Question about 1994 Jeep Grand Cherokee

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Idoling on jeep drop and they car shut's off...

Sometimes the jeep start up then the idol drops and they it shuts off...

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This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control. If the above cleaning doesn't cure your issues you need to have the computer controlled automatic idle speed control system diagnosed and repaired by a dealer or electronic engine control repair shop.

Posted on Nov 05, 2012

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Posted on Jan 02, 2017

  • 188 Answers

SOURCE: 1988 jeep wrangler idoling rough

It does sound like a vacuum leak. Get a can of WD-40 and start spraying around the carb. It will rev up, and U can pin point the loose vacuum hose, are crack vacuum hose.

Posted on Feb 14, 2009

  • 66 Answers

SOURCE: jeep shuts off while driving

Crankshaft position sensor

Posted on Jun 29, 2009

  • 10 Answers

SOURCE: why is my grand 2004 grand cherochee idoling rough

The idle air control valve (IAC) may be stuck or failing. This solenoid-type device controls the airflow into the engine at idle. It is fed control input signals from the engine's computer. Over time, the IAC valve may become dirty from EGR gases and carbon, etc. It may have a worn pintle (valve head) or the return spring may be weak or broken, causing a rough idle or even stalling from an over-rich fuel/air mixture. The second thing to have checked is the throttle position sensor.TPS. These devices will "flag" a fault on your vehicle's onboard OBD-II computer, which a decent code reader/scanner can display and clear. Third, a dirty throttle body housing/venturi can cause rough idling and poor response. A special cleaner is needed to remove oil and carbon residues from the specially-coated inner surfaces of the throttle body. Fourth; you may have a Mass Airflow Sensor (MAF) that might be failing/malfunctioning. Some vehicles use these instead of the Manifold Absolute Pressure (MAP) Sensor, which you may have. These sensors need to be checked and verified that they are functioning properly. Fifth; check/change your vehicle's fuel filter, and verify proper/adequate fuel pump pressure and flow performance. Don't run your vehicle below 1/4 tank of fuel...doing this sharply reduces the life and cooling of the in-tank electric fuel pump. These are not cheap, or easy to replace!

Posted on Sep 12, 2009

  • 13 Answers

SOURCE: A loud ticking noise?

No I would not chase to the pistons, these vehicle were very comon in creating HLA noise hydraulic lash adjusting valves, meaning the valves pump up with oil as the oil gets thinner they dont pump up as fast and create a very loud ticking noise, I would not express a great concern over simplicity, dodge was famous for this, they really were.

Posted on Oct 23, 2009

  • 1 Answer

SOURCE: location of ignition module on a 96 jeep grand

96 Jeep Grand Cherokee wont start.Has fuel Press No spark.Poss Ignition Module?Cant Find location.

Posted on Mar 31, 2010

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1 Answer

Car drops idol when coming to a stop or when


use a crab spray in the throttle body and clean the black carbon right before the intake of the throttle plate.
take off the intake tube and have someone else open and close the throttle with the engine off of course.spray all the black stuff aronud the throttle plate or butterfly plate and make it nice and clean in there.use a very clean cloth rag .

hope this helps.
jm

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1988 jeep wrangler idoling rough


It does sound like a vacuum leak. Get a can of WD-40 and start spraying around the carb. It will rev up, and U can pin point the loose vacuum hose, are crack vacuum hose.

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99 mercury cougar wont idol until car is warm p0420 codes came up


Hello, here is a thread I found on this site with from what it looks like, the same problem(with an added solution) that you have. http://www.fixya.com/cars/t1576683-1999_cougar_diagnostic_code_p0430_p0420

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