1985 PONTIAC BONNEVILLE

  • Tiny
  • quenticar789
  • 1985 Pontiac Bonneville
  • V8
  • 2WD
  • automatic
  • 400 miles

I just rebuilt a 305 for a 85 pontiac bonneville it ran fine for about the first 400 miles I took the vaule covers off and I noticed white smoke cmming from the left head. Then it started to come out of the left exaust and I have no clue why. And its only coming out of one side. I just took all the spark plugs out and

Monday, August 8th, 2011 AT 3:33 AM

5 Answers

  • Tiny
  • mhpautos
  • Expert
  • 29,787 posts

Are you using any coolant?

Was this
answer
helpful?
Yes
No
Monday, August 8th, 2011 AT 6:01 AM
  • Tiny
  • quenticar789
  • Member

No its just straight water. I wasnt gonna put coolant in it till I get all the kinks out of it. Could that be the reason its doing what its doing?

Was this
answer
helpful?
Yes
No
Monday, August 8th, 2011 AT 3:59 PM
  • Tiny
  • mhpautos
  • Expert
  • 29,787 posts

I mean do you have to keep topping it up.

Was this
answer
helpful?
Yes
No
Monday, August 8th, 2011 AT 10:47 PM
  • Tiny
  • quenticar789
  • Member

No its holding it fine. I did a compression test and on the side its smoking from the first piston is reading around 20 to 25 psi and all the other ones are reading around 60. So should I go ahead and take that piston out or can you think of something else that could cause that piston to be so low?

Was this
answer
helpful?
Yes
No
Tuesday, August 9th, 2011 AT 2:52 AM
  • Tiny
  • mhpautos
  • Expert
  • 29,787 posts

Pull the head and check the valves especially the exhaust valve, a leak down test will determine exactly where the leak is, that is if you have access to this equipment.

Was this
answer
helpful?
Yes
No
Tuesday, August 9th, 2011 AT 8:14 AM

Please login or register to post a reply.

Similar Questions