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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 06-19-2012, 02:04 AM   #1 (permalink)
philrich
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Runaway acceleration on my 6.5 L Diesel

I decided to post a thread after reading about this thread https://www.dieselplace.com/forum/showthread.php?t=42248

I have a 1997 Chevy Silverado Dully 3500 6.5 L Diesel truck and am trying to figure out which direction to go as far as fixing an issue I am having. Actually, this is a big issue! My wife was in a parking lot with the engine running and in drive when all of a sudden there was a lot of black smoke comming out of the engine and the tires were spinninh while she had the brakes applied. Apparently, the back end was swaying as the tires were spinning. She popped it in neutral and turned off the engine. After letting it set for about 5 minutes, she started the truck and drove back home. The truck would only engage up to the second gear and she was not able to go faster than 25 to 30 mph. The code that appeared was PO219 or fast throotle. The computer took on a safety mode and is why the tranny was locked into second gear.

I test drove it a few days later and it drove fine. The transmission was fine and all was working well. Before that, however, when I would drive it i noticed that every once in a while, there would be an extra burst of power almost like there was super charged gas going through to the pistons. This would not be too frequent rather 7 to 8 times per week. I would notice while at a traffic light mostly.

I took it in to get an analysis and the mechanic said it need a new fuel injection pump. I figured that after speaking with Bill Heath with Heath Diesel dot com and a repair facility that only repairs fuel injection systems. The prior owner of the truck installed the PDM away from the pump, on the side of the engine compartment above the front wheel well with its own fan to keep it cool, so I don't think the PDM is the issue, although it might be. I have in the past 12 months high pressure sprayed the engine to keep it clean and some water may have gotten in the PDM. Not sure, just a thought.

I am sure the majority will say to replace the fuel injection system, but having limited funds, I would rather approach this analytically. Realizing that there are several parts that make up the fuel injection system, i would rather seek a logical explanation to why the truck ranaway as other threads use that terminology.

The part # for the pump is either DS4831-5288 or 5521. Not sure since I have not physically seen the pump. I do not think it would be the shut off solenoid nor the PDM nor the cold advance solenoid since it creates stalls, which is not my case. Could it be the fuel transfer pump, the oil pressure switch or could it be again the PDM? Some insight would be great! If I could replace one part vs $1,700 for a new part plus install, then that would be ideal. Thanks for the time on reading and responding.

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Old 06-19-2012, 08:00 AM   #2 (permalink)
Big Bertha
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You are not going to get much responce in the performance section, maybe the mods can move it, but it sounds like a PMD issue, I bought a new PMD that did that, I exchanged it and that one did the same thing, I found out that the flight systems ( diapco, Dorman etc...) were having issues so I got a Stanadyne PMD and has worked since, have you changed the PMD or IP lately? The PMD on the side of the pump is bad it needs to be moved to the bumper, look at pmdcable.com or heath for an extension harness and new PMD, I would try a good known working PMD first, and then keep a spare in the glove box!

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Derek-
1996 K3500 Dually (f code)
-GEP motor with ARP head studs
-HX40 compressor wheel,HX35 CHRA 14cm2 with a peninsular intake
-Diamond eye exhaust
-All new accessories at 204,00
--4An fuel lines from tank to IP
-Pre and post LP filters, Walbro FRC 10
-Pillar gauges, battery mod, upgraded GP wires
-Braided oil cooler lines, PMD in bumper
-New IP
-S&B CAI,20" 9 blade fan
-223,000 miles
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Old 06-19-2012, 08:02 AM   #3 (permalink)
1995yukon65
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Check the name on the pmd, if it is anything other than stanadyne, such as flight systems, then I would start there, fs had a bad batch of pmds that when they failed they would go into full throttle mode. Already had it on my truck, bought a new pmd and an extension harness and mounted it to my front bumper. Haven't had a problem since then.
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1995 GMC yukon, HIDs hi and low (with high 4 kit), heath turbomaster, custom CAI, Cooper Discoverer st's 33x12.5/17s with no lift on factory '10 gm steelies painted black, swapped in 9.5" 14bolt semi-floating rear axle, DTECH pmd remote mounted in bumper, F-VIN heath gl4, F-intake, cat removed (dumping under truck for now), 3 gauge pillars with boost, egt, and trans temp, warpspeed 2.5" crossover pipe, lubrication specialist's oil cooler kit, 3" downpipe, arp studs, +.010 headgaskets
Soon to come: exhaust, SOLID AXLE SWAP.
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Old 06-19-2012, 10:58 AM   #4 (permalink)
philrich
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Just checked out the PMD. It is a Dtech made in the USA. Could this be the issue? It is mounted on the far right hand sideabove the front tire well and has a fan attached to an aluminum heat dispensing metal bar. It seems to be in a good location although not on the front bumper. Would you recommend a Stanadyne or is Dtech a better unit?

Apparently, Dtech hired Flight Systems to manufacture these PMDs. Based on what you have said, the DTech (FS) may be the issue.

Aside from the PMD, what other issues may cause runaway acceleration? It does sound like a computer issue vs a hardware issue. Thanks!

Last edited by philrich; 06-19-2012 at 11:14 AM.
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Old 06-19-2012, 12:31 PM   #5 (permalink)
Big Bertha
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I would still mount it in the bumper, and yes Dtech is a flight systems PMD, look at a kit that comes with the PMD, cooler and extension harness( not from ebay) find a reputable seller, Heath or pmdcable or Kennedy diesel as mentioned before.
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Derek-
1996 K3500 Dually (f code)
-GEP motor with ARP head studs
-HX40 compressor wheel,HX35 CHRA 14cm2 with a peninsular intake
-Diamond eye exhaust
-All new accessories at 204,00
--4An fuel lines from tank to IP
-Pre and post LP filters, Walbro FRC 10
-Pillar gauges, battery mod, upgraded GP wires
-Braided oil cooler lines, PMD in bumper
-New IP
-S&B CAI,20" 9 blade fan
-223,000 miles
.
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Old 06-19-2012, 02:58 PM   #6 (permalink)
philrich
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Quote:
Originally Posted by Big Bertha View Post
I would still mount it in the bumper, and yes Dtech is a flight systems PMD, look at a kit that comes with the PMD, cooler and extension harness( not from ebay) find a reputable seller, Heath or pmdcable or Kennedy diesel as mentioned before.
Thanks for the insight! I will order a new PMD and will keep you posted on the outcome. Once installed, I should know within a weeks time if it is working correctly. I will re-run it to the front pumper or around that area.
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Old 06-19-2012, 03:17 PM   #7 (permalink)
94C1500
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The PMD is the only logical explanation for those symptoms. How its supposed to work. PCM receives input from 3 sensors in the fuel pedal. If any one of them is actiing up the other two check it and cancel it out and you get a code for it. The PCM then looks up a fuel rate by pedal percentage and RPM and translates that into a pulse width to the PMD. The PMD takes that pulse width and spits it out in a higher voltage and current signal to the IP's fuel solenoid. The fuel solenoid reacts to the power by closing the metering valve which allows fuel to be pushed to the injector. Then the pulse goes away (to zero power) and the valve opens and repeats the process over and over.

The PMD is the middle man in the equation, and can often times go rogue. The PCM would control itself or any of its inputs and outputs.
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Last edited by 94C1500; 06-19-2012 at 03:19 PM.
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Old 06-19-2012, 03:26 PM   #8 (permalink)
philrich
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Interesting! Thus far the majority rule is the PMD. I say interesting because, Heathdiesel dot com says it's the Injection Pump and my mechanic says the same. I am hoping that a lot of people in my same situation can benefit from this thread. Will keep you all posted!
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Old 06-19-2012, 08:17 PM   #9 (permalink)
1995yukon65
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Well, funny story, i was told the same thing when my truck acted, same as many people here have, but I decided to just try the pmd for ****s and giggles because the IP on mine had less than 5k on it. And if it was the IP you would have zero control over it at all. When the armature shaft (iirc) breaks you basically have 2 pedal positions if your lucky, off or full throttle... I highly recommend replacing the pmd for starters and moving it to the bumper. I bolted mine to one of the valance holes in the bottom flange of the bumper and drilled a second hole for the other bolt.
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1995 GMC yukon, HIDs hi and low (with high 4 kit), heath turbomaster, custom CAI, Cooper Discoverer st's 33x12.5/17s with no lift on factory '10 gm steelies painted black, swapped in 9.5" 14bolt semi-floating rear axle, DTECH pmd remote mounted in bumper, F-VIN heath gl4, F-intake, cat removed (dumping under truck for now), 3 gauge pillars with boost, egt, and trans temp, warpspeed 2.5" crossover pipe, lubrication specialist's oil cooler kit, 3" downpipe, arp studs, +.010 headgaskets
Soon to come: exhaust, SOLID AXLE SWAP.
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Old 06-19-2012, 08:56 PM   #10 (permalink)
sshewins
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I thought D-Tech was supposed to be the best available? With heat soak and all... So stanadine(?) is the best choice?

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95 K3500 GMC 1 ton dump - 6.5, 110K miles, marine inj's, perf A/F, TM and 4" SS exhaust, ported intake, rebuilt heads

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