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99 Jeep Grand Cherokee loses power


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dwmcclure84
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May 26, 2012, 7:23 PM

Post #1 of 5 (2312 views)
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99 Jeep Grand Cherokee loses power Sign In

1999 Jeep Grand CHerokee 4.7 L V8 149K

I have a jeep grand that will just die while driving. The jeep literally loses all power. It does not appear to matter if I am at highway speeds or stopped at a light, it will just shut off with no power. Sometimes it will restart within a few minutes-other times it's hours. It was throwing an error code of P0443 (EVAP system) and I had the purge solonoid replaced today. When leaving the repair shop it died two miles away. Any ideas?

TIA!


Discretesignals
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May 26, 2012, 7:48 PM

Post #2 of 5 (2302 views)
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Re: 99 Jeep Grand Cherokee loses power [In reply to] Sign In

Normally an EVAP concern or problem won't cause a stalling and no restart situation. In your case the P0443 is a purge valve circuit code which means the PCM detected an open or short in the purge valve circuit. A problem in that circuit shouldn't cause your concern unless it is linked to a wiring problem in a harness with other wiring that is crucial to the running of the engine that may be damaged or chaffing on something. If the code comes back, they are going to have to diagnose the code more accurately.

The problem with something like this is that it needs to be diagnosed when the engine doesn't want to restart. That means checking your basics such as fuel pressure, injector pulse, spark, and computer activity. One or more of those things are going to be missing when the engine doesn't want to restart. Once you know what is missing, you can formulate a strategy to diagnose where the problem is most likely to be.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on May 26, 2012, 7:53 PM)


dwmcclure84
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May 26, 2012, 7:53 PM

Post #3 of 5 (2289 views)
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Re: 99 Jeep Grand Cherokee loses power [In reply to] Sign In

Any idea on how to accomplish that? Should I buy a code reader and plug it in when it dies?


Discretesignals
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May 26, 2012, 7:58 PM

Post #4 of 5 (2286 views)
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Re: 99 Jeep Grand Cherokee loses power [In reply to] Sign In

You can plug in a code reader when it dies and doesn't want to restart to see if the PCM is alive and able to communicate with your code reader. That is only one piece of the puzzle though. Even though you are able to communicate with it doesn't mean if it is getting the inputs it needs to perform certain outputs or if the PCM is capable of controlling the outputs even though it is getting the correct inputs.

Like I mentioned above, you need to check for fuel pressure using a gauge, injector pulse, and spark during the no start also. Find out what is missing and then go from there.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on May 26, 2012, 8:01 PM)


dwmcclure84
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May 26, 2012, 8:01 PM

Post #5 of 5 (2279 views)
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Re: 99 Jeep Grand Cherokee loses power [In reply to] Sign In

Sorry I don't know how to do any of that. I can use google and forums and that about sums up what I know about cars. I have successfulkly replaced the alternator in it using youtube :)




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