GM Truck REDUCED POWER P1515: EPIC BATTLE! - Part 1
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- čas přidán 5. 08. 2020
- Just a run-of-the-mill Chevy truck with a Reduced Engine Power complaint.
Engine DTC P1515: Throttle Performance.
How hard can it be to diagnose?
However the owner also wants a PERMANENT solution.
Can we trust Reman parts?
Enjoy the battle!
Ivan - Auta a dopravní prostředky
You've got me hooked, can't wait to see part 2 !!!
Parts 2 AND 3? Oh boy. Gotta be a "Chevy trucks in the Salt Belt" thing.
Between u n south main auto 👍
U welcome maybe one day ill drop off both my cars easy peasy for u 57 chevy n a 63 impala ss
Looking forward to the rest of it. Love seeing your thought process. 😊👍🏻
Thxs Ivan,I love your follow up at the end of your repairs.....
Thank you Ivan. Good job again. Have a blessed and safe week to you and your family.
Never rule out a part because it’s new! It will burn you if you trust your aftermarket parts
YEAH! Another Ivan video!
If anybody can make it cry “Uncle” it will be Ivan!
Thanks for the video Ivan. I have an 02 with the 8100 also and it has been a great truck.
Interesting. I see a scope coming out in the future. Thanks Ivan!
Great case study Ivan.
Around here you don't get a warranty on the diag/repair of intermittent problems. That means every car is a money pit.
I was first thinking the butterfly position feedback connection was nasty, and causing the computer to drive the motor wrongly.
But you did say later that the owner had cleaned and added earths so that was a no no lol.
The new but faulty throttle body created mayhem and he next replaced the throttle peddle, i bet that has a fault in the matched pots.
I would put both original parts back and see what happens.
It's an interesting fault anyway :-D
Ivan,
I dont know anything about these trucks but it is an interesting case study. Great video and I look forward to part 2.
God bless
Paul (in MA)
Your persistence on finding an issue is why I’m subscribed to your channel. Good stuff brother, love your videos. Keep’m coming
Thanks for the kind words Fran!
THE SUSPENSE!!!!! Great case study so far! But they can’t all be that easy right! Ivan, thank you for putting these videos together. Looking forward to next ones!
Thanks for the comment Angel! Glad you enjoy the vids and the SUSPENSE ;)
This is why I own a small engine repair business and not an auto repair shop........
I hope he saved the box on that Cardone throttle body so he can get his money back!
26:15 One of these days you will be saying "His problems are not over as you'll see in parts 2-7"
Good video on what could have been a run-of-the-mill repair. So down the rabbit hole we go. I used to work for the phone company. One of the reminders that...... if you need to complete to work done by a previous tech, you almost need to re-track their work at every point or face a question of errors. Looking forward to the follow-up. Watching you with that SNAP-ON is bringing me into a new world of diagnosis benefits, for an old tech. Thanks J K
Looking forward to part 2👍
I haven't heard the term "wiggle test" since I was at Ford.😂
great job Ivan
So he got that throttle body from Napper, not a sponsor.
As Eric O would say ....
Thank you for doing this . I had a bad throttle body and could not find one period. This worked just as you said, and I'm on the road again. Without people like you , my truck would still be parked .Thx again
Glad it worked for you! Chevy Trucks are solid!
Lay on the science, brother Ivan!
I had an issue like this on my 6.0 Hummer H2, and found a wire that had broken insulation, and my heater core hoses were leaking coolant onto the broken wire that lead to the TPS. As soon as I cleaned and put electrical tape on the wire, I’ve never gotten engine power reduced again. Nice video !
My goodness! What a bear!!! I’m goin through the same problem. Not as savvy as you. And do not have a Varys. I just wanted to pat you on the back for staying on it and figuring it out! God for you, and thanks for teaching us! All the best!
Awesome Sir
Something that an instructor said with great importance to me years ago is that when it comes to electronic throttle stuff, OEM parts only with absolutely no exceptions. The throttle body on a gas engine is the primary means of modulating the engine output and while there is some redundancy and the ECM could reduce engine power through other means if the throttle were to fail wide open, how long could that take and what could happen in the meantime? The whole debacle with Toyota and the throttle pedal getting stuck under the floormat shows that you definitely can't count on the driver of the vehicle to react in any sort of intelligent way if the vehicle accelerates on its own. Far too much liability to try and save a buck, use OEM electronic throttle parts only with no exceptions.
They were OEM parts. However the "reman" parts are always highly suspect in my book, and new TB is discontinued for this model.
Not many of those 8.1 around anymore.
People couldn’t afford to buy the gas for them........
Well, Ivan.. . This never was a ordinary case study in any of your videos. As there's always something mind blowing thing that you didn't expect to find or get!! Now that's cliffhanger on part 1, come on part 2, lol. Gotta find out what happened next!!! Hahahahaha! Nice video!
Yeah this wasn't a "virgin" truck haha
I admit I was wondering about powers and grounds
I see this scenario in my work too. In an overall system with multiple constituent parts, during "troubleshooting" a good part gets swapped out for an unknowingly bad one, then the actually bad part is replaced and an issue remains. The remaining issue may be similar symptomatically as here. Eventually the "troubleshooting" ends when there are no constituent parts left to be swapped, human nature being to assume that new parts are known good so are not revisited.
I always get a slight chill when I get a call out sent to me that details a whole list of what the customer has tried followed by a history of various other techs having attended and condemning one thing or another each time.
Depending on the complexity of the overall system, when given this scenario to sort out I either;
A. Put all the original parts back in then diagnose the original fault that triggered the chain of tears.
B. Reverse out the various changes and parts one by one until I see a change in some parameter - then have an avenue to explore. But still keep new parts remaining in the system as suspect in my head until proved otherwise.
Either way it is usually very time consuming to handle an issue that has been "touched" by multiple people and had many parts thrown at it. In a small part because the customer's description of what the original issue was is by this point largely irrelevant - in reality you are no longer dealing with the original issue.
It is fun unpicking these things though. If it were simple I wouldn't be there :D
If you have 8 cylinders displacing more than a liter each, reduced power shouldn't even be a concern, there must have been too plenty to begin with!
Ivan I am waiting for part two and three. You never seem to luck out. Maybe stick with scissor jacks Lol 😂 anyway good video see you on the flip side. You and wife stay well and safe Artie 😊
It’s not fair Ivan. You already know how it ends before we do. Something tells me you did eventually figure it out. Am anxious to see what you found.
This has got to be the most horrific problem to get on a GM product. We had one we battled that would never recreate the problem when we drove it but a rough road would trigger the problem but a restart would cure it till the next time. Looking forward to part 2 and 3 though i doubt you were. :) SMA had one where an accessory was pulling down the voltage and causing issues.
I have faith in our hero
Lol good comment
We had a service kit to replace the throttle position sensors and then we had to update flash the computer and relearn the idle. Is this same for you? Who knows..
Thanks
Nice class. I get nervous when I see you recording while driving.
Here's an idea for all you engineers...
Have a cable run between the gas pedal and the throttle body.
Sure would eliminate issues or complications caused by motors, potentiometers or wiring.
KISS!
A six foot long mechanical cable isn't as sexy and marketable as three sensors, a computer, 5 connectors and 200 feet of wiring. Plus it can be diagnosed and repaired cheaply by anyone who can use basic hand tools, cleaner and lubricant. Same goes for speedometers and cruise control.
Cascading complexity upon poor basic design decisions is why the real cost of cars has increased while their functionality as transportation has not. When you sell bigger, plusher and sexier instead of just big enough, just comfortable enough to use and reliable, you encourage unnecessary use, get car commuters, traffic and global issues like bad air.The increase cost just aggravates everything.
@@psdaengr911 I'm 68 years old. I've had lots of cars, some cool & sexy, some fairly pedestrian.
I've never broke a throttle or detent cable. I have sometimes lubed them with my handy motorcycle cable oiler. I don't expect cars be as easy to repair as say, a '64 Falcon (with a 200 in line 6) but when I do buy a car, I look for ease of repair. I would never buy any vehicle that use "drive by wire".
@@hatfez You'll really gonna have a hard time to pick your next vehicle then ..🤪
@@juergenscholl2843 I'll lease a car. What the heck, I don't work, so I just drive a few miles now!
Nice !
Keep giving her!!!!
I have a 2004 Silverado 2500 HD 6.0L 4WD 215K miles with a backseat full of the same parts as in the video. We love our truck but can't keep it on the road. Replace a part based on a code and it works great for 3-4 months and then repeat. Hope to learn something from these videos - thanks for making them.
Mobil Exxon loved these 8.1
Intermittent GM throttle issues can be the worst. Sometimes they’ll never act up the whole time you have the vehicle. They have issues with everything on their trucks from the APP sensor to the throttle body and every connector in between. There is nothing more frustrating than to look at everything on a scope in every situation imaginable only for it to never act up and then within a day of turning the car back over its back. It doesn’t help that most of the time it’s been to a dealer at some point and they’ve smeared every connector with dielectric grease like it’s some kind of contact enhancer 🙄
I had a similar issue with e250 ford van. A shop put a motor in and left the harness laying wherever it was left after install. It wasn't secured properly The fan nicked the ground wire with such precision it didn't show damage to the loom upon a look over. It was only held together by 2 strands of wire. It was enough to light a led test light but not a headlight. That's were the shop messed up (led). I'm not a fan of led test lights. I've seen them light just with a corrosion connection.
Yup for powers and grounds you need at least an Amp of load from a light bulb :)
Had the same issue with a van.. waiting to see what u find
Dang man, the timing on this one. I own an 04 2500hd with the 8.1L as well and I wasn't happy about electronic throttle when I got it.. And we are also battling an intermittent reduced engine power on a Grand Prix in the shop this week.. takes 25 miles of driving to act up all other times everything looks perfect. Right now we're stumped but I will look into the grounds, couldn't hurt.
Heat and vibration, heat and vibration, heat and vibration... ;)
Just hope the Grand Prix is throwing a code or two to give you direction, otherwise, strap in, brotha!
@@rhkips yes sir, got a p2128 and p1125, so we do have some direction!
i had a similar problem on renault clio 2002 y. there was a bundle of wires going from the fuse box in the engine compartment to other parts of the car. by stretching and moving the individual wires in the bundle I rectified the fault. I never searched for or found which wire was causing the problem. a year later the car was still working normally ... and then I sold it :)
Was already typing about checking for bad grounds before video got to the end, haha. Guess I will speculative with a connection problem, but then again hard to say with so many parts that have been changed in the past.
This... pinched wire, bad ground or got two wired flipped which aren’t initially cause of conflict but become one. I’d be rip out the wiring changes that were made by customer/for customer and redo it by the book.
I know made that mistake a few times adding features to my car that i initially opted out of from factory. Couldn’t for life of my work out what was wrong everything was happy with diagnostic module checks all communicating fine until car was running for a few minutes and even initially works after start up but then quickly got buggy. Turns out flipped two of can bus networks across each other so like can bus1 + was wired to canbus2 + wire and vise versus and was causing odd communication patterns only when things were all running all together bugged it. And I spent hours on locating the fault and using wiring diagrams and wasn’t till I ripped out all wiring that i added and redid it that it was obvious i flipped two wires around.
Anyone know who made the oem throttle bodies ?
Id like to no how you change for your guaranteed fix or no charge.
The body ground on the firewall seems, odd. The braided ground strap is fine, but that heavy battery ground cable looks out of place there. Just wondering...
All of this could be avoided by having a real throttle cable from your foot to the throttle body. I miss the old ways.
See you in part 2 Ivan!
Missing troubleshooting step (19:00): Move the connection back onto the mounted (NAPA) TB and retest. The contacts could have had oxidation that was scraped off by unplugging and replugging the connector, or a slightly out of spec (bent or undersized) contact.
I did off camera. The installed TB was garbage haha
Like #459
Thanks for the video!
Please help I have a 2003 Chevrolet suburban had my rear main seal fixed and now my truck goes into reduced engine power never had this problem until my rear main seal got fixed by my son and his friend could it be a wire or do I start throwing parts at it the code I'm getting is p1516
Some strategically placed resistors might skew the readings just enough...
Oh boy, the dreaded code.
Hey how u doing how can I get u to do some electrical work on my 2015 impala
5:00 I've not seen the rest of the video yet, but based on the code and parts canon, my bet it on the power or ground to the throttle controller, resulting in insufficient torque to open and/or close the throttle, while the TPS works fine (otherwise it would set a correlation code).
this guy saved me
"He replaced it with something from AutoZone, hahahaha" 😂
A+ good job more ice crean with nuts
Chip should sell that POS 8.1L.
To me. After you fix it...
What will you guys be driving if / when fuel cost meets the likes of Europe 8.1L I don't think so 😀
sounds like the TB. isn't playing nice or bad plug/wire harness issue to it/TPS.
but wait, was it showing as shifted into gear (4th/OD) and calling for 2ND gear physically, without running? now I'm starting to wonder about some wacky ignition switch problem or power/ground issues. there's certainly some wiring ghosts/gremlins hiding somewhere in there.
Good
I had an issue like that on my car I was losing throttle response push the gas pedal and nothing car just lose power and die out. So I replaced the TPS and that made the problem worse found out the original TPS was fine and the new one was causing more problems so I put the original back in and it was actually a combination of the MAP IAT and IAC replaced all those car runs great now wasn’t the TPS at all but the new TPS part for some reason made it worse. So you can imagine I was baffled for a while trying to figure this out
Yup need a good scanner with live data to see what all the sensors are reading before loading up the parts cannon :)
Damn this guy is good,
as a 27 year ase certified tech, aftermarket electrical anything sucks!
Parts 2 AND!!! 3?
This is what happens when you go from a throttle cable to a computer controlled throttle system. So much for technology.
Especially when GM is implementing the technology. They'll either stick with something a decade longer after it should have gone away, or implement something way too early. Electronic throttle is solid stuff now, but that far back it had teething problems. I never had actual problems in an 05 Toyota with electronic throttle, but to call it unrefined would be an understatement.
I never had any issues with electronic control fly by wire throttle on my Volvo wagon and I’m nearing 300,000 miles.
@@Honeypot-x9s early Volvos actually have a common issue of TPS going bad. I guess you got lucky. If it does go out on you, xemodex rebuilds them with a solid-state TPS that never goes bad again.
Keith MacDonald that’s possible I’m lucky or that Volvo solved the issue, my Car isn’t really terribly old though, P3 platform and it’s a 2011 XC70. I beat the shit out of my wagon, drive it like I stole it as they every day i red line it a few times and many times I get it sideways on the gravel roads and drive way. it genuinely given me no real issues ever almost all factory hardware.
@@Honeypot-x9s they may have gone solid state for P3. It's a known problem for P2s. I have an 06 XC70 on oversize all-terrains. Absolutely love it. Rust-free body after 14 Canadian winters.
why does PRNDL say 4th and current gear say 2 for Freeze frame. isn't tranny automatic? 6mins 30sec of video RPM was zero so I'm assuming truck wasn't running
Why was the PRNDL switch @ position 4 on your screen
I noticed that too! Not sure lol
Ok NOW DO MINE! I'LL SHIP IT TO YOU.
لدي مشكلةP0120. P2135 سوبر بان 2003
"Famous last words" lol
2 amp test light?? Test lights have a amperage rating?
Anything that draws current can be measured :)
Oh o , there is more .
Broken wire at the connector ? Or almost broken wire ?
I wiggled and pulled all the wires; didn't see any glitches.
i need part two, 2002 avalanche and im a freakin mirror image. pedal changed all pigtails changed tac module and used and reman throttle body and luv my truck but damn ready to sell.......
Perfect. You'll enjoy parts 2 and 3 :)
انا احب صيانة سيارت الشوفر ليت كل انواع الشوفر
I think I would put a disclaimer in before traveling 2 hours. Let the customer know that all windshield time will be billable.
I did for the first trip :)
Ivan: I hope i didn't fix it...... 🤔
Stop in at Harry's Auto parts.its a auto salvage,,Right in Hazelton,,,
You go out and pick parts,, Harry's u pick,, been there,well organized, pay a few bucks to go through the gate,,
Typing this at 7:12. I’m going to take a stab in the dark that it’s transition related.
It’s a Chevy, so the problem will be a loose brake light ground or some other stupid issue.
Lol my envoy was killing a charged battery in 5 seconds. Like cause a fire amounts of amps drawn. Found 3 bad grounds now its fine.
I just watched Knives Out and if you’ve seen it you will understand that that donut still has a hole.
OEM parts.......many dealer will sell the parts cheaper just to get rid of their stock piles.
Stay tuned for parts 2 and 3? Wow this one is a doozy. I hate electronic throttles, give me a mechanical cable any day over these things. Probably does have a ground issue or maybe corrosion in an inline connector somewhere.
Another Chevy mystery. Hmmm.
Wrong part ?
Eeek. Part 2 AND 3???
Dammm.
Interested to see the rest. A serious exercise with two more parts! Your earning your money...!!
The last fluttering throttle case was that Zenith Sky Jack video.
I prefer a steel cable connection any day, thanks.
haha yup good call! Never had a problem with a regular throttle cable :)