Question about 1998 Jeep Grand Cherokee

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When the engine is cold, it stalls. but will restart ok

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  • Jeep Master
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Here are the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Posted on Oct 02, 2009

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  • Jeep Master
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Low / uneven idle problem can cause by a lot of components.

Dirty air filter

Dirty injectors + o-rings

Vacuum leak at intake manifold and vacuum hose.

Bad Idle Air Control Motor (IAC)

Low compression (170 psi + is OK)

Start cleaning and repair these trouble spots and see is there any improvement.

====

For more advance DIY'er then you may try this.

Use a can of Berryman carburetor clean to locate the vacuum leak.


SEE SAMPLE PICTURE HERE


This is a 20-30 minutes job.

Vacuum leaks can occur in following locations.


Intake manifold AND/OR vacuum lines.


Intake manifold is not accessible unless the engine head if off.

You can still check the potential leak by spraying some Berryman near the intake manifold.

Listen for rpm increase after you introduce the Berryman (FUEL) at idle.


Do the same starting from the brake booster unit (the round unit) on the drive side fire all.

Carefully listen for increase of RPM right after to spray the Berryman to the potential vacuum spot.

Get a friend to HEAR the ROM increase or monitor for RPM on the tech.

DO NOT AIM the Berryman into any heat source.


PLEASE RATE my answer if it is useful to you.

Posted on Dec 14, 2009

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2 Answers

I have a toyota yaris sedan year 2008. since several days my cars stalls while driving. i have change the fuel pump and fuel filter. the problem was same. i then replace and second hand air flow meter for...


wana GUE$$ or test.
which is it?
which engine?, we cant guess them here. ever.
it like 1million post now www, new pump, new (list of 10 things) and still runs bad. why do that>? the tool is 20 bucks to prove pump good. (and a ton of wasted labor)
learn to DIAGNOSE. (?)

i cant help you all, i have only above is parts lists.
we need SYMPTOMS and tests.
all i have is "Stalls while driving."
I assume nothing, I let testing facts dictate all my actions.

ok (50 to 100 causes) so..... what.?
now my 20 questions,sorry , engines and EFI are complex.
hint join toyotanation? not here?

  1. starts ok hot and cold engine?.
  2. idle at 800 rpm and regulates there hot.?
  3. stalls hot and engine,?
  4. stalls coming to stop signs? or foot pedal hard, or?
  5. does dash lights/gauges go odd just before stall) 12vdc power.?
  6. ever get a full tuneup in last 8 years, what is miles on engine.
  7. does restart easy.?
  8. does doing a fancy right foot action save stall (y/n (hard or easy yes?)
  9. if not restart is there spark now?
  10. if no restart, does test fuel work,
  11. ever read spark plug tips to see if they are black,green ,soaking in fuel or bone dry? or oil soaked ,
  12. and more , im tired,


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