Need help with rough idle
EVAP purge valve possibly? Do you have a scanner that you can connect to and check live data?
Reason I say EVAP purge valve, I read they can become stuck open and essentially flood the engine with fuel vapor, car will run rough/rich until it clears out and then will be smooth again. Live data will show more than normal negative fuel trims during this time.
Reason I say EVAP purge valve, I read they can become stuck open and essentially flood the engine with fuel vapor, car will run rough/rich until it clears out and then will be smooth again. Live data will show more than normal negative fuel trims during this time.
With a bidirectional scanner there's an option to open and close purge valve 0-100% watch your trims as you open it. If the purge valve is functioning as it should you'll see trims go negative as the engine trying to reduce fuel since it's sensing rich mixture. Or just watch your trims when the truck is running rough, that could be a good clue to rule out common possibilities.
Now check air.
Test the MAF sensor>>> Unplugging Method (Quick Test): With the engine running, disconnect the electrical connector from the MAF sensor. If the engine stalls or changes idle significantly, the sensor is likely working. If there is no change in behavior, it is likely bad.
You got fuel.
Now check air.
Test the MAF sensor>>> Unplugging Method (Quick Test): With the engine running, disconnect the electrical connector from the MAF sensor. If the engine stalls or changes idle significantly, the sensor is likely working. If there is no change in behavior, it is likely bad.
Now check air.
Test the MAF sensor>>> Unplugging Method (Quick Test): With the engine running, disconnect the electrical connector from the MAF sensor. If the engine stalls or changes idle significantly, the sensor is likely working. If there is no change in behavior, it is likely bad.
I did that was one of the tests that I did and I also installed a new maf . It’s working properly
no I have aftermarket intake . But didn’t have a problem before with it. I Also did a smoke vacuum test to see if there is any leak and there was none . I have new Tempreture sensor installed also because I thought that may be bad but it wasn’t
Answer previous question>>>What temp does your scanner show at startup?
oh come on I had that Intake for years and no problem, when I checked now the temp at startup it was 80F


