i'll try to keep this simple so it makes more sense. this started leaving my dyno tune appointment. car dyno'd, drove great off the dyno. i headed home, 15 miles in the car does 2 big surges like i let off the gas and got back on. instantly after, my pedal becomes irresponsive. i look at my wideband and it is pegged out RICH. i push in the clutch and the car is dead. won't re-start for 10-15 minutes. the dyno shop comes to help me since i just left, we replace a TFI module and i drive it the next 75 miles problem FREE.
next time i drive the car, i'm going to work. i do not feel a miss, but i see my wideband peg out full rich as im coasting to my work driveway. coming home that afternoon, i get one miss and then a pegged rich wideband. i notice that i can duplicate this RICH condition, if i hit bumps with the passenger side tire.
the car will just DUMP fuel and not rev when it goes rich over the bumps. so with that info, i start hunting and looking for a solution. let me update with what it does NOW. the rich condition has disappeared, even when i hit bumps. the car will drive around fine, but if i go to get on the gas, it has no power and backfires. it is running LEAN now.
i have done the following; 2 different known working distributors, my original maf and another test maf which came up faulty instantly via CEL, gone over wiring to; maf, ecu, distributor for cracks/breaks, checked timing, checked fpr diaphram, swapped out 2 different ecu's with and without my sct chip, gone over ANYTHING i can think of.
now the car runs lean. i have tried unplugging things to isolate the maf, different ecu, ect. i am out of idea's here, desperation mode. what do you think could cause huge issues like this?
i have NO CODES. car is a h/c/i car, vortech si trim, 42's, pro-m maf, manual, a9l and a9p ecu's, sct chip written for the a9l ecu. dyno tune went great. this started as a miss, then went to a rich condition, now its another issue.
next time i drive the car, i'm going to work. i do not feel a miss, but i see my wideband peg out full rich as im coasting to my work driveway. coming home that afternoon, i get one miss and then a pegged rich wideband. i notice that i can duplicate this RICH condition, if i hit bumps with the passenger side tire.
the car will just DUMP fuel and not rev when it goes rich over the bumps. so with that info, i start hunting and looking for a solution. let me update with what it does NOW. the rich condition has disappeared, even when i hit bumps. the car will drive around fine, but if i go to get on the gas, it has no power and backfires. it is running LEAN now.
i have done the following; 2 different known working distributors, my original maf and another test maf which came up faulty instantly via CEL, gone over wiring to; maf, ecu, distributor for cracks/breaks, checked timing, checked fpr diaphram, swapped out 2 different ecu's with and without my sct chip, gone over ANYTHING i can think of.
now the car runs lean. i have tried unplugging things to isolate the maf, different ecu, ect. i am out of idea's here, desperation mode. what do you think could cause huge issues like this?
i have NO CODES. car is a h/c/i car, vortech si trim, 42's, pro-m maf, manual, a9l and a9p ecu's, sct chip written for the a9l ecu. dyno tune went great. this started as a miss, then went to a rich condition, now its another issue.
