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Home > Home & Garden > Cars & Trucks   »   Engine turns over but won't start

 
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Old Aug 18, 2006, 07:08 AM
wrangler1120
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Engine turns over but won't start

Hello, havin a problem with my 1997 Jeep wrangler

Jeep died on Saturday. Won't start so we tow it to my cousin's house where we are trying to diagnose the problem. The engine turns over but won't start. My first guess was the fuel pump, so we jumped the relay and it works. Tried starting the truck while doing that but it still won't start. Next I checked the ignition switch, not that. Thought maybe my PCM (cpu) was going, so I swapped mine into my buddies 97 Jeep and his truck started fine, so it's not my computer.
Checked the ignition coil, and it's not getting power. (Checked the voltage to the IC, and its grounded on both sides). I checked ALL fuses and relays and they are all fine.

Aside, none of my gauges work on the instrument cluster and the check engine light is not on, nor does it come on when I turn the key to run or start to crank the motor. Tried to get the codes using the on-off-on-off-on method but no blinking check engine light. Tried using a code scanner which powers up, but I get a link error. So, again I put my PCM into my buddies jeep and read cpu and got no engine codes.

Basically, I'm stumped. Been posting around on various other automotive forums but haven't got a definite answer. I'm wondering if anyone has had a similiar problem and might be able to direct me where eles to check. If not ANY suggestions would be greatly appreciated.

Thanks

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Old Aug 18, 2006, 10:00 AM   #2  
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First, I would thoroughly checked out the main relay? On some cars a dead main relay = no spark. Second, I would focus on the ignition switch. That could explain why your instrument panel doesn't light up. Third, I would ensure the integrity of the ECU's main ground and that the ECU is getting power. Fourth, if your Jeep has a MAP sensor, I would check the reference and signal voltages going to the MAP sensor connector. Fifth, I would check out the MAP sensor. Bad MAP sensors, on some cars, can prevent spark and fuel.
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Old Aug 21, 2006, 09:40 AM   #3  
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Crankshaft position sensor in case anyone needs help with a similiar problem since you guys were soooo helpful...
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