2000 Pontiac firebird (3.8) won't drive properly

Asked by Mar 06, 2017 at 10:53 PM about the 2000 Pontiac Firebird Base

Question type: Maintenance & Repair

The guy I bought it from bought it from another guy
who parked it for working overseas for 7 months,
when he got back he sold it to the guy I bought it
from. He tried to start it and two feul injectors
stayed open and flooded the oil with gas. Since
then I've replaced the crank shaft position sensor,
the camshaft sensor, feul injectors, all 3 coils, the
throttle body, a part to the EVAP system and the
feul pump. It starts when you either flood it or give
it a lot of gas (really depends on how the car feels)
but it keeps stalling out. I did a fulll oil change I've
also replaced the battery. Sometimes it'll start and
run for a minute but the RPM wont stay high
enough to keep running so it stalls out. Sometimes
it takes a few cranks to start. Anyone know what is
going on?

3 Answers

75,745

When you did the fuel pump did you drain the old gas out of the tank and clean the tank? If the car was parked without a full gas tank you may have water condensation in there. You didn't mention that you replaced the spark plugs and spark plug wires. The spark plugs are probably gasoline fouled and need to be replaced. Any black smoke from the tailpipe? That is an overly rich air/fuel mixture (too much gas). Is the check engine or service engine soon light on? If so, scan the computer for trouble codes. That'll help. If you can get a fuel pressure reading while it's running that'll help. If it's excessive the fuel pressure regulator could be bad. Seven months isn't really that long for a car to sit. I suspect that the guy who parked it was having trouble with it before it was parked. My 2000 Prand Prix gets stored from January until April every year. I change the oil, fill up with premium gasoline, drive it to my storage garage, park it, and disconnect the negative (-) battery cable. In the spring it fires up like I parked it the day before, not 3 months ago. That's why I suspect a preexisting condition. Please keep us posted! HTH. -Jim

1 of 1 people found this helpful.
8,215

change the fuel filter first to see if there is any change... cheapest & basic fix first.

Today I've replaced the spark plugs and tightened down the sensors a bit more. It works a little better and it'll idle longer after it has been warmed up. The spark plug wires looked brand new. Someone told the that the mass airflow sensor shod be replaced on the throttle body. Does anyone agree?

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