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By Michael Henrich
I have an '02 Sierra 1500, 4WD, Canadian built, 4.8L V8. It starts perfectly every morning and I have no issues while the engine is running. After the first start if i turn the engine off for more than 10 minutes I have a rough start and get intense fumes in the cab. If it's off for 10 mins or less it starts up without issue. Within the past 8 months I have replaced:
All four O2 sensors
Spark plugs & wires
I'm not getting a check engine light and a code reader comes up empty. Any suggestions?
By scott willman
Okay I have a random misfire code 300 302 304 307 replaced already o2 bank 1 upstream and down stream,new plugs,new wires,new coils, new injectors,maf and map, truck will idle fine then it won’t,check engine light will blink and then stay on,if it’s idling ruff and I take off it stumbles till I hit 25 or 30 mph and then I punch it and it runs fine for an hour down the freeway, then when I stop it may idle ruff or fine what is going on with this truck and it has a lot of power,help......gas engine no flex fuel
By RapidRam towinthecoast
I HAVE A '13 SILVERADO HD WITH THE 6.0 VORTEC. RUNS LIKE A CHAMP, PULLS LIKE A CHAMP. BUT, I RUN A CLUTCH PUMP ON THE MOTOR TO POWER MY LIFT IN THE BED, AND I DESPERATELY NEED TO INCREASE MY IDLE. IT IDLES AT 600ISH NOW, AND I REALLY NEED 700 OR 800. WHAT OR HOW IS THE BEST WAY TO ACHIEVE THIS??
THANKS IN ADVANCE!
I installed a new 6.0 motor with high volume oil pump on my 2008 6.0 LTZ suburban. It has only 500 miles on it at the moment as of 9-5-2019. I installed a new intake, new throttle body, (relearned) new radiator, new plugs, wires, injectors, fuel pump and new heavy duty motor mounts, I have this slight shake at idle and you can feel it in the performance of the truck when driving down the freeway as if something is holding it back, Its not throwing any codes, engine light is not coming on. Had a guy that all he does is reprogram cars and trucks with his computers and when he hooked his high dollar stuff to the truck, the rpm went to zero while it was running and said it was a cam position sensor but when he disconnected it it went back to normal. my regular mechanic hooked up his diagnostic computer (Zuess) right after and it had no codes and we cant find out what is up. Maybe the guys high dollar stuff was messed up. Some guys are saying its the trucks computer but its not showing any codes, it runs fine but it should be absolutely purring like a kitty cat and there should not even be the slightest movement. The guy with the computers said that it has the fuel efficiency program on it that drops to 4 cylinders from 8 to save on fuel, he said the system was on and asked if I wanted it turned off for 250.00. I didn't do it. something is up and its driving me nuts. anybody have an idea at all? the #1 cylinder failed on the original motor and the traction control code came on and said it needed to be serviced. After the motor was replaced it did not come on again and there was no code for it as well. just for some history. Please help
By Chris Lee
Just replaced e driver side engine mount. After the install, my idle/park started rough idling specially it has more vibration and noise during Reverse. Any idea what could cause this?
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