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Pete, Auto Service Technician
Category: Chevy
Satisfied Customers: 29139
Experience:  14 years GM dealer Technician.
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1997 G30 Van, 6.5l Diesel, 115k miles. Video 1: Startup and

Customer Question

1997 G30 Van, 6.5l Diesel, 115k miles. Video 1: Startup and sensitive accelerator pedal Video 2: Shifting gears, black smoke Symptoms: Rough/Fast idle when cold Accelerator pedal very, very sensitive
when cold, either idle or WOT with slightest pressure on pedal. Normalizes once engine heats up and is ok at every restart throughout the day. On Highway, won’t upshift into OD unless I manually move shifter down to 3 then up to D. Then won’t stay in OD if
any gas is applied, immediately downshifts. Same symptoms with engine hot or cold Major black smoke under slightest load. (discontinued once I spiked diesel with Howe’s fuel cleaner) but symptoms above persist. Slow to engage reverse when shifted into reverse,
could be a separate but coincidental issue. What I’ve done: Spiked fuel with Howes fuel treatment. Changed Fuel and Air Filter Swapped PMDs ( has remotely mounted PMD with heat sink and two fans blowing on it.) Hasn’t burned out a PMD since I did this conversion
15k+ miles ago. Tested accelerator pedal resistance and voltage parameters, checked out OK Checked for bubbles with clear fuel return hose, saw none.
Submitted: 2 years ago.
Category: Chevy
Expert:  Pete replied 2 years ago.

My name is ***** ***** I am a professional here at Just Answer. I noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.

Check and see if the engine coolant temp sensor is sending a false signal as sometimes this can cause starting as well as running and shifting issues causing faults like this here.If this is checked and found o.k. or was already checked and found o.k. let me know so we can continue.

Thanks Pete