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post #1 of 3 Old 08-25-2019, 06:01 AM Thread Starter
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No Start

I have a 2005 Wrangler 4.0 that cranks but will not start. Pulled it in the garage last week and it was running fine. Went to use it a week later and it cranks strong but does not start. I have changed the crank sensor but that did not help. I'm thinking it may be the PCM. Is there a simple way to check it and if it is the PCM does anybody have an idea where to get a replacement?

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post #2 of 3 Old 08-25-2019, 08:45 AM
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2014 JK Wrangler 
Join Date: Oct 2017
Posts: 8,299
So a no start = PCM ?

What diagnostics have we done ?
Attached scanner and observe data?
checked for codes?
Fuel pressure?
12v at coil?
12v at injectors?
Inj pulse?

Try this as someone tries to start jeep spray carb cleaner into throttle body - did it fire and try to start?

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 3 Old 08-25-2019, 10:24 AM
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2000 XJ Cherokee 
Join Date: Apr 2002
Location: out in the garage - Minneapolis
Posts: 28,288
What is missing during the no-start, fuel pressure, fuel injector pulses, or spark ?

Failure of the PCM should only be considered after complete and in-depth trouble shooting and diagnostics of the more common and more logical causes for the symptoms described.

Did you install a genuine Jeep Crank Position Sensor, or a cheap crappy Chinese clone auto parts store CPS ?

“When the people find that they can vote themselves money, that will herald the end of the Republic.”

- Benjamin Franklin
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