1985 pontiac bonneville

1985 PONTIAC BONNEVILLE
400 MILES • V8 • 2WD • AUTOMATIC
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QUENTICAR789
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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
Aug 8, 2011 at 3:33 AM
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MHPAUTOS
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Are you using any coolant?
Aug 8, 2011 at 6:01 AM
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QUENTICAR789
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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?
Aug 8, 2011 at 3:59 PM
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MHPAUTOS
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I mean do you have to keep topping it up.
Aug 8, 2011 at 10:47 PM
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QUENTICAR789
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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?
Aug 9, 2011 at 2:52 AM
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MHPAUTOS
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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.
Aug 9, 2011 at 8:14 AM