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Technical Advice and Questions / need help - jeep will crank but not start...
« on: November 05, 2012, 08:23:36 am »
my jeep is a 2002 wrangler with a 4.0 and 5-speed, has 100k miles.
so my jeep started off with a misfire-type knock. i finally decided to get into the engine's internals and found that a valve lifter was damaged, causing the pushrod to not work. this did not allow #6 cylinder intake valve to open, causing the noise.
i replaced all lifters, lapped the valves, and cleaned the head. checked the slack in the timing chain and verified tdc and timing marks were aligned. after putting things back, i went to start the jeep and it would just crank and not start. the jeep wasn't throwing any codes.
so i checked the fuel pressure and got about 45 psi. i ended up replacing the iac, camshaft position sensor, and crankshaft position sensor.
i tried starting the jeep again and it gave a low rumbled idle and died after 2-3 sec. after many attempts at starting, i got the same results. i even rotated the camshaft position sensor 180 degrees just to make sure the timing was okay. doing this didn't allow the jeep to idle at all, just crank. so i returned the sensor back to original.
i got a spark tester and tested each spark plug boot on the ignition coil rail. i got the same size and color spark for all 6. i checked the resistance of the fuel injectors and got about 10 ohms each. i pulled the spark plugs and smelled gas on them.
so i returned everything back and tried to start it once again. it cranked and cranked and had a low rumbled idle again, then died after 2-3 seconds.
i'm hoping it's not the pcm/ecu. i'm not sure if i provided all of my troubleshooting efforts, but i guess i'm too frustrated with the jeep. any help would be great. also, i was wondering if anyone has an ecu/pcm that i could borrow to see if my jeep would start, preferably for a 2000-2002 4.0 with a manual tranny.
thanks in advance for the assistance.
so my jeep started off with a misfire-type knock. i finally decided to get into the engine's internals and found that a valve lifter was damaged, causing the pushrod to not work. this did not allow #6 cylinder intake valve to open, causing the noise.
i replaced all lifters, lapped the valves, and cleaned the head. checked the slack in the timing chain and verified tdc and timing marks were aligned. after putting things back, i went to start the jeep and it would just crank and not start. the jeep wasn't throwing any codes.
so i checked the fuel pressure and got about 45 psi. i ended up replacing the iac, camshaft position sensor, and crankshaft position sensor.
i tried starting the jeep again and it gave a low rumbled idle and died after 2-3 sec. after many attempts at starting, i got the same results. i even rotated the camshaft position sensor 180 degrees just to make sure the timing was okay. doing this didn't allow the jeep to idle at all, just crank. so i returned the sensor back to original.
i got a spark tester and tested each spark plug boot on the ignition coil rail. i got the same size and color spark for all 6. i checked the resistance of the fuel injectors and got about 10 ohms each. i pulled the spark plugs and smelled gas on them.
so i returned everything back and tried to start it once again. it cranked and cranked and had a low rumbled idle again, then died after 2-3 seconds.
i'm hoping it's not the pcm/ecu. i'm not sure if i provided all of my troubleshooting efforts, but i guess i'm too frustrated with the jeep. any help would be great. also, i was wondering if anyone has an ecu/pcm that i could borrow to see if my jeep would start, preferably for a 2000-2002 4.0 with a manual tranny.
thanks in advance for the assistance.
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Technical Advice and Questions / engine knocking...need a rebuild...
« on: February 17, 2012, 10:41:31 pm »
anyone know of a decent shop around the red lion/york area that can rebuild the 4.0 without charging an arm and a leg? my engine noise is a knock, not a tap, and doesn't go away after warming up. i haven't pulled the oil pan yet to check if it's a piston skirt, but want to rebuild the engine anyways.
thanks in advance for the help.
thanks in advance for the help.
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Technical Advice and Questions / a knocking noise only when gear is engaged...
« on: June 12, 2011, 12:35:11 am »
my jeep is a 2002 tj, 4.0l, 5 speed, 4" lift, 33" tires, d30 spartan locker. last week, i was going through a round-a-bout in 3rd gear and heard a clunking/knocking noise coming from underneath around the tranny area. i placed it in neutral (noise went away) and i slowed down. i then downshifted to 2nd and released the clutch and the noise came back. so i pulled off the road and stopped. when i shifted to 1st and released the clutch, the noise returned. so i had aaa tow it back to my house.
when i got home, i drove down my street. 1st gear with clutch engaged and noise was there. i shifted to 2nd, noise went away during the shift but returned once in gear. the noise frequency is based on vehicle speed, not engine speed. so i tried starting in 4th, and the noise was still there. throughout this troubleshooting, with the clutch depressed i noticed the noise was a 2-3 on a scale of 10. when in gear and clutch released, the noise was a 8-9.
the driveshaft u-joints look okay and so do the axle u-joints. i'm leaning towards u-joints or axle bearings in the front. i plan on changing the clutch since it's still the original one with 87k miles, so that will give me a chance to checkout the tranny and t-case. any help is greatly appreciated. thanks.
when i got home, i drove down my street. 1st gear with clutch engaged and noise was there. i shifted to 2nd, noise went away during the shift but returned once in gear. the noise frequency is based on vehicle speed, not engine speed. so i tried starting in 4th, and the noise was still there. throughout this troubleshooting, with the clutch depressed i noticed the noise was a 2-3 on a scale of 10. when in gear and clutch released, the noise was a 8-9.
the driveshaft u-joints look okay and so do the axle u-joints. i'm leaning towards u-joints or axle bearings in the front. i plan on changing the clutch since it's still the original one with 87k miles, so that will give me a chance to checkout the tranny and t-case. any help is greatly appreciated. thanks.
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