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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 07-10-2019, 03:52 PM   #1 (permalink)
kerrye
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Odd fuel/shift/engine symptom

93 GMC so all mechanical engine. Had transmission rebuilt. Drove fine for 800 miles no towing. Started towing 8500 lb boat. First 15 miles flat no problems. Turned up a fairly steep hill. At the point of the 2-3 shift the engine cut out abruptly as if I had taken my foot off the accelerator, dropped about 300 rpm’s, kicked in again and repeated then continued as normal. Next stop sign on flatter road it did the same thing. Got to destination. No reverse gear. Code said solenoid B stuck off and gear ratio error No idea how that would cause abrupt cutting off of fuel, apparently. Any explanation? I’ve never had a plugged fuel filter on a 6.5. Is that behavior typical of a plugged fuel filter on 6.5 and it is only accidentally related to transmission fault? If it were a drive by wire system I’d have said the pump momentarily lost the signal from the pedal. Also after sitting for a while the code for a quad driver module problem came up.

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93 GMC 2500 pickup
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New Optimizer 10/14
Rebuilt Central Plains Diesel IP 10/14
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Old 07-10-2019, 04:02 PM   #2 (permalink)
kerrye
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By the way I do have a fuel pressure gauge but stupidly failed to look at it when this happened. It has adequate fuel pressure when I look at it usually

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4WD Xtra cab.
New Optimizer 10/14
Rebuilt Central Plains Diesel IP 10/14
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Old 07-10-2019, 10:21 PM   #3 (permalink)
kerrye
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Just had a thought: maybe it was my wastegate blowing off. I didn’t think to look back for black smoke.
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4WD Xtra cab.
New Optimizer 10/14
Rebuilt Central Plains Diesel IP 10/14
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