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energizer
New User
Dec 20, 2012, 10:05 AM
Post #1 of 2
(1001 views)
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Electronic problem
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Hi All,
i am a owner fo teh JEEP CHEROKEE LAREDO 2009. i am having regular stop of engine when i am driving. and i always have to wait for long on teh same spot before the engine can start again. at time it takes a month without doing that and the day it starts it ca nhappen sevral time withing a limited time.
i have checked with mechanics but no solution was found to date.
can any body help me in this?
best
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 20, 2012, 10:18 AM
Post #2 of 2
(996 views)
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Re: Electronic problem
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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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