Question about 2001 Jeep Grand Cherokee

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2001 jeep grand Cherokee every time I start it Idles rough and cuts out until warm and if heater is turned on when cold it cuts out really bad and dies. but after completely warmed up runs fine. (?)

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  • Jeep Master
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Ok no engine stated?
if gas engine, ?
I bet never tuned-up up in decade,right?> that gets 99% here.
but it can be far more complex, not guessing,,
what if , the ECT reads wrong.
and the PCM thinks you are in ALASKA,and you are in key west,FL..
so,it floods cranked. and cold running,same...

all EFI cars do that ,everyone, like that.'

forget heater (that blow'r motor sucks 15amps and alternator puts that load on the engine, breaking the CAMELS back, for get that
fix MISFIRE COLD that is the problem.!! real.

and new spark plugs top that list????
a rich engine needs more spark, and on HILLS

and scanning the ECT.
does ECT read correctly first thing in morning before starting engine
yes ECT can be scanned keyon, not started.

correct means if last night was 40f, the ECT is 50f in morning
or lower. say 41f.
-20f wrong, 0f wrong , got that? not blow average of last nights
ambient air temps or garage temps parked. there.
the air cleaner can be packed.up
the ISC valve stuck (my 4.0L did that ever 10k miles)most of the cured in 90s with better ISC
leaking injectr.
misfiring cold
and more
best is a tuneup ,pray, and work form there.
doing tests.

Posted on Feb 07, 2017

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Posted on Jan 02, 2017

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