Any chevy guys out there? - Ford Powerstroke Diesel Forum
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post #1 of 19 Old 09-23-2009, 07:32 AM Thread Starter
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Any chevy guys out there?

I know this is an odd place to ask this question, but does anyone have any technical knowledge of the chevy/gmc 6.5L turbo-diesel? A guy I work with has one that dies randomly and it's getting depressing watching him fret over it. Already tried replacing the PDM.


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post #2 of 19 Old 09-23-2009, 07:41 AM
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Need more info, model year, bio fuel? if so what %, yes it matters, there is an optical sensor in the DB pump-needs clear fuel. need codes, 93-95 can be done with a jumper, 96+ need a scan tool


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post #3 of 19 Old 09-23-2009, 07:46 AM Thread Starter
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It's a '98. Says no codes come up (no eng. light), and he's not running any biofuels.


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post #4 of 19 Old 09-23-2009, 07:50 AM
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when does it die? getting on it? idle? etc.


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post #5 of 19 Old 09-23-2009, 08:04 AM Thread Starter
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There doesn't seem to be a pattern. mostly does it before its warmed up. And its a sudden thing too. A quick shut down like someone turned the key off.


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post #6 of 19 Old 09-23-2009, 08:09 AM
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If he can scan for codes, can he look at data? need to monitor FPW, see if it drops out when it stalls, if it do, it's most likely the driver module, seen them bad right out of the box, most are made in china now


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post #7 of 19 Old 09-23-2009, 08:32 AM
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there is a little black box on the side of the injection pump its called a PMD... known for going out.


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post #8 of 19 Old 09-23-2009, 08:37 AM Thread Starter
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He's tried plugging in a new PMD, it does the same thing. Those can really be bad from the factory? How would he determine if the ECM is still good?


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post #9 of 19 Old 09-23-2009, 02:04 PM
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Quote:
Originally Posted by nccatfan View Post
He's tried plugging in a new PMD, it does the same thing. Those can really be bad from the factory? How would he determine if the ECM is still good?

Yes as of late when you buy a PMD from ac delco and open the box, a little tag with chicken scratch falls out. these are now made in china and they are garbage. it could be any number of things causing it to stall. generally a PMD failure happens when hot.

a scan tool with graphing capabilities to capture an intermittent like this-no codes, is very helpful, otherwise you are just guessing what miracle goes away.


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post #10 of 19 Old 09-23-2009, 02:54 PM
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SSDiesel Supply :: GM 6.5 TD Specialists, PMD failure, FSD heat sync kit. try this. its suppose to solve the problem of them burning up.


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