Hello my name is Joseph I got a 1995 Pontiac Sunfire with 4 cylinder 2.2L engine with a 3 speed transmission… Here for about a couple of months there’s been some severe hesitation every time i tried to take off or accelerate .. (WORSE when the engine is at normal temp) and it seems like its getting worse. When the engine is cold it will run fine.
When the car get’s to normal temp and I try to accelerate the engine seems like its not getting enough power and acts like its gonna stall then once i get going it comes back and runs fine but every time i stop at a traffic light or stop sign and go to accelerate it does that its gonna stall type.. So for I’ve tested the TPS I’ve took a part the intake and cleaned it.
Checked all vacuum lines and no leaks, changed the fuel filter and ran a fuel pressure test (40 PSI it tested) unplugged the O2 sensor drove it and made no difference so i plunged it back in, and Changed out the EGR Valve, put sea foam into the gas and ran it threw my vacuum lines( to try to break up any carbon).. I’m outta options and I don’t know where else to look for this hesitation problem and I’m scared to drive it anywhere anymore cause i don’t know if its just gonna die and I’m not gonna be able to start it again… any ideas would be awesome… Thanks Joe
Hey there Joe,
I know you checked it BUT my gut tells me you probably have lack of fuel pressure when this happens. Fuel pump failure on these vehicles is pretty common. I would look harder at lack of fuel control for this problem.