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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 09-07-2011, 11:32 AM   #1 (permalink)
6.2cushman
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6.5 diesel runaway, wide open throttle

has any one ever had a 1998 6.5 run away, shut the key off and all is normal, will it ever happen again

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Old 09-07-2011, 11:36 AM   #2 (permalink)
Bison
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PMD failure

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Old 09-07-2011, 11:48 AM   #3 (permalink)
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Or broken armature in the IP...
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Old 09-07-2011, 03:58 PM   #4 (permalink)
Ms54Coupe
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Quote:
Originally Posted by Bison View Post
PMD failure
X2

I hear this is a form of PMD failure and the truck will rev until the fuel shut off solenoid kicks in and cuts fuel out to stall the engine.
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Old 09-07-2011, 06:51 PM   #5 (permalink)
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Usually PMD related failures result in momentary runaway though, not a constant "as long as the key is on" runaway.

Third option is turbo failure, but turning the key off wouldn't have stopped the engine.
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Old 09-07-2011, 06:52 PM   #6 (permalink)
PrivatePilot
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Usually PMD related failures result in momentary runaway though, not a constant "as long as the key is on" runaway.

Third option is turbo failure, but turning the key off wouldn't have stopped the engine.
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Old 09-07-2011, 07:21 PM   #7 (permalink)
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Busted armature in the IP is the #1 cause.

2nd cause would be a bad D-tech PMD. If the PMD is original, then it's not a Dtech. The Stanadyne PMDs didn't do this for some reason.
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Old 09-07-2011, 11:05 PM   #8 (permalink)
6.2cushman
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If the injection pump had a busted armeture, would it do all the time. I was leaning on the pmd, I have it remote mounted to a heat sink on the firewall, The pmd is mounted upside down, maybe that is bad
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Old 09-07-2011, 11:55 PM   #9 (permalink)
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Is that a DTech/FlightSystem PMD???

If it is inside the hood, it is still hot. Even outside PMD will still fail. Inside will be faster.

Only way to know is to put a known working PMD and see if the symptoms come back.

Also make sure the Fuel Filter is clean.
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Old 09-08-2011, 10:23 AM   #10 (permalink)
GbByChubsy
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Armature Pin, game over new IP..............

And no, it would not necessairly run-a-way all the time. Mine shook violently for awhile, then I gave it some gas on the lift and the engine took off.

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