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Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

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  #1  
Old 01-29-2013, 05:29 PM
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Default stalling and stuttering only after starting

i have a 94 6.5. ive had problems with pmd in the past and had one installed when it was still under warranty about 5 years ago. its mounted right in front of the battery. here recently i started having similiar problems so i swapped it out with a bbuddies just to see if it made a difference but did nothing. what has me puzzled is that it only stalls shortly after starting it. and then if i do make it out the driveway it will stutter for maybe a mile or 2, after that it runs ok. maybe lacking a little power. ive had some input on wut to do but as of now im at 3 or 4 maybe's and was just hoping to narrow my search before spending a bunch of money. anymore input would be greatly appreciated
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  #2  
Old 01-30-2013, 09:49 AM
racer55's Avatar
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Status: familiar with the 6.5 and then some

   

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Replace the IP fuel return line with diesel rated clear tubing and watch that line while a friend starts the truck,if it contains a lot of bubbles then air is getting the fuel system while parked.

Often that happens from the fuel heater or water in fuel sensor O-rings in the filter housing.

If the bubbles persist after the engine clears up and runs decent,an air leak between the fuel level in the tank and the LP is the likely cause.

Prove the LP is operating properly as well,with the engine idling,open the WIF drain valve and observe results.
If the engine stalls quickly the LP is not working and needs diagnosed.
If a decent stream of fuel flows out the line and the engine continues to run you have a strong LP.

On 94's,the OS electronic noise filter could be part of the problem as well,remove it completely and plug the OS harness directly into the OS-then get enough ferrite core to cover each OS harness wire(3 pieces IIRC).
After 19 years some things begin to get past their useful age and substitutes need to be made.

Last edited by racer55; 01-30-2013 at 09:51 AM..
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Old 01-30-2013, 07:22 PM
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thank you. i really appreciate the input but the only think i have a question about is what you are referring to as the OS?
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  #4  
Old 02-01-2013, 08:44 AM
racer55's Avatar
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Status: familiar with the 6.5 and then some

   

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The OS is the Optical Sensor.

Info on replacement and identification below.
Roy Halvorsen
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