So as some of you may know, I recently posted a thread with questions about turbo-ing my M20 E30. Well that’s done. Had to overcome some hurdles, and your answers to my last thread made that possible.
hot everything installed with the exception of injectors, fuel pump, ECU, and M50 TPS. Started the car with the freshly installed turbo and it ran and idled fine. Making sure everything was fine, I then installed the stuff I just mentioned.
towed it to the dyno tuner. He got the car started and creeped up on boost. However, car was misfiring/sputtering on the dyno. So he wasn’t able to tune for full boost. I got sent home to fix the misfiring issue then go back on the dyno.
The dilemma I have now is, I cannot for the life of me, find out the culprit. I just replaced my 7 spark plugs to 8s. Gapped them to .020 as the tuner suggested. Replaced the plug wires with IE 8mm
ones. New Bremi distributor cap and rotor. Coil is a Bosch I replaced about 2k miles. Maybe worth it to mention, it is running on E85. I also do have an exhaust leak at the manifold which I will address tomorrow morning, but I’m not sure if that would cause the issues I’m having.
Driving on surface streets, accelerating, seems to be ok. The issues is at steady throttle and RPMs. More so on the highway. Cruising at 70 at 3k RPM, it starts sputtering/misfiring. After about 10-15 minutes of highway driving, it’s sputters really bad. No acceleration or power. When this happens, if I give it any kind of throttle, it just backfires out the exhaust without going anywhere. It almost feels like car hits spark cut or something. I’m stumped.
I hope I was able to throughly explain the symptoms.
I’m thinking it might have something to do with the TPS even though I’m pretty sure I did the wiring correctly.
hot everything installed with the exception of injectors, fuel pump, ECU, and M50 TPS. Started the car with the freshly installed turbo and it ran and idled fine. Making sure everything was fine, I then installed the stuff I just mentioned.
towed it to the dyno tuner. He got the car started and creeped up on boost. However, car was misfiring/sputtering on the dyno. So he wasn’t able to tune for full boost. I got sent home to fix the misfiring issue then go back on the dyno.
The dilemma I have now is, I cannot for the life of me, find out the culprit. I just replaced my 7 spark plugs to 8s. Gapped them to .020 as the tuner suggested. Replaced the plug wires with IE 8mm
ones. New Bremi distributor cap and rotor. Coil is a Bosch I replaced about 2k miles. Maybe worth it to mention, it is running on E85. I also do have an exhaust leak at the manifold which I will address tomorrow morning, but I’m not sure if that would cause the issues I’m having.
Driving on surface streets, accelerating, seems to be ok. The issues is at steady throttle and RPMs. More so on the highway. Cruising at 70 at 3k RPM, it starts sputtering/misfiring. After about 10-15 minutes of highway driving, it’s sputters really bad. No acceleration or power. When this happens, if I give it any kind of throttle, it just backfires out the exhaust without going anywhere. It almost feels like car hits spark cut or something. I’m stumped.
I hope I was able to throughly explain the symptoms.
I’m thinking it might have something to do with the TPS even though I’m pretty sure I did the wiring correctly.
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