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Old 12-10-2015, 09:43 PM
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Need help! 4.0 cranks but no start

I have a 99 Jeep Grand Cherokee Laredo with a 4.0 and I have been having issues with it cranking but not starting. I checked my codes and got the P0320 for the crankshaft position sensor. I replaced the sensor and the code went away, but it still won't start. WhIle I was at it I also put in a new camshaft position sensor. My jeep has a little over 150,000 miles so about a month ago I put in new spark plugs and also a new ignition coil pack bar also. I'm running out of options and do not know what is going on? Any help would be greally appreciated.

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Old 12-11-2015, 06:45 PM
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Re: Need help! 4.0 cranks but no start

Welcome to the garage.
He, i thought that you where driving a mini? (just kidding)
How did this all started, did it simply not start one day, or did it die when driving? I would first check if there is fuel under pressure at the fuel rail. You can just press the schräder valve on the rail and see if fuel under pressure comes out. Use a rag to catch the fuel. If no fuel comes out, switch the ignition in run for some seconds, off again and to run. Now check again. If no fuel comes out, it will be time to check fuses and swap the fuel pump relay with a same one in the PDC under the hood. You will need to check the following fuses in the PDC: #6, #19, #24 and #26. You also need to check fuse #12 on the junction block under the steering wheel area.
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