Still wont start after cam & crank sensor replacement - JeepForum.com
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post #1 of 6 Old 03-24-2017, 11:16 AM Thread Starter
jklanier84
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2002 KJ Liberty 
 
Join Date: Sep 2011
Location: Orlando
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Still wont start after cam & crank sensor replacement

hey all,
02 KJ, 4x4, 3.7L, 160k mi.

jeep started running a little sluggish Wednesday, then died at the light and wouldnt start
had it towed back to the house, and yesterday (Thursday) i pulled codes p0300 (multiple misfire) and p1391 (cam/crank sensor)
replaced the sensors this morning (Friday) and it still wont run.
It just turns over and over and over. I can smell a little unburned gas from the exhaust, and every once and a while it seems like it wants to start for a few turns of the crank then just goes back to spinning over.

NO IDEA what to do next. Its not throwing ANY codes now. HELP!


06 WK
02 Ironman KJ
"When you have a Jeep, you must do Jeep things."
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post #2 of 6 Old 03-24-2017, 12:14 PM Thread Starter
jklanier84
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2002 KJ Liberty 
 
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Minor Update.
Doing some research, it seems that the cam and crank sensors controll spark and fuel, so, if i can smell fuel then my guess is no spark.
going to see if im getting spark, anyone know which sensor controlls spark? cam or crank?
also i bought generic sensors and ive been reading that the OEM Jeep sensors are the way to go.. any thoughts?

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post #3 of 6 Old 03-24-2017, 01:53 PM Thread Starter
jklanier84
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ok so I have spark and fuel
also checked for any damage to the wire harness, looks fine
going to try OEM sensors i guess
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post #4 of 6 Old 03-28-2017, 02:45 AM
olliehopnoodle
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Give it a compression test. Unfortunatly with the 02 model it might be a dropped valve seat. If you have dropped a valve seat it will have zero compression in the cyl. Typically the first one to drop is the intake on the front two cyls (most forward). You can borrow a tester from your local parts store. I would do this next before buying any more parts.

82 Cherokee WT - SOA/SF/agr box/Borgeson ujoint steering shaft/401/performer/holley TA/HEI/BeCool/727/np208/d44(aussie)/amc20(ARB)/BFG 35X12.5/Corbeau Moab Seats/RCI 6point Harness,Hella Aux lights/tuffy console/killer32 slider bars/custom bumpers and roll bar/Alpine head unit/amps/speakers 2002 Liberty Limited Early edition - Basically stock
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post #5 of 6 Old 03-28-2017, 06:41 AM
streetglideok
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How much fuel pressure do you have? One squirt or two is not a good measurement. Need to use a pressure gauge and verify what you have before chasing things further. One foot in front of the other here. Sluggishness is a tip off to fuel pressure being insufficient. Next, where did you source the sensors? If you say autozone, etc, then go take a beer bottle and hit yourself in the head, and then go to the dealer and get the parts that belong in your jeep. Parts store garbage is just that, garbage.
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post #6 of 6 Old 04-11-2017, 03:46 PM
superbee
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Streetglide is right, you have to get the parts from the jeep dealer.
Ask me how I know?.....superbee
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