limp mode? boost/sensor issue...
#1
limp mode? boost/sensor issue...
ok so aparently my o1 audi a4 1.8t is running in limp mode and is peged at 5psi of boost... i have a full borla exhaust with a cat delete pipe. ive had the exhaust on for about 5 months with no issue. i have a kn air filter and a boost gague in as well. one day i was driving and my car wouldnt get above 5psi i thought it would be a vacume leak so i checked and found nothing. then i took the negitive off the battery and reset the computer and my car was acting normal untill about 50-100 mile down the road it gos back into limp mode. if you have ne idea what i can check to figure this out or any ideas whatsoever please let me know. also if you know how to check if the maf sensor is bad with a multimeter or the o2 sensors with a multimeter could u let me know so i can check them. any suggestions will be taken to heart thanks!
#5
Unplug it.
If the car runs better w/ the MAF unplugged then thats the problem. If it still runs like **** or runs worse than before, its somethin else. Any CELs? Codes? Keep in mind that you CAN throw codes w/o a CEL
If the car runs better w/ the MAF unplugged then thats the problem. If it still runs like **** or runs worse than before, its somethin else. Any CELs? Codes? Keep in mind that you CAN throw codes w/o a CEL
#7
Sounds like a fuel trim issue that could be caused by a bad MAF, as mentioned, or it could be a leak passed the MAF that is messing things up. A leak will allow air to enter passed the MAF and the MAF readings will be low but still accurate.
I wouldnt automatically assume its the MAF. I replaced it on my old car before I found a hole in a hose. '
Do a leak test.
I wouldnt automatically assume its the MAF. I replaced it on my old car before I found a hole in a hose. '
Do a leak test.
#8
Mine recently started as well and my MIL light came on. I took my OBDscanner to it and i got two codes.
1 - MAF sensor output too low
2 - Boost sensor one faulty.
any idea why these two codes would pop up and make my car stumble and spit and sputter?
1 - MAF sensor output too low
2 - Boost sensor one faulty.
any idea why these two codes would pop up and make my car stumble and spit and sputter?
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