
@stuckinmygarage6220 no you won't take out a band. Bands go out from slippage and I recommend going slight tighter on the 2,3 kick down ba d. When you set the governor pressure higher. She will bang gears for sure lol
Flames! I like flames!!! As the great historic words from beavis.......FIRE!!!!
Yeah! Yeah!
@@0004612 😂😂😂😂
Just my opinion of the 383 , I will have to say that if taken care of and maintained properly in the way that it should be, no skimping or saving a buck or two, it is the best that Chrysler motor division ever made. Can be mad to run as good as anything else except for a 426 Hemi or wedge case. Good morning to you all and enjoy your day today.
Another great trip down OMG no shoulder, blind drive ways, and trees in the way road!
They’re not in the waaaay… they only become in the way if you decide to quickly try out that nonexistent shoulder. Haha.
I thought shooting flames was a factory option for 68 😄😄😄
69 only 🤣🤣💨
I don't know what number Edelbrock Performer carb you have, but my 1413 800cfm was not close to right, out of the box. I went with tune #21, 1433 jets and 1454 rods. Really helped my 401FE Ford with a 286 292/ 560 lift Howards Cams hydraulic roller.
This was an AVS2, and it was pretty dang good as sold.
I lost my DADGUM '78 Dodge Magnum XE due to a nasty carburetor fire 🔥!!! I was so hurt when that fire got out of control!!! My '74 Roadrunner caught fire while driving, I detected that one, didn't want Deja Vue!!! Mopar Nate Philadelphia, Pennsylvania
Ouch… I’ve had two almost big ones - one on my ‘66 Charger, and one on a ‘64 Wagon at Rocket. I was really afraid my ‘68 was trying to catch fire on a hot day a couple months ago… none of that is ideal.
@@DeadDodgeGarageAre ya'll carrying?
(Fire extinguishers, I meant. 😉)
Lots better than it was- just needs some fine-tuning.
Another really nice car, I remember when seeing a nice B-bodies driving around was a normal, everyday thing.
I wish I did 😭 I missed most of the fun times. Oh well.
@@DeadDodgeGarageYou are making up for it, and we're lucky to be along for the ride 👍
Loved this vid, and loved this car- although not so much the color, but as you often say- Who cares 🙂 Thanks for sharing it with us Jamie.
I’d like mine to be blue, please 😃 or red would also be acceptable. Or black… or white, heck I don’t actually care now that I think about it.
@@DeadDodgeGarage LOL...yeah, I guess I'd have to agree as well 🙂
F5 green? Come on 🙂
Take the vacuum modulator hose off the modulator and use a small screwdriver in the tube on the modulator, turn it in an 1/8 of a turn and drive it. If it's not enough go in 1/8 turn increments.
…what vacuum modulator? This is a Mopar.
That gear ratio in the differential may have something to do with it. If it's 3.73-4.10 that big block will stick the tach up to redline in a heart beat, hence the need to go into second! Just a thought! I love this channel!😊👍
I believe this car had the same standard 3.23 that my Charger has. Seems to me the vast majority of B bodies do.
68 is my favorite year for RR.could the early shifting be valve body? I love the sound of a finely-tuned big block Mopar👍😎
Yes - definitely a hydraulic issue of some kind. Not my department currently - but I do need to learn some more about them.
What I love about my 68 it’s basic as it gets. No trunk panel trim, chrome all the way around the windows above the door no solid chrome pillar , it has ac and yes it’s a automatic 😌
Awesome! This one is definitely almost too fancy for a Roadrunner. The ‘68 my brother is piecing back together is a true stripper model, with no trim panel or other dress up items and pop out back windows. It sure doesn’t have AC - that’s way too luxurious!
Like that Roadrunner
Alot of times if the original trans was changed out during the cars life the replacement 727 will have the wrong governor assembly, and will seem to short shift. I had a 79 Chrysler 300. Had the numbers matching 360 E58 and HD torqueflite, with the higher rpm shift points. It worked perfectly, you'd do worse to try and shift it manually. Just leave it in drive and that Thermoquad made movie car chase soundtrack worthy sounds.
Hey, I own one of those!
I haven't watched the video yet, but just by the title (Back-firing through the carb, usually indicates that the plug wires are crossed on a cylinder or two, or that the camshaft is wiped and it needs a rebuild. Now, on to the video.
Great ideas. I checked all those things - and many more.
Awesome
Nice
Nice.
Another great repair! Another great video! But the real question is... Did you celebrate with a corn dog?
Not on this day, but on many days 😃
I had a 68 plymouth 383 as my first car at 16, always jammed 1st gear up to 50 then hit second, we tortured that car and sold it to a friend who destroyed it, at the end the engine was still running when he took it to junkyard, should of pulled that engine to save.
Definitely… 383s are awesome engines. This reminds me though, my brother had a Duster that we put a 273 in for some reason. It had a 904 transmission, and second gear just kinda wasn’t there. So we would jam it in first and run it up to 45-50, then bang it all the way into drive. The little 273 sure sounded good when it was screaming. Haha.
Put an Edelbrock AVS on my Coronet you can have that crappy Thermoquad. I saw that car up close she is sweet. Sexy. Perfect marriage of form and function . I really like the color too. Probably hard to keep her looking clean if you're a semi greasemonkey though. Nice vid.
I don’t think I should be trusted with a shiny white car… let alone shiny white interior. For some reason I own one though. Whoops… hey, the Thermoquad can be good! When it’s not puking gas inside the engine, outside the engine, etc…
2:12 mark Oh Rodchester!! I have a 302 Cougar with a burnt hood to prove it. Just out of the blue one day.
A great subject for a video would be correctly adjusting those late 60's kickdown rods so the transmission actually goes into passing gear.
Yes! It’s on my list!
@@DeadDodgeGarage Thanks!
BETTER CHANGE THAT THROTTLE SPRING!!!😆
Nice, nice 😅
Not sure what his talking about a park throttle kick down, I had 69 RR 383 in the mid 70s to late 80s and it would kick down to passing gear at any speed. This car seems like slouch mine would pull like a freight train until about 85 or 90, then you could feel the power pull drop off and climb slower, but thats to be expected with a 3:23 rear and 3 speed Auto trans.
Part throttle kickdown is a feature that was added around ‘70 or ‘71, I don’t remember exactly. The earlier transmissions will not kick down into passing gear unless you literally floor the throttle. The later ones will downshift without as much throttle input.
Yeah Jamie 1971 part throttle kickdown anything before that old boat
Yep
Please record and post the content of fixing the kick down issue! Im having the same issue in mine! Trans was just rebuilt and manually shifts great but wont in auto!
I won’t be fixing it on this car, but I will be doing a video on kickdown setup and adjustment! I have a video on a green 1966 Dodge Dart that goes into it a little further, and shows the process of installing and adjusting a kickdown cable conversion kit.
Meep meep 😎
If I had your knowledge I would be dangerous.
I… might be dangerous 👀 do what I do - watch everyone else and steal their knowledge… you’ll get there. Haha.
1969 Roadrunner grill is not plastic, its metal but different design
Thanks. Total guess on my part. I’ve literally never seen one in person… the ‘70 grille of course is plastic.
Good video. Elaborate on the torque flight 1-2 burnout thing. I have heard about that but never understood why
Never had an issue when left it in drive..Did hundreds of burnouts over the years,but never say never.Ford/GM also blew transmissions doing burnouts so happens it everything if you do it enough..
@mypronouniswtf5559 same here. Just trying to understand the problem. I thought it explodes the planetary
When left in drive, the low / reverse band is not in play, which can apparently lead to the rear sprag exploding. The rear sprag is a common failure point in the Torqueflite. Been there, sploded that… and it took the rear drum with it. Ouch. So in manual low, the band is applied, which takes some of the load off of the sprag. It is advised to do burnouts in first gear to save the transmission. However, apparently letting off in first gear can *also* explode the rear sprag, so it is advisable to shift to second first. If you’ve got enough horsepower, you can continue your burnout in second anyway. Haha. I have broken Torqueflites several times over the years, and have learned this from people who’ve been around. But that doesn’t mean it’s gospel.
@DeadDodgeGarage good explanation. I have been around late 60s mopars but never owned one. My friend has several. And his boy has hundreds. Literally. The only one I own besides 2 m37's is a 1989 pickup with a cummins and a 727 and I didn't want to kill it with stupidity. Thanks for taking the time and explaining.
👍
That car has a whole lot of goofy things going on. Half generic under hood hardware and parts, the rest 'OE resto' style repro parts. That looked like a parts store coil. Why would anybody buy resto carbon core plug wires? At least get the Monel wires for a performance application. And the kooky valve cover load spreaders under the bolts. First thing that caught my eye was the white painted pentastar on the pass. fender. That tells the tale of the level of detail right there. I'd expect that from Maaco.
BTW, I had a couple of those Carter 750 AFB Comp series I bought crazy cheap when Federal Mogul disco'd them around 23 years ago. They were OK but nothing like the AVS2. I took one off my 383 Magnum '70 Dodge Powerwagon and got the AVS2. It was like night and day. I bought a tuning kit but it was right on straight out of the box.
Yes it’s far from a “restored” car. There are a lot of little things that are not factory correct, but over all it’s a fair approximation. I mean, it’s got a wrong year air grabber. How correct could it really be? It’s just a really nice driver quality car. I was waiting for someone to notice the Pentastar - somehow no one else had yet. That’s definitely not ideal. The AVS2 is awesome. Honestly, the more modern Edelbrock carbs before these have proven themselves to be quite good out of the box too. That competition series carb is just a serious fuel toilet. Fat is safe, right? Lol.
@@DeadDodgeGarage Yes, that AVS2 is incredible! I literally bolted it on and it was nearly spot on. I think I adjusted the idles maybe 1/4-1/2 out. That's it. Felt like FI compared to the old carb. I bought mine in '18 right after they came out and the 650 was the biggest.
Yeah, that Runner's nice, just needs detailed and un-cobbled a little bit. Happens to all the cars I buy 'somebody else' built.
Funny story. A long time ago I looked at a 'fat' Mustang, a '71 or '73 Mach 1 from a 'broker' or 'flipper'. Decently nice car. When I opened the door looking at the headliner I couldn't see the dome light. Then I felt up there and the shop they took it to just put the headliner right over it. I pointed it out to the owner of the dealer and he just said 'Those guys!' I left. I think I was looking at a Mopar there and happened to check out the 'Stang.
They painted over the gold Pentastar, 00:44.
We know. I almost said something… but I thought I’d leave it as an Easter egg. You’re the third or fourth person to notice and say so. Again, it ain’t no perfect restoration. It’s a great driver!
You have and exaust valve not opening either a cam lobe is rounded off or rocker is worn an has a large hole in it .
No. It had fouled spark plugs. After working through the fuel and other ignition system issues, I replaced the plugs, and it ran *perfectly*. I thought it may be something like that as well.
What was wrong with the alignment. .2° positive camber and negative . 4° caster is perfect. It allows for road crown and driveability. If anything I would want it to be over 2 1/2° on both sides just for a more smoother drive, but that's more for 70's era cars
The widely circulated updated specs for modern radial tires call for 2 degrees of caster or more. We have shot for that extra caster for years. It really helps the front end feel more stabile and tend to return to straight ahead. Again, it’s fine. Perfectly acceptable. This ain’t no handling car.
Basically that's what I said. Lol. Kids these days. Hahahaha
Passing gear linkage needs a spring attached to it. It must be all the way forward. 🤨
We refer to that as a kickdown linkage, but it’s actually the transmission throttle valve control. And… there’s definitely a spring on it.
@@DeadDodgeGarage I'm not PC, but I didn't see a light duty spring attached to the Thing-a-ma-jig!
I would rather have it that way with a four speed. As good as it gets 😊
Agreed
@@DeadDodgeGarage I wish you could have met my Uncle Joe for he was a Marine and he was in the battles of Iwo Jima and Okinawa and he made it home and he was wounded and sent back out. Ended up going to Korea and was in some key skirmishes there also. Made it home safely and went to town one day and was walking home and was about 300 yards from the house and a drunk driver hit and killed him it was such a tragedy and goes to show that no matter what and how good the soldier is 🪖💪 the Lord's hand has been the final day. He must have needed him for a great reason to make him go to the house upstairs and needed him very much for him to get him so young 🌱. God bless you and your sharing this with me and my family. Thank you again for your time, work and help with the channel and content is great 👍😎
It’s the GM battery the Mopar is rejecting it…😬
😅
put lighter weights in the governor and might fix the 1-2
I need help to understand! The Carter Carb must have worked correctly at one time. Could it be repaired to work like it should? I understand putting on a newer model that works better but if I owned it I’d want to keep it as original as possible.
That carb wasn't original, it was a performance series carb from the 70s with the wrong throttle setup. If it was original, we would have left it there. I spent way too much time taking it apart to change out those fire hose main jets for a standard sized jet, which made only a small improvement. I could've wasted some more hours figuring out the other calibration differences and gutting a donor carb for parts... or we could spend a similar amount of dough on a new AVS2 that works great out of the box, has the modern boosters that work very well, and has the right throttle attachment for the Chrysler adapter. Pretty easy choice there.
@@DeadDodgeGarage I’m not being critical and understand modern carbs are much better than those from the 60’s-70’s. It still a little mind blowing to me that with all those carbs Carter made they went out of business in the 80’s. I went on the internet and saw the old Carter factory. I read somewhere the site is going to cost millions to clean up.
Finish Torqueflite burnouts in HIGH (3rd) to be safe!!
3rd? Is there science behind this? Or just fun? Haha. Leaving it in forced first when letting off can apparently lunch the rear sprag. I’ve done that, but in a different, more exciting way…
4- Speed or no speed. My dealer special " Belvedere " post not Satellite literally jumped off the ground before it tried to pin you in to the back seat. The absolute car I should have never ever sold 😢 young dumb and there was that divorce thing. That was really DUMB.
68 or 69 Belvedere?
Interesting. I’ve launched a hemi four speed Challenger with a little gusto and it sure didn’t pop Coke cans. Ditto the 440 4 speed R/T Charger with nitrous - fast, cool, and enough torque to have bent the driver seat over the years - but no sweet jumps. The four speed is great fun, and in a car like this it would be my preference. But in a car like my Charger, I love the get in and cruise aspect of the column shifted automatic. It’s great.
😂
@@scottsmith8294 1969 and the Dealer special was a (RINGER) as they used to say. Owner of the old California Custom auto repair that used to be 92nd and Aurora N. Was the person that told me when I asked about all the body warping down the sides. This was due to acid dipping . Motor was tricked up to 400hp 383 single 4spd with 4.2 possi. Top speed 89mph at 6200rpm on freeway.
Belvedere post flat taillights bench seat no radio. Promo car for Run on Sunday SELL ON MONDAY dealership only and was Not useable for NHRA events. They were banned back then. And I out ran 396 SS CHEVELL'S on the streets. Street legend kinda thing. Fun times. 1975 N. Seattle.
Beep Beep
Should I check if my socks are matched ?
Your call 😅
I think the 69 Grill is aluminum.
Sounds right but I’m not totally sure there.
I never drove any car a quarter mile anywhere ..... 4eleven gears would never win from Seattle to Winnemucca.
A quarter mile car should be called a DashHound and a long ranger The RoadRunner. RoadRunners and SuperBee's are definitely upper crust in my book.
Hmm, that would explain why i can't perform a burnout in my 69 Roadrunner when in drive. How would I know if anything in the transmission was damaged 🤔
Well, no, it should still *do* a burnout… it’s just not really good for it.
@@DeadDodgeGarage
Well that's not good to hear, back to the drawing board 😕
Maybe you have a manual valve body and when in drive you are actually in third gear(?)
@@mickangio16
Is there a way to determine this? It is a column automatic, but I bought it used and I'm pretty sure that the transmission isn't original. Where would this manual valve body be located?
Is the pentastar painted over at :43? ??
Yes, yes it is… we noticed that too.
@@DeadDodgeGarage I saw the shock tops painted over too so I knew it was so. 😀
Why did you change the carb out again?
Because that old Carter Competition just wasn’t a good fit. I had dropped jet sizes significantly, tried the closest needles we had to what it wanted, changed springs for the right size, and no matter what I did, it still wasn’t ideal. It was much better but not perfect. Compared to the additional amount of time I could’ve spent working it over, The AVS2 was in the budget, and worked great right out of the box. They are a great carb. The throttle linkage on the old Carter was also goofy. AVS2 and adapter worked out great.
Cool, wondering how much problem that going to be with my factory Carter avs I had restored, it had a Carter afb I think is what’s it’s called on it when I got the car and putting the correct avs back on, the kick down linkage on mine wasn’t working on it at all and the car would only shift back into first when you would come to a complete stop…..I could tell some of return springs on the throttle were wrong too…..
You think the value of Road runners will stay upwards. Or start to drop
Hmmm… great question. I think they will be desirable for a long time. I don’t think they have the same appeal as the Charger with young people (thanks to movies, mostly,) and I don’t know if they will stay inside the “almost-a-Charger” bubble forever. Currently, all B-bodies from that 68-70 era seem to be commanding really high prices. And there is a lot to love about the Roadrunner that makes it unique and cool in its own right. But it’s a bubble - and sooner or later, it will burst.
@@DeadDodgeGarage what you think of the 73 74 model Road runner
Too bad it's a column shift
Why is that too bad, exactly? It’s a Roadrunner… that’s like the essence of the Roadrunner - cheap, no frills. Sure, a four speed would be cool.
Timing
That’s what I thought. Nope.
I'd bet somewhere between the carb and the trans is an incorrect/damaged part in the kickdown linkage.
Linkage has been verified to be correct, now adjusted properly, and does kick down into second gear (verified after final adjustment, after filming the video) so we are pretty sure it is an internal hydraulic problem. Whatever it is, it’s something we have seen on multiple cars, and we would like to get to the bottom of it.