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  #85  
Old 04-24-2012, 03:47 PM
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Re: Surging, pulsing while driving

The thing thats making me hesitate about the coils, is that it happens randomly and if it was the coils wouldn't it pulse all the time? or not
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  #86  
Old 04-24-2012, 03:50 PM
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Dunno exactly but my Hemi was shutting off randomly at idle and at freeway speeds. Changed the coils as a new PCM and hasn't happened since. The surging it did randomly (like yours) has ceased as well. I have 71k on my Jeep so it was time for new ones anyways (coils that is) haha

Good luck!!
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  #87  
Old 04-24-2012, 04:01 PM
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Re: Surging, pulsing while driving

I hope the coils will be that last part i have to change. Guessing is the worst! Thanks man.
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  #88  
Old 04-24-2012, 04:19 PM
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Re: Surging, pulsing while driving

Quote:
Originally Posted by Madanio24 View Post
The thing thats making me hesitate about the coils, is that it happens randomly and if it was the coils wouldn't it pulse all the time? or not
Not necessarily. Mine didnt. Electrical shorts, etc are not always constant.
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  #89  
Old 04-24-2012, 04:54 PM
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Re: Surging, pulsing while driving

Quote:
Originally Posted by FlyinRyan View Post
Not necessarily. Mine didnt. Electrical shorts, etc are not always constant.
very true. will change the coils then. thanks!
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Old 04-24-2012, 06:55 PM
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Re: Surging, pulsing while driving

What did it cost to get a PCM update? I am assuming mine has never been done
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  #91  
Old 04-24-2012, 07:51 PM
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Re: Surging, pulsing while driving

Quote:
Originally Posted by Bleeding Blue View Post
What did it cost to get a PCM update? I am assuming mine has never been done
They did mine for free, i just booked in my car for diagnostic testing. The car defiantly shifts and drives a lot smoother. Im going to drive it for a few days to see how much its improved
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Old 04-26-2012, 02:26 PM
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Re: Surging, pulsing while driving

Hey guys i found the specifications for checking the coils resistance in the repair manual, but there is an entry for primary and secondary resistance. Would the primary be the two posts that plug into the cars wiring harness and secondary the actual part that sits on the plug?
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Old 05-01-2012, 06:12 PM
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Re: Surging, pulsing while driving

Just an update coils are good and replaced map sensor
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  #94  
Old 05-01-2012, 06:57 PM
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Re: Surging, pulsing while driving

Still having problems?
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  #95  
Old 05-01-2012, 07:04 PM
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Re: Surging, pulsing while driving

Will be testing it over these next few days and report back.
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Old 05-01-2012, 07:16 PM
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Re: Surging, pulsing while driving

Did you replace the coils or just test them?
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