Mechanics

PONTIAC BONNEVILLE COOLANT PROBLEM

1996 Pontiac Bonneville

Engine Mechanical problem
1996 Pontiac Bonneville 6 cyl Two Wheel Drive Automatic 113232 miles

1996 bonneville will not start has gas fire on plugs. Long term fulel -5.5% ignition timing adv -7.0 po300 code
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Bigjoetwo2
September 17, 2008.



Does it have injector pulse? I have seen some of those Pontiacs with the 3.8 rot out the upper intake manifold around the EGR and fill the intake with coolant causing no-start conditions and random misfires, is coolant mysteriously diappearing?

Tiny
Jack42
Sep 17, 2008.
Yes but not in the oil put on new water pump
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Tiny
Bigjoetwo2
Sep 19, 2008.
The leak I am refering to doesnt put coolant into the oil, it goes into thec ylinders and wets the plugs causing misfires and no-starts. Have you checkced for fuel pressure? GM pumps are great for only lasting about 100k

Tiny
Jack42
Sep 20, 2008.

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