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94 Jeep Grand Cheroke engine turns off while idling and driving @ low speeds
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Guest
Anonymous Poster
tdg42701@yahoo.com
Jul 7, 2009, 3:07 AM
Post #1 of 2
(2608 views)
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94 Jeep Grand Cheroke engine turns off while idling and driving @ low speeds
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While i am driving my Jeep the engine will turn off, not the battery, just the engine. If we are stopped at a traffic light a passenger would not be able to tell unless they are looking at the RPM gage. There is no sputtering, or funny noise it simply stops, there is no flicker of the electronics on the inside the radio doesn't skip a beat. Often times I can put in nuetral and it starts right back up however sometimes it will not start back up. Normally it does this when idling but there have been occassions where i am traveling at about 30 mph and the engine turns off i am left coasting to a driveway, side of the road, or median to try to restart. Any idea what may be causing this problem?
I am unsure of the mileage exactly and the engine size.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 7, 2009, 3:24 AM
Post #2 of 2
(2602 views)
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Re: 94 Jeep Grand Cheroke engine turns off while idling and driving @ low speeds
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All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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