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Old 09-03-2010, 06:52 PM   #1
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99 wrangler wont start/stay running

UGH. still cant fix it. The only code it throws is p0172 system bank 1 too rich. and believe me it is running RICH. the exhaust fumes are wet with black spots out the tailpipe. sometimes it starts, sometimes it just wont turn over at all. then when it does get running.. itll be fine for 1-2 mins idleing and randomly shut off.

the entire exhaust is brand new, cat and 02s are new, fuel pressure is good, tps is good, crankshaft position sensor is good, MAP, spark plugs are good...

anyone!?!

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Old 09-03-2010, 07:02 PM   #2
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Try disconnecting the 02 sensor just below the exhaust header from where it is plugged into the harness and see what happens. A bad 02 sensor can cause the engine to run way rich like yours is doing.

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Old 09-03-2010, 07:26 PM   #3
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I just tried unplugging the 1st 02 sensor like you said and it still doesnt start
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Old 09-04-2010, 10:15 AM   #4
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bump
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Old 09-04-2010, 10:21 AM   #5
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Are you getting spark out of the coil that is bolted to the block below the distributor?
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Old 09-04-2010, 10:23 AM   #6
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son just had a terrible time with a comanche he bought, 4.0 engine-couldn't get it to run decent, etc.-was going to start replacing everything and then started to pull the plug wires or something-and found one that was 'in place' but NOT firmly-just enough to let it run 'sometimes' and othertimes it must have moved enough to not fire.
Plugged it firmly back in-engine is running like a full tuneup was done! So...take a deep breath, and start from square one. All 'basics', spark plug wires, ignition wiring, etc.-take each fitting apart or pull it off one by one, look for corrosion, arcing, plug it firmly back in place.
MY wife's cherokee- 94 Grand limited...also just had horrible stumbling and almost dying in idle...mechanic ran all the codes, ended up with corrosion in a 1 year old aluminum distributor cap, and a plug somewhere in the line where he had to pull it apart to plug in a code reader-must have had corrosion. AFter 2 days he couldn't get it to duplicate the problem and figured-simple corrosion in that wiring clip.
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Old 09-04-2010, 11:16 AM   #7
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Are you getting spark out of the coil that is bolted to the block below the distributor?

yes. spark is good too.
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Old 09-04-2010, 11:23 AM   #8
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Good spark leaving the distributor and all six plugs are getting good spark?
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Old 09-04-2010, 11:51 AM   #9
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Good spark leaving the distributor and all six plugs are getting good spark?
yessir.
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Old 09-04-2010, 12:17 PM   #10
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check to see if your spark plugs are fouled, check to see if you have a bad injector on the cylinders that bank one is on. reset the PCM, if all checks out it wouldnt suprise me if your PCM took a dump. if theres a way you can get one and swap it out for a test that would be ideal
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Old 09-04-2010, 12:39 PM   #11
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check to see if your spark plugs are fouled, check to see if you have a bad injector on the cylinders that bank one is on. reset the PCM, if all checks out it wouldnt suprise me if your PCM took a dump. if theres a way you can get one and swap it out for a test that would be ideal
how do i test an injector individually? and how do i know which cylinders bank 1 is on?
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Old 09-04-2010, 01:29 PM   #12
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You only have bank 1. Bank 1 and bank 2 are terms only used on newer Wranglers with four 02 sensors, yours only has two.
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Old 09-04-2010, 04:46 PM   #13
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ok thanks.

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