Starts and idles but runs like crap
 

1997 GMC 3500 6.5 Power Diesel Truck starts and idles but when pedal is applied it spits, sputters, smokes white...IP replaced at 80,000 miles, turbo-booster replaced at 160,000 miles, PMD was moved when IP was replaced. Truck is now at 173,000 miles. Have tried draining the tank, put a new fuel filter in. Can anybody help me out?

sounds like you might have a head gasket issue

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pull the dipstick and if it looks like it has a chocolate milk color to it, its probably that, also some other symptoms to check for are oil in the overflow tank, sometimes that will happen,bubbles will sometimes come back thru the radiator too with the engine running, pull the radiator cap and check for that. To me it sounds like a blown head gasket already tho

First all are you getting any codes

make sure the Lp is working buy putting 12V right to lp see how it runs , it also could be bad PMD

whats a pmd?

oil is fine no bubbles in radiator sometimes it will smooth out but not for long

do the 2000 rpm test

:scare2:need help my truck runs good untill you press gas pedel wont go over 2000rpm and smokes white please if you can help i need it 1997 gmc 3500 6.5

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does my 1997 gmc 6.5 have a egr and where is it thanks for the help:humm:

Well Trish1 if it 97 truck you should be setting of SEL what are the codes to help you

i am not getting any codes in my obd2 no check eng light:s:

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:argh:need help still having the same :bat:

does it go away once your truck is warmed up? kinda sounds like a ip though

no i pulled the air filter and truck ran perfect so put a new fram in and started it again will start and idle ruff at first then smooths out ontill you aply gas pedel took new filter out and no change please help and thanks for replying:dang:

is this on every start or just cold start

what are RPM at idle

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i just went back reading you post check PMD harness and it could be PMD going bad

every start an around 600 rpm

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my pmd was moved before i got truck on top of intake when i start the truck the pmd gets hot used a ez tech lazer to see how hot around 200 deg f why and should it be engine is not hot at all only ran for maybe 5 min when i checked the temp of the pmd

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and once again my power is back what the hell is going on

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now back to runing like shit:scare2::bat::argh::argh::argh::argh:

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crazy help me i am going crazy:s:

getting any codes

no i wish

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:pca1:

starting sound like bad PMD and did you check and clean all grounds

i see your PMD on the intake witch still not good place and is the PMD still grounded to top of the IP


do know anyone with spear PMD you can try

:w2:

This does sound like a pmd issue. I would get a long harness, the four foot one and move it behind the bumper with a good heat sink.