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Old May 3rd, 2013, 07:16 PM   #1
Catnip 0_o
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Default 4.0L Misfire - Please Read

2002 TJ 4.0L 148k Miles

Alright so I'm starting to get real tired of all the repairs lately, it just seems like one after another. If you've seen my previous posts recently, you'd see that I was having steering play problems, luckily that is all take care of (finger crossed).

What is now happening is a problem I've been having for a long time, that I thought I fixed.

Symptoms: When driving the jeep at around 60-70 mph (2500-3000 rpms) my CEL will begin to flash signaling a misfire. It will then putter and when I pull up the code, I get the code for multiple/random misfire and a code for cylinder 3, 4, and 6. Well awhile back I thought it was fuel pump related because the fuel pressure was so low when I tested it, so I replaced the entire unit with a Spectra Premium. Shortly after, I still noticed at around 60-70 mph the CEL would flash. I've also replaced the spark plugs with both Champion OE and then tried Autolite Platinum. Replaced the Crank Position Sensor, Idle Air Control Sensor, and have thoroughly cleaned the throttle body.

Another strange symptom I have been having is when I first go to start it in the morning, I will start it, it will idle fine for about 5 seconds, and then begin to sputter for about 5 seconds and then fix itself, I am not sure if this is related or not.

Regardless, I really don't know what it could be anymore. Anyone else have the same problem or suggestion? I have read in the past 97-03 TJs have a problem with misfire after they change the Crank Sensor, but I am not sure...

Any advice/help is appreciated as always..
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Old May 3rd, 2013, 07:19 PM   #2
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Change ur tps sensor

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Old May 3rd, 2013, 07:28 PM   #3
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Change ur tps sensor

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I would but one of the frickin Screws that holds it in wont cooperate
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Old May 3rd, 2013, 07:35 PM   #4
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That sucks cu its prolly your issue

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Old May 3rd, 2013, 07:37 PM   #5
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I am suspecting the coil rail but I will drill out the screw that doesnt want to work with me and try that. Ive had a spare tps on hand for awhile
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Old May 3rd, 2013, 07:39 PM   #6
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I may have a spare coil pack laying around at work cant remember it i scrapped it or not ill check on monday if ur tps dont fix the issue

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Old May 3rd, 2013, 08:07 PM   #7
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I am suspecting the coil rail but I will drill out the screw that doesnt want to work with me and try that. Ive had a spare tps on hand for awhile
Check it with a multimeter or scan tool.
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Old May 3rd, 2013, 09:53 PM   #8
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Just replaced the tps, im doing the ignition coil as well regardless if the tps would fix it or not, i know the rail hasnt been changed since I bought it almost 3 years ago
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