What could be making my Bonneville not run?

Asked by Jul 17, 2016 at 06:14 PM about the 1990 Pontiac Bonneville

Question type: Maintenance & Repair

My Bonneville starts but runs very rich for a few minutes, then seems to get
itself worked out of it, runs good for about 2 minutes and then completely
quits. The only code the computer is saying is for a vacuum leak but I just had
all the intake gaskets replaced and hoses checked. And it does the same cycle
every time you try to start it - runs rich - to being okay - to quitting. So far
we've replaced the battery, intake gaskets, crank sensor, MAF sensor and map
sensor. The fuel pump and alternator were both tested as well. Anyone have
any suggestions as to something we might be overlooking? This has all of us
stumped...

2 Answers

74,015

Bad fuel injector,s.

1 people found this helpful.
78,075

Or a bad fuel pressure regulator. The fuel pressure regulator controls fuel pressure based on a vacuum signal from the intake manifold. There should be a vacuum hose going from the fuel pressure regulator to the intake manifold. Sounds like the vacuum hose is hooked up to throttle body vacuum which is different and will cause the fuel pressure regulator to not work correctly. HTH. -Jim

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