1984 GMC DIESEL STARTING PROBLEMS

  • Tiny
  • jmhambright
  • 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

Do you
have the same problem?
Yes
No
Wednesday, August 24th, 2011 AT 1:20 AM

8 Replies

  • Tiny
  • mhpautos
  • Expert
  • 30,598 posts

What colour is the smoke? Black or white?

Was this
answer
helpful?
Yes
No
Thursday, August 25th, 2011 AT 7:45 AM
  • Tiny
  • jmhambright
  • Member

The smoke is whitish gray

Was this
answer
helpful?
Yes
No
Thursday, August 25th, 2011 AT 6:49 PM
  • Tiny
  • mhpautos
  • Expert
  • 30,598 posts

This can be due to low compressions causing incomplete combustion, do a compression test.

Was this
answer
helpful?
Yes
No
Thursday, August 25th, 2011 AT 10:31 PM
  • Tiny
  • jmhambright
  • Member

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.

Was this
answer
helpful?
Yes
No
Friday, August 26th, 2011 AT 12:08 AM
  • Tiny
  • mhpautos
  • Expert
  • 30,598 posts

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

Was this
answer
helpful?
Yes
No
Friday, August 26th, 2011 AT 2:32 AM
  • Tiny
  • jmhambright
  • Member

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.

Was this
answer
helpful?
Yes
No
Friday, August 26th, 2011 AT 3:18 AM
  • Tiny
  • mhpautos
  • Expert
  • 30,598 posts

Lets see what the comp test shows, then we can decide on what the next step is.

Was this
answer
helpful?
Yes
No
Friday, August 26th, 2011 AT 8:05 AM
  • Tiny
  • jmhambright
  • Member

Ok thx

Was this
answer
helpful?
Yes
No
Friday, August 26th, 2011 AT 5:42 PM

Please login or register to post a reply.

Similar Questions