hey everyone, i'm new to the forums. i've owned my '02 Mustang GT since she was new, and after graduating from college in december decided to finally put a blower on it. i put a Vortech on my stock motor and ran it like that for quite a while with no issues whatsoever. about 2 months ago i rolled through some high water (long story..), and since my air filter is about as low as you can imagine in the passenger front fender, it sucked water in and hydrolock literally destroyed my rods... so it was time for a rebuild. (the car was never submerged and i literally rolled right through this spot of water and came out about 2 seconds later on dry land)
ever since the rebuild, i've had trouble with a very inconsistent a/f ratio. the dyno pulls showed a solid 11.5:1, but not too long after i got it on the street i started having problems. first off, before the engine is warmed up, it idles so damn rough i have to hold the revs at 1500 rpm just to keep it from dying out. the whole car shakes, the motor sounds like *****, it literally feels like it's running on about 6 or 7 cylinders. after it's warmed up a few minutes it miraculously returns to normal.
once i get out and start driving, while cruising (cruise control, flat road with no incline/decline) my a/f holds pretty steady between 13.5:1 and 14:1, and then will randomly drop down to 11:1 (or lower). after a few minutes it'll randomly lean back out and run fine.
i can make full throttle pulls through 1st and 2nd gear, but in 3rd and 4th gear when i hit around 4000 rpm my a/f goes extremely rich (so rich my digital a/f gauge won't register it) and it literally hits a wall and just won't rev any higher. it didn't do this at all on the dyno in 4th gear. even more confusing, i put it in 4th gear and crept up on 4k at part throttle, and then mashed the throttle at 4200 and it pulled all the way to 6500 before i let off.
does this sound like a bad maf or possibly a fuel injector getting stuck open? i'm wondering if injesting the water may have ruined the maf, i've been considering getting an Abaco DBX if this is the case. is there a way to test for a bad maf or bad injectors? i'd hate to just start buying stuff in hopes that i'll pinpoint the problem that way.. i've already put enough money into it and don't want to have to spend more if i don't have to. i'd really appreciate any help you guys can provide.
ever since the rebuild, i've had trouble with a very inconsistent a/f ratio. the dyno pulls showed a solid 11.5:1, but not too long after i got it on the street i started having problems. first off, before the engine is warmed up, it idles so damn rough i have to hold the revs at 1500 rpm just to keep it from dying out. the whole car shakes, the motor sounds like *****, it literally feels like it's running on about 6 or 7 cylinders. after it's warmed up a few minutes it miraculously returns to normal.
once i get out and start driving, while cruising (cruise control, flat road with no incline/decline) my a/f holds pretty steady between 13.5:1 and 14:1, and then will randomly drop down to 11:1 (or lower). after a few minutes it'll randomly lean back out and run fine.
i can make full throttle pulls through 1st and 2nd gear, but in 3rd and 4th gear when i hit around 4000 rpm my a/f goes extremely rich (so rich my digital a/f gauge won't register it) and it literally hits a wall and just won't rev any higher. it didn't do this at all on the dyno in 4th gear. even more confusing, i put it in 4th gear and crept up on 4k at part throttle, and then mashed the throttle at 4200 and it pulled all the way to 6500 before i let off.
does this sound like a bad maf or possibly a fuel injector getting stuck open? i'm wondering if injesting the water may have ruined the maf, i've been considering getting an Abaco DBX if this is the case. is there a way to test for a bad maf or bad injectors? i'd hate to just start buying stuff in hopes that i'll pinpoint the problem that way.. i've already put enough money into it and don't want to have to spend more if i don't have to. i'd really appreciate any help you guys can provide.