check engine light, engine losing power - JeepForum.com

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post #1 of 22 Old 05-25-2005, 08:42 PM Thread Starter
kemicalburns
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check engine light, engine losing power

i have a 98 5.9. if you give it any more then 1/4 throttle it will bog down like its getting to much fuel or losing spark.

Well i finally made it home, limping along the best i could. checked the oil and it has a gas smell. so im thinking either an injector is stuck or my fuel pressure regulator is going or gone. im leaning more towards the fpr but not sure where its at. i dont own a manual yet and my rv trailer is up at our camping spot so i need to fix the jeep before i head back up on friday. ive disconnected the battery cables and cleaned up the terminals. need some quick help fellas.

thanks


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post #2 of 22 Old 05-25-2005, 09:13 PM
greasefingers
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Look carefully around each injector. I bet one of the O-rings is worn and is seeping fuel. I have to straight-six engine. The fuel pump delivers 40 psi to the fuel rail. The vacuum operated fuel pressure regulator is on my fuel rail. When regulator has vacuum, it diverts 10 psi back to the gas tank. So the fuel rail only sees only 30 psi. I would think that even new o-rings could maintain 40 psi however, but I do not know that for sure. It seems like they should because it would become a safety issue otherwise. The exhaust manifold is only 3 inches away.

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #3 of 22 Old 05-25-2005, 09:21 PM Thread Starter
kemicalburns
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checked the injectors , none are leaking fuel on the outside of intake

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post #4 of 22 Old 05-25-2005, 09:26 PM
greasefingers
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If you can smell it then you should be able to see it? Unless its evaporating as fast as it is leaking. Maybe a clogged Cat?

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #5 of 22 Old 05-25-2005, 09:30 PM Thread Starter
kemicalburns
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i smell gas on the oildipstick

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post #6 of 22 Old 05-25-2005, 09:38 PM
greasefingers
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Blown head gasket??

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #7 of 22 Old 05-26-2005, 08:04 AM Thread Starter
kemicalburns
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well there is no coolant lose and the rig never overheated. . also a blow headgasket wouldnt allow fuel into the oil pan

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post #8 of 22 Old 05-26-2005, 08:29 AM
greasefingers
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I am just throwin out suggestions. I guess if the valves had a lot of carbon on them and leaked, then gas vapors could get mixed in the upper part of the head and drain back thru the oil passages near the rockers? When I place a question mark at the end of a statement, it means that I am not sure about the statement.

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #9 of 22 Old 05-26-2005, 08:35 AM Thread Starter
kemicalburns
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i know sorry if i came off short. just frustrated , it seems more people do upgrades on here then actually fix/work on there rigs. i guess no one has had there fpr go out on them yet or experience similar symptoms like i am.

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post #10 of 22 Old 05-26-2005, 08:53 AM
RolledOverJEEP
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I'll bet it's either the fuel pressure regulator or PCV. My recomendation would be to junk the PCV that's in it now, and put a new one in, they are less than 5 bucks. I had the same problem with a Plymouth Voyager, gas in the oil. Well after a new fuel pump and FPR, it was about 90% gone, and that thing had some miles. Here's a link that shows the FPR location, just keep in mind this is for the WJ's. http://www.wjjeeps.com/fuel_filter.htm . Did you recently have a hard time getting it started and possible flood it? That's another way to get gas in the oil. Don't forget to change your oil! Gas in the oil with wear that bad boy out faster than anything.

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post #11 of 22 Old 05-26-2005, 08:53 AM
greasefingers
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No sweat. Good luck with her!

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #12 of 22 Old 05-26-2005, 08:59 AM
RolledOverJEEP
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One more thing, you mentioned the check engine ligt is on. Is it giving any codes? Try turning the key from off to the position just BEFORE starting, and then back to off 3 times. Then with the key in the ON ( not start!) position, watch the check engine light. It should flash code(s) such as the ones described here http://www.allpar.com/fix/80s-codes.html

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post #13 of 22 Old 05-26-2005, 08:59 AM Thread Starter
kemicalburns
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thats the funny thing its been driving around fine in town , never having any trouble starting in the mornings. but after towing my rv trailer up to the lake i didnt get half way before it started acting up. at first i could maintain about 3/4 throttle going about 45-50 mph, then after i droped the trailer off and started home i could only use 1/2 throttle then 1/4. i could barley get out of my own way. i also notice on the overhead console showing the current mpg at the time and when i had the problem my mpg would drop a lot. like start at 16 mpg then go down to 12 then 7 it even hit 5 on ocasion

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post #14 of 22 Old 05-26-2005, 09:03 AM Thread Starter
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yes there is a check engine light so i will do as you described. i was wondering how to pull codes with out a code reader. i know on my bronco you can use a paper clip and kinda do what you said. but this is way easier. i will let you know

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post #15 of 22 Old 05-26-2005, 09:14 AM
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Extracting Fault Codes:
Turn the ignition switch ON, OFF, ON, OFF, ON and observe the CHECK ENGINE LIGHT. The CHECK ENGINE LIGHT should begin to flash a series of codes. The flashes will be separated by short an long pauses. The long pauses separate the "ones" and "tens" positions, and each code from the next. A code 55 will be displayed at the end of the test.

Diagnostic Trouble Codes - 1995 Jeep

11 IGN reference signal.
12 Battery input to PCM disconnected during last 50 key starts.
13 Fault in the map sensor pneumatic circuit.
14 Fault in the map sensor electrical circuit.
15 Fault in the vehicle speed sensor circuit.
17 Engine running too cool.
21 Problem in the oxygen feedback circuit.
22 Fault in the coolant temperature sensor circuit.
23 Air temperature sensor.
24 Intake air temp. sensor voltage high.
25 Fault in the IAC motor drive circuit.
27 Fault in injector driver interface circuit.
33 Fault in air conditioning cutout relay circuit.
34 S/C solenoid circuits.
35 Fault in fan relay circuit.
41 Fault in the charging system or no field current.
42 Fault in the ASD relay driver circuit.
44 Battery Temp Voltage.
46 Battery voltage is too high.
47 Battery voltage is too low.
51 Lean condition is indicated.
52 Rich condition is indicated.
53 Internal problem in module.
54 No cam position signal.
55 Completion of fault code display.
62 Unsuccessful attempt to update EMR mileage.
63 Unsuccessful attempt to write to an EEPROM location by the controller.

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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