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2003 jeep shuts down when at temp
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mwcohio
New User
Mar 14, 2014, 8:27 AM
Post #1 of 3
(1275 views)
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2003 jeep shuts down when at temp
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I have a 2003 Jeep Grand Cherokee 4liter. Today as I was driving it just shut off. After 20 min. I was able to restart. Temp guage shows normal, but its doing this all the time now. Starts fine cold. Any troubleshooting tips would be apreciated.
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 14, 2014, 8:35 AM
Post #2 of 3
(1272 views)
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Re: 2003 jeep shuts down when at temp
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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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kev2
Veteran
Mar 14, 2014, 9:50 AM
Post #3 of 3
(1256 views)
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Re: 2003 jeep shuts down when at temp
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jeeps are often an easy troubleshoot
To focus on HT's answer- let us know if there is a remote starter, is the CEL light on*, do ou have and can use a test light? THen its 1-2-3.
* the CEL should come on at every start... then go out @2seconds.
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