Question about 1994 Pontiac Bonneville

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Motor surges while idioling, if you step on the gas it goes away. Also the car stalls while braking around 30 miles/hr. It restarts right away. Have already changed sparkplugs and wires and egr valve, this has not corrected the problem. Any sugestions?

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  • Pontiac Expert
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Hello! The most likely culprit is the Idle Air Control Valve (IACV)...Has a 4 wire connector...Colors are...Light Blue/White...Light Blue/Black...Light Green/Black...And Light Green/White...Check connector for dirty contacts, loose or broken wires...It is more than likely fouled with carbon...Remove and clean port and tip...If cleaning does not cure the fault IACV needs to be replaced...Guru..........saailer

Motor surges while idioling, if you step on the - 0f22c18.gif

Posted on Sep 11, 2010

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  • Pontiac Master
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Check the brake booster for a leaking diaphram. With the engine running in park, stick your head under the dashboard and listen near where the brake plunger goes into the engine compartment while pressing the brake pedal with your hand. If you hear a hissing-air sound, your booster is leaking and letting excessive air into the engine. The booster can be replaced with about 1-2 hours labor. Check online for cost of the booster unit. Any questions, please reply.

Posted on Sep 11, 2010

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