Running smooth/several misfires

WRABC5749

MEMBER
2001 JEEP GRAND CHEROKEE
4.0L
6 CYL
4WD
AUTOMATIC
111,000 MILES

It is not missing or running rough at all and it does not use any gas either, but the check engine light keeps coming on! I have had it checked three different times now and each time they say multiple misfire on four out of six. I had spark plugs replaced, still have the check engine light, still multiple misfires. Had spark plugs and coil packs replaced, still multiple misfires and check light. Injectors are fine, what could it be?

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,536 POSTS

Hello,

This sounds like a problem with the MAF sensor. However, to be sure can you please give me the code numbers?

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

Please let us know. Cheers, Ken

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Sunday, May 6th, 2018 AT 1:10 PM

WRABC5749

MEMBER
2 POSTS

I had it checked at a car parts place and they did not give me the codes. They just said it was misfiring on four of the six. I did have the spark plugs changed and the same thing happened, then I had the spark plugs and coil packs changed and had the injectors checked and after driving a while it came back on. They said it was the same problem. I am taking it to different places so, I cannot imagine they all come up with the same thing. It is still running great, no missing or anything.

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Sunday, May 6th, 2018 AT 3:07 PM

KEN L

MASTER CERTIFIED MECHANIC
47,536 POSTS

Okay, then I am leaning toward the MAF sensor giving you the problem but the codes would be nice. Here is how to get them:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

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Monday, May 7th, 2018 AT 11:06 AM