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1994 jeep cherokee engine cuts off
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drcjl13708
Novice
May 13, 2010, 10:39 AM
Post #1 of 5
(2574 views)
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1994 jeep cherokee engine cuts off
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1994 jeep cherokee and every so often the engin will just die on me. No set time fram when running, some times runs 2-3 days fine,then sometimes 20 minutes, and engine just dies. have no idea where to start with this . please all the help I can get will be great . thank you
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 13, 2010, 12:17 PM
Post #2 of 5
(2571 views)
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Re: 1994 jeep cherokee engine cuts off
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Does it start right back up and behave when it does this? You could get codes read that might help finding the issue.
If it runs fine otherwise and does just start up with no CEL staying lit it could be tricky to find the flaw,
T
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drcjl13708
Novice
May 13, 2010, 12:31 PM
Post #3 of 5
(2567 views)
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Re: 1994 jeep cherokee engine cuts off
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sometimes starts backup right away. but most of the time takes about ten fifteen min. to sratr up again. engine light doesnot come on at all. so auto store tells me they cant get a code without the light on.
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Hammer Time
Ultimate Carjunky
/ Moderator
May 13, 2010, 12:33 PM
Post #4 of 5
(2564 views)
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Re: 1994 jeep cherokee engine cuts off
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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 test 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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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 13, 2010, 12:39 PM
Post #5 of 5
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Re: 1994 jeep cherokee engine cuts off
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Should have asked the first time - When it doesn't start right back up does it "crank but not start" or "not crank at all?"
If it cranks while down, you have a short window to see if it lacks fuel or spark. Have starting fluid to test with some in throttle body - if it fires and quits there's a fuel problem.
Spark test at a plug while down with a spark tester - may require some help from someone to crank while you watch.
Usually it would be one or the other and can go on from there,
T
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