91 firebird trouble

[kingjt119]

i have a 91 firebird with a v6 3.1, for some reason gas keeps causing my spark plugs to file out but if i take them out and dry them and put them back it runs fine, but give it about 3 days and they will be to wet with gas to spark, do i have a bad injector thats just constantly leaking gas on my spark plugs, or wat is it?

[Will Help]

You have something wrong. Is this an injected throttle body carb? If so, then a single injector could soak all the plugs. If you have a fuel rail injection system, then I can't see all the plugs getting wet as each cylinder has its own injector which should affect only one cylinder. Also curious that you can go several days without the problem. Every day you run it would clear the plugs. It sounds strange to happen so erratically.

[Morley]

If it is a throttlebody injection then one injector leaking would cause the problem. If it is MPFI then a leaking fuel pressure regulator could be the cause.

[kingjt119]

it is a fuel injection system, so like u guys said sounds like a leaking pressure regulator which is probably gonna be a bitch to replace, but i was also thinking could it be a bad sensor, like the manifold pressure sensor, or oxygen sensor?

[Morley]

Originally Posted by kingjt119

it is a fuel injection system, so like u guys said sounds like a leaking pressure regulator which is probably gonna be a bitch to replace, but i was also thinking could it be a bad sensor, like the manifold pressure sensor, or oxygen sensor?

Find the vacuum hose going to the fuel pressure regulator and pull it off. If ANY fuel comes out of it, then the diaphraqm is ruptured or has a hole and must be replaced.
For an O2 sensor to cause that level of fuel saturation you'd notice a drastic reduction in MPG and should be smelling raw gas in the exhaust.

[Will Help]

Regulator is not that bad to replace. Just remember to do it when the engine is cold as you will loose some fuel when you bleed the pressure off the system. Don't want any fires do we!!! Be sure to replace any O-rings in the regulator system and use rags or paper towels under it to catch any fuel leaks.