Stalling before warm up?

AeroBoost

AeroBoost

Well-known member
Yea, that.
99 xj 4.0 is stalling, sometimes at Idle, before it gets warmed up good.
Idle is sometimes rough but usually fine. Get out in the road, hit the gas and "pluh"....
Just stalls. RPMs drop. won't go. Then suddenly as if being kicked in the rear, it takes off and doesn't do it again.

No codes.
I've been searching for vacuum leaks but can't find one. Not to say that's not happening; just can't find it.

ideas?
 
No codes... Will the stall / stumble actually clear an existing code and reset your emissions tests? I had a wire feeding the computer on my LJ randomly short out that would cause the computer to reset and act like a stumble similar to yours when I stepped on it. Took forever, and 3 unnecessary new computers, to successfully track it down to a wire inside one of those thick harnesses.
 
I don't know?
It's not throwing a light at all.
I could check and see if there's a code stored even though the light never came on.

any way to test the temp sensor?
 
I did some Giggle searching. Two diagnoses surfaced. One matched the aforementioned temp sensor. The other.....

1000009667.webp
 

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