Mechanics

99 GRAND AM: ROUGH IDLE, AND MISFIRE

1999 All Other Makes All Other Models

I have a 99 grand am SE and its been in the shop so many times I cant count. It was misfiring and they replaced a fuel injector but its still misfiring. It misfires when I leave the car for an hour and start it up. It misfires for 15-20 secs and then quits and runs ok. I have no idea what could make it do this? Leak in an oil pump? Idk?

there is also a vaccum leak I think. Its the line connected to the pcv valve. If you follow the tubing from the pcv valve to where it connects to the throttle body, it has a run off emission tube that runs towards the back of the engine but it isnt connected to anything. I dont know if its supposed to be left like this or if it is supposed to connect to another line?
It definately has a vaccum suction when the car is started.

Can anyone please help me? Thanks : )
AD
Avatar
Warbeaver
April 26, 2007.




Well I figured out the vaccum leak, im just trying to figure out the misfire now.

It misfires when it sits for an hour. Its loosing some antifreeze but it has to be internally cuz none is leaking out at all.

Tiny
Warbeaver
Apr 27, 2007.


AD