2004 Jeep Grand Cherokee cranks but won't start - JeepForum.com
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post #1 of 4 Old 06-06-2020, 02:32 PM Thread Starter
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2004 Jeep Grand Cherokee cranks but won't start

My sister's Jeep won't start, am I missing anything here or should I just take it to the shop? Symptoms:

Cranks, but won't start
ASD and Fuel pump relay clicking on and off (vibrating)
Things we have checked/replaced

Fuel pump getting pressure (had to bypass ASD relay)
Battery has good connection and is in good condition
Got new key made
New Preprogrammed PCM
Starter was bought last year
New Crankshaft position sensor
New sparkplugs (has COP so haven't check if it has spark)
Tried a OBD2 codereader, but stuck on reading (works fine on my car)
The only thing I can think of is maybe the new PCM is messed up. Any ideas?

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post #2 of 4 Old 06-06-2020, 02:40 PM
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2014 JK Wrangler 
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When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 4 Old 06-06-2020, 03:38 PM
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Location: bakersfield
Posts: 39
So you have fuel pressure at the rail on the engine?
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post #4 of 4 Old 06-06-2020, 05:37 PM
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2004 WJ 
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Location: South Bend, IN
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When I get one of these in with a crank no start the first thing I do is get the scan tool out and monitor live data and verify the pcm is getting rotation input from the crank and cam sensors.

From there make sure the ASD relay is powering up and fire both the coils and fuel injectors to verify the pcm drivers are working properly.

From there if it wont start or starts and dies after a few seconds I'll take loose an O2 sensor, starting to see more and more plugged cats due to the age and mileage with these and that usually lets them breathe enough to get started and running.
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