96 4.0 runs rough when cold. once warm runs normal.

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May 12, 2015 | 09:51 AM

stoneysxj89

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Joined: Feb 2015

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Model: Cherokee

96 4.0 runs rough when cold. once warm runs normal.

Any ideas folks?

May 12, 2015 | 10:00 AM

MurderCityXJ

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Joined: Jan 2015

Posts: 398

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From: Metro Detroit

Year: 1999

Model: Cherokee

Engine: 4.0

96 4.0 runs rough when cold. once warm runs normal.

Quote:

Originally Posted by stoneysxj89

Any ideas folks?

Is there any hesitation or bucking if you take off before its warmed up and no longer running rough?

May 12, 2015 | 04:05 PM

stoneysxj89

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Junior Member

Joined: Feb 2015

Posts: 42

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Model: Cherokee

It backfires and hesitates. But once warm its ok

May 12, 2015 | 04:23 PM

MurderCityXJ

Seasoned Member

Joined: Jan 2015

Posts: 398

Likes: 2

From: Metro Detroit

Year: 1999

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by stoneysxj89

It backfires and hesitates. But once warm its ok

I had the same issue. Clean your IAC, and if there is little/no change, look into replacing your upstream o2. I didn't see a CEL until it was pretty much spent, but pretty much the same symptoms.

May 12, 2015 | 10:37 PM

stoneysxj89

Thread Starter

Junior Member

Joined: Feb 2015

Posts: 42

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Model: Cherokee

Thanks for the info. Ill do that tomorrow. I know the first cylinder compression is low, but its been running ok until just couple days ago. I was suspecting oxygen sensor. Ill check them tomorrow. Lazy currently. I work on cars all day, last thing i wanna do after 5 is work on mine lol