1998 Jeep Grand Cherokee stalls not reliable

  • 3 POSTS
  • 6 CYL
  • 2WD
  • 117,303 MILES

1998 Jeep Grand Cherokee laredo with 117,303 miles
6 cyl 4.0 Automatic 2 Wheel Drive

hey guys' i've got a 98 jeep grand cher. Larado 4.0 L had trouble with a no start prob. Installed a naw crank sensor ' seem to fix the prob.' Lately it's been shuting off but will soon start back up seems to be worse when it's damp or raining out ' got the sensor from advaned auto ' ithink about 40$ dealer wants 145$ maybe cheap sensor? I'm lost this was the second sensor now ' did cap rotor and hall efect and coil at the first try. Any quesses? Joe THX.

Do you
have the same problem?
Wednesday, January 19th, 2011 AT 12:56 PM

1 Reply

  • 21,086 POSTS

I'm afraid guessing and throwing parts at it would just be futile.

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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Wednesday, January 19th, 2011 AT 1:16 PM

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