2002 Jeep Wrangler X 4.0 CRANKS BUT WONT START AND RUN! - Jeep Wrangler Forum
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Old 08-08-2014, 01:46 AM   #1
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2002 Jeep Wrangler X 4.0 CRANKS BUT WONT START AND RUN!

Okay so I just got done replacing my motor in my tj, fuel pressure is there (dont know exact psi), getting spark, and air. When I turn the key it will crank over and try to start but wont run.
Headers are on but y-pipe hasnt been installed yet all other sensors are in please help!!

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Old 08-08-2014, 09:41 AM   #2
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Do you smell fuel after cranking away? have you checked all the fuses?

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Old 08-08-2014, 12:03 PM   #3
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Yes I can smell fuel, and I can see flames coming from headers. All fuses looked good.
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Old 08-08-2014, 01:13 PM   #4
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Quote:
Originally Posted by mrcarcrazy View Post
Do you smell fuel after cranking away? have you checked all the fuses?
yes, and yes
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Old 08-08-2014, 02:01 PM   #5
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Rail pressure?
Injectors clicking or injector harness flashing a test light?
spark at coil pack checked directly?

What was done to engine
Timing chain off a tooth or more
compression ratio

Have sentry key
change PCM from a different jeep?
Good gas ie adequate amount and no old crap gas or water in tank?

Injection of quality fuel in proper ratio plus adequate properly timed spark plus mechanically sound engine plus spinning engine + unobstructed air in and exhaust out = will start
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Old 08-08-2014, 02:37 PM   #6
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Quote:
Originally Posted by Digger84 View Post
Rail pressure?
Injectors clicking or injector harness flashing a test light?
spark at coil pack checked directly?

What was done to engine
Timing chain off a tooth or more
compression ratio

Have sentry key
change PCM from a different jeep?
Good gas ie adequate amount and no old crap gas or water in tank?

Injection of quality fuel in proper ratio plus adequate properly timed spark plus mechanically sound engine plus spinning engine + unobstructed air in and exhaust out = will start
Bought an ATK engine to replace old POS 4.0 came pre-timed, its getting spark and everything. Tried to set 1st cylinder to tdc last night then reinstall the camshaft sensor but it still was acting up. Some of my mechanic friends think it might be a bad sensor or its out 180*.


When i turn the key it will try to run and will shoot small flames out of the exhaust headers, and wont run
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Old 08-08-2014, 03:03 PM   #7
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Who installed the flex plate/flywheel?
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Old 08-08-2014, 03:18 PM   #8
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Quote:
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Who installed the flex plate/flywheel?
I did?
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Old 08-08-2014, 03:45 PM   #9
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new or original flex plate or flywheel

cam out of time could explain as exhaust valve open to early will let out flame and not let run

Brand new so could be wrong so why not pull all plugs and do a good compression check
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Old 08-08-2014, 05:07 PM   #10
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I did?
Did you index it correctly?
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Old 08-08-2014, 05:51 PM   #11
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Is yours the year that the CPS requires the paper spacer between the bellhousing and sensor? If so that spacer needs to be in place.
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Old 08-08-2014, 06:27 PM   #12
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The bolt holes are not evenly spaced so on the 4.0 the flex plate or flywheel will only bolt on correctly indexed

They look close to symmetric but all the plate to crank bolts will only line up on correct rotation of plate
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Old 08-08-2014, 06:50 PM   #13
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The bolt holes are not evenly spaced so on the 4.0 the flex plate or flywheel will only bolt on correctly indexed
Agreed. But every now and then, somebody decides to make things fit that were not intended to.
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Old 08-08-2014, 10:33 PM   #14
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try your computer i know it sounds bizarre but i thought i had a fuel issue for the longest time turned out to be a bad computer
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Old 08-12-2014, 07:08 PM   #15
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It was the CAM sensor, got it running

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