94zLT1

heres my symptoms...problem is definately fuel related..i am going to run a fuel pressure test but i would like some opinions..car has 100K on the odo..i think its the pump but also maybe bad injector(s)...after sitting a while the car is resistent to start..it turns and turns and after about 5 sec it will start and run perfect...NEVER done this b4 in all 100K miles on it it has always fired right up on the first turn...now it is seriously struggling to start...today i let it turn for like 7 sec then it didnt start but i tried again right after and it fired up...idle is smooth and great..all part throttle and driving is perfect..from my logs though it seems at around 4200 and up it is leaning out bad..but only on the drivers side? it leans a little on the pass but a lot on the drivers side? maybe pump giving out at high load? what would make the car hard to start and then have NO problems whatsoever untill high rpms?

slopokrodrigez

The next time you try to start it after it has sat for a long time try this. Turn the key on KOEO for 2 seconds and then off. cycle the power like this 4 or 5 times. Then finally try to start it. If it starts up quickly, the test shows the fuel is draining away from the fuel rail. If so, there is usually 2 causes. A hole in the FPR diaphragm or the check ball in the fuel pump. If the FRP were bad the vac hose going to it would be wet but it would make you run rich.