Jeep Cherokee 2.5CRD

Tiny
NAPO
  • MEMBER
  • 2002 JEEP CHEROKEE
  • 4 CYL
  • 4WD
  • MANUAL
  • 200,000 MILES
Hi, I have Jeep Cherokee 2.5CRD limited. I took the car in for suspension repair, They took the battery out for three days and after the car can only crank and smoke out a little bit, but won't run. I was told to leave the car on with battery power for an hour for the computer to re-adjust itself but no change. I tested the immobilizer with locking the doors and using the key in the ignition and that is fine. Now I am stuck.
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Tuesday, July 12th, 2011 AT 10:27 AM

3 Replies

Tiny
WRENCHTECH
  • EXPERT
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.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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Tuesday, July 12th, 2011 AT 12:23 PM
Tiny
ASHLEYAUTO
  • MEMBER
If you have the diesel engine good luck finding "spark plugs" I have had a few that just by changing battery will resets the immobilizer. Try haveing it reprogramed. The last one needed new computor. Good luck.
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Friday, July 22nd, 2011 AT 6:38 PM
Tiny
WRENCHTECH
  • EXPERT
I stand corrected. I didn't notice that it was a diesel.
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Friday, July 22nd, 2011 AT 9:29 PM

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