heyy clubwrx =]
a little background info on my car, first of all. its a 2003 wrx with 41k miles on it, and it has an aftermarket uppipe, dp, exhaust system, perrin crank pulley, some sort of higher-stage clutch, injen cold air intake, turbosmart bov, sti intercooler, fuel rails, and some sort of aftermarket turbo (sorry that i dont know what manufacturer most of these are.. i bought the car this way).
it was running rich after i bought it, and stopped after the dealership put in a new o2 sensor because the old one had its wiring burned onto the exhaust.
the CEL turned back on quick, however, and when i took it back, they diagnosed it for free and here is what they printed on my invoice:
NOTE AFTERMARKET UPPIPE, FUEL RAIL INJECTORS, COLD AIR INTAKE ETC. CAR IS RUNNING ROUGH MISFIRE, NEED TO RUN LEAK DOWN, COMPRESSION TEST, FUEL PRESSURE TEST. DECARB AND VALVE ADJUST TO START HR 8.9 PT 289 TO START
they told me that there was some sort of problem with the valves (on cylinders 2 and 4? sorry im not TOO technically savvy yet -_-), the car is still running rich, and that all the repairs would cost around $1550.
do you guys have any ideas? here are the things i noticed messing up while i drive..
-it does not rev high smoothly. i let the motor warm up more than enough before pushing it, and in some gears it feels like the throttle is periodically not injecting fuel. you hear the car rev, then stop and rev again intermittently. the acceleration gets rough.
-when i push in the clutch and put it in neutral to coast to a stop, the rpms drop dangerously sometimes - to even lower than 500 rpm - then they come back up to the normal idling region (800-1000). however, sometimes the rpms just die and the car turns off, with the battery icon illuminating as if the car stalled. it has a hard time starting again after this happens. it cant be the battery because i put in a new battery just last week =/
-the car seems to run better when i am running slightly low on gas. i've noticed that it runs really well, with less of that rough acceleration and no "turnings-off" at idle, when the fuel level is around the last mark. after i fill it up, the car starts to get rough again and have bad idling control.
and also, what is it exactly when the car is running a misfire?
i'm pretty worried because they want to run a compression test..
any help at ALL would be greatly appreciated!