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Old 11-26-2008, 09:09 AM   #1
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Exclamation Engine running too rich...High Compression

Hi my engine is too rich...My compression when turned on is 88 p.s.i...My sypmtoms while driving is it shuts off and you can start it up 15 minutes later and drive another 10 miles...Ive replaced the Fuel Pressure Regulator, Fuel Pump, and Fuel Filter...My vaccum hose is working...But completely black spark plugs and black shooting out of the exhaust...My diagnostic codes are 12,33,54...Any clues how to fix this

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Old 11-26-2008, 12:09 PM   #2
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What compression is 88 psi? Where are you measuring it from? The fuel pressure? 49 psi is normal for a TJ. Are you sure about those 33 and 54 codes? Ignore the 12, but the 33 is air conditioning clutch solenoid related and the 54 code is only supposed to be for turbo equipped vehicles. What year and engine Jeep?

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Old 11-26-2008, 12:54 PM   #3
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Silly me, where do you get these diagnostic codes from?
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Old 11-26-2008, 01:40 PM   #4
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I got the codes from my Jeep Wrangler book...The 33 is because I dont have the Air Conditioning hooked up...Im serious when I say this...But its my fuel pressure...My engine compression matches up...But when I turn the key on it stays on 49 p.s.i....But when I turn the engine on...Its 88 p.s.i...I have a 95 Jeep Wrangler...4 cylinder...54 was the distributor timing I believe...I honestly dont know the differnce between TJ and YJ...
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Old 11-26-2008, 02:26 PM   #5
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what year is your jeep?
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Old 11-26-2008, 03:42 PM   #6
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its a 95
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Old 11-26-2008, 06:25 PM   #7
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I don't believe your fuel pressure for a 95 should be that high I believe it shoudl be somewhere around 14 to 15 for a throttle body style yj. I got this number from alldata but you might want to check this. Also the TBI has a regulator valve that is replacable, it is possible it went bad and you are pushing too much fuel into the cylinders.
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Old 11-26-2008, 07:00 PM   #8
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mine is a mpi
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Old 11-26-2008, 08:16 PM   #9
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yeah, he's got multi port, high fuel pressure can be from a kinked or clogged return line, but most jeeps are returnless fuel systems. if you have a return fuel line, check it, but you probably don't.
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Old 11-26-2008, 09:01 PM   #10
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I checked the return fuel line by taking a air pressurizer and shooting it through the line and listening through the other end...
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Old 11-26-2008, 09:20 PM   #11
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"Air Presurizer"

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