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1999 Jeep Cherokee 4.0 Wont Start!

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Old Dec 15, 2012 | 05:58 PM
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Default 1999 Jeep Cherokee 4.0 Wont Start!

i have a video for this problem i have just made. It was running a few days ago and now it wont run. Read the details on the youtube video for more info about it. Any feedback is great! Thanks!
http://www.youtube.com/watch?v=PZxAt...ature=youtu.be
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Old Dec 15, 2012 | 06:03 PM
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What are the codes? (sorry don't have time for your vid)
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Old Dec 15, 2012 | 06:19 PM
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dont have them. how could i get them? sorry im a noob at this!
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Old Dec 15, 2012 | 06:26 PM
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Buy or borrow an OBD2 scanner.
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Old Dec 15, 2012 | 06:45 PM
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Checking for codes is absolutely a good start. That may provide a definite roadmap to resolving this.

In the absence of any codes, you are going to have to resort to basic no-start troubleshooting. And that starts with spark.

Remove a plug, keep it attached to the plug wire, place the plug electrode near a good engine ground, have a buddy crank the engine while you watch. You are looking for a strong, BLUE, snapping spark. Yellow/orange/white indicates a weak spark which may not be strong enough to start the engine (weak spark usually is a weak coil).

IF spark checks out (and only if), then try a shot of starting fluid into the intake. If the engine starts and runs for a few seconds using this technique, then you have identified a "fuel delivery" problem.

Good luck and report back what you find with the above techniques!

Last edited by tjwalker; Dec 16, 2012 at 07:09 AM.
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Old Dec 15, 2012 | 06:46 PM
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Try putting it in "N" & see if it will start.If it does,the NSS is the problem.
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Old Dec 15, 2012 | 06:47 PM
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Thanks i will check the spark! and my check engine light it always on from fuel evap. my mechanic said its not major at all but just dumb enough to make it always on.
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Old Dec 15, 2012 | 06:50 PM
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Originally Posted by Big David
Try putting it in "N" & see if it will start.If it does,the NSS is the problem.
The engine turns over fine. Because of this, it is NOT a neutral safety switch issue. If the NSS is problematic, the engine will not turn over at all.
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Old Dec 15, 2012 | 07:02 PM
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Originally Posted by CherokeeChief90
Thanks i will check the spark! and my check engine light it always on from fuel evap. my mechanic said its not major at all but just dumb enough to make it always on.
Bad ju ju mate.

You could have mutiple diagnostic trouble codes stored with one Check Engine light. Have the PCM scanned again, looking for all existing codes and pending codes.

List them here please.

Edit: List the code number(s), not the generic interpretation of your mechanic.
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Old Dec 16, 2012 | 12:39 PM
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Originally Posted by tjwalker
The engine turns over fine. If the NSS is problematic, the engine will not turn over at all.
You say will not start,not,turns over but won't crank.I know about the NSS,& I guess you do also.

Next time make the post more clear.You get a better response when you explain the issue better.
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Old Dec 16, 2012 | 04:32 PM
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Originally Posted by Big David
Try putting it in "N" & see if it will start.If it does,the NSS is the problem.
This is a HUGE misdiagnoses that a LOT of guys use. Not turning over can be a host of things, including, but not limited to, the neutral safety switch.
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Old Dec 17, 2012 | 04:18 AM
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check the ASD relay
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