Mechanics

DIESEL STARTING PROBLEMS

1984 GMC Sierra • V8 2WD Manual • 129,000 miles

We have a 1984 gmc sierra classic 6.2l diesel when we can get it to run it smoke badly, but the problem we have it getting it to start we have put new diesel in it replaced the glow plugs, the glow plug controller, the alternator, the thing that looks like a solenoid but controls the glow plugs, both batteries twice now and used starting fluid and we cannot get it to start, also the batteries got hot last time we tried to start the truck and we then took the batteries in and replaced them both because they both had hardly any charge on them and no cold cranking amps. Could you please help us if possible. Thank you, J
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Jmhambright
August 24, 2011.




What colour is the smoke? Black or white?


Mhpautos
Aug 25, 2011.
The smoke is whitish gray


Tiny
Jmhambright
Aug 25, 2011.
This can be due to low compressions causing incomplete combustion, do a compression test.


Mhpautos
Aug 25, 2011.
If I could get it to run I will do that do you have any idea by I cant get it started by the description I gave you.


Tiny
Jmhambright
Aug 26, 2011.
A diesel will not start with low compressions, these are compression ignition engines, they rely on good compression to fire and run.


Mhpautos
Aug 26, 2011.
Ok now I understand, what can I do besides the compression test to fix this problem does this mean my engine needs to be overhauled or replaced if it is showing low compression after the test.


Tiny
Jmhambright
Aug 26, 2011.
Lets see what the comp test shows, then we can decide on what the next step is.
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Mhpautos
Aug 26, 2011.
Ok thx


Tiny
Jmhambright
Aug 26, 2011.

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