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1984 GMC diesel starting problems

Tiny
JMHAMBRIGHT
  • MEMBER
  • 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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Wednesday, August 24th, 2011 AT 1:20 AM

8 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
What colour is the smoke? Black or white?
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Thursday, August 25th, 2011 AT 7:45 AM
Tiny
JMHAMBRIGHT
  • MEMBER
  • 5 POSTS
The smoke is whitish gray
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Thursday, August 25th, 2011 AT 6:49 PM
Tiny
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This can be due to low compressions causing incomplete combustion, do a compression test.
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Thursday, August 25th, 2011 AT 10:31 PM
Tiny
JMHAMBRIGHT
  • MEMBER
  • 5 POSTS
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.
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Friday, August 26th, 2011 AT 12:08 AM
Tiny
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A diesel will not start with low compressions, these are compression ignition engines, they rely on good compression to fire and run.
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Friday, August 26th, 2011 AT 2:32 AM
Tiny
JMHAMBRIGHT
  • MEMBER
  • 5 POSTS
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.
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Friday, August 26th, 2011 AT 3:18 AM
Tiny
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Lets see what the comp test shows, then we can decide on what the next step is.
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Friday, August 26th, 2011 AT 8:05 AM
Tiny
JMHAMBRIGHT
  • MEMBER
  • 5 POSTS
Ok thx
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Friday, August 26th, 2011 AT 5:42 PM

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