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I've got a 2014 GMC Sierra L83 single cab... I recently decided its time I start getting some performance out of my truck.
L86 Thottle body and intake manifold
1 7/8 header + full 3 inch exhaust (magnaflow muffler)
Stage 2 GPI cam kit + DOD Delete
Transmission Oil cooler
I had the car dyno tuned and everything went perfect. We later had a few trial runs on the street and hit issues with sort of a misfire at specific rpms and gears... 2nd gear at 4,200ish rpm it would have a slight nudge and again at 5,200ish another drop and kick. It would happen almost all the time.
We thought it would be the spark plug cables, went and got MSD plug cables added those, tried again, same thing! Spark plugs are new, fuel injectors are serviced with zero issues... the car ran perfectly before we did all of this...
The tuner now tried raising the oil pressure in the transmission thinking its a gear slippage due to the oil pressure. Tried again, same thing!! We've ruled out alot of the problems, now theyre saying that its the disc thats slipping in the transmission which would make sense but I want to get ideas as I'm spending money trying to fix the issues that we're not a 100% sure about. Can you guys let me know if anyone went through anything remotely similar or if you have any views on the matter.
By Brandon Allen
Question fellas And ladies, I typically don't post on forums, but I'm at a poss currently. My truck is 2010 Silverado 4.8 and after driving it for 30 or so minutes the traction control/ stabitrax light comes on, the tachometer cuts off and the truck feels like it's jerking going forward, if I'm stopping or stopped the truck stalls and won't turn back on for Maybe an hour. I've replaced the fuel pump, crankshaft position sensor, engine temperature sensor, replaced the plugs and wires maybe a year ago, and I don't drive it much because I live close to work. Yesterday I had been driving it a little farther because I thought it was fixed, but as I was getting on the highway, the truck popped/ jerked, and the stabitrax/traction control off displayed and a couple of seconds later, the tachometer went to zero. I was able to get her home, but the truck kept jerking all the way home. I think the problem is unrelated, but my oil pressure has been getting lower as I drive it. Any help would be great, thanks.
By Cory G
So I ride a 18 Sierra 1500 with the 5.3L and keep getting gas in my oil, my high pressure fuel pump let go in March of 2019 (40000kms ish) and was the first time I got gas in the oil, they replaced it and it was good until late December of 2019, I drove 800 kms to home, parked at the restaurant and went to go home and got a bunch of codes, saying that bank was to lean, bank 1 to rich, bank 2 to lean, bank 2 to rich and a open circuit fault code. The truck was in limp mode but got it to the dealership, they found a short to a relay for the hp fuel pump and my crank case filled with gas (same as the last time but now the truck at 69000kms) they tested the O2’s, fuel injectors, injector cycles and such, they all passed the test so they figured the hp fuel pump went, so they replaced it. I then drove not even 3000kms and my truck was doing 33L/100kms downhill at 104km/h, no codes or engine lights. Checked the oil and it was over filled and smelled of gas, brought into the dealership and they said the Intake tube after the MAF was loose causing the engine to over fuel, now not even 2000kms (3 weeks) into the dealership “fixing” the issue, my oil is over filled and smells strong like gasoline. Any ideas on what the issue could be? I don’t want to keep paying for an oil change every 2-3000kms and 100$ deductible for my extended warranty. I know it’s not healthy for the engine and GM Canada won’t do anything about it.. Any ideas as to what the issue might be would be awesome, thanks
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