[crimson_king]

hey guys, so i have been having a very hard time diagnosing what exactly is causing random misfires on my celica, i have a 2000 gts, only engine mods are a trd intake and trd exhaust with stock headers. so the car was throwing a p0171 lean code but i fixed that with two new o2 sensors and a new maf and now the only problem is the p0300 code and black smoke out of the exhaust along with black "soot" dripping/spraying out and the strong smell of gas. m afraid my cat is going to give out (or already has) due to all of the unburnt gas, also i just took the spark plugs out the other day and they were covered with gasoline and smelt of it too, im thinking it may be an issue with the fuel pressure not letting the spark pugs spark at random times, but i checked it and fuel pressure was at 45psi... any help much appreciated thanks

 

[crimson_king]

i really appreciate the replies guys, my car is also having trouble with acceleration and doing the same thing your car is doing silver_streak, i would suggest replacing the plugs? maybe? may be even the maf.. thats what helped my lean code and the thing is, with y car, i bought a brand new coil and switched it around and when i put it in cyl 1, it still misfired and it even showed a mifire in that same cylinder as the new coil, im beginning to think this is a computer related problem as well? im not even sure anymore, btw, i just rebuilt my engine at 60k miles and it has about 61k on it now, i did a full valve head job and crank job and replaced two pistons as well, but i remember this misfire problem even before i redid the engine, it was doing the same thing.

 

[crimson_king]

thanks, i think that would be a good idea, do u know how to do about checking their power? is there a certain method?