Question about 1998 Pontiac Bonneville
Hello! You're symptoms sound very much like a common problem associated with the fuel pump resistor. The 3.8L Series II engine has a two speed fuel pump. There are two relays that control the fuel pump via the PCM module. The fuel pump relay and fuel pump hi-speed relay. Tied into the hi-speed relay is a fuel pump resistor that may go bad.
Symptoms vary but primarily the engine will start but die in a matter of seconds due to insufficient fuel pressure.
Here is a picture of the relay (this is the picture for a Grand Prix, but the box is the same for your vehicle) - which is located in the fuse box in the engine compartment:
What you can do to both diagnose this and either narrow it down to this or disqualify it as the culprit is remove relay #15, and bend out the tab labeled "85", and then reinstall the relay. If this does solve your problem, then you need to replace the fuel pump resistor, you can find it here. Doing this will bypass the resistor, and place the fuel pump in "high" speed mode at all times. Once you have replaced the resistor, you need to bend the tab back to its normal position and replace the relay.
NOTE: while this may be a helpful diagnosis tool, and provide a temporary fix - doing this procedure for a prolonged period of time can lead to fuel pump failure. Use this at your own risk.
Posted on Sep 25, 2009
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Posted on Jan 02, 2017
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