Extremely rough take off
Thread Starter
6th Gear
Joined: Feb 2022
Posts: 6
Likes: 2
Extremely rough take off
I've been going through the rabbit hole of fixing all the problems on the 93 C4 and have been able to crack all the other issues I've had except this one. When taking off from a dead stop after driving for a couple minutes it sputters, bucks, backfires and just falls on its face. It will eventually "catch" and then drive totally normally until stopping again then rinse and repeat. I took a log file with DataCat and exported signals that seemed appropriate to csv. Can someone take a look and see if they can find what I'm missing? It happened a couple of different times during the test drive but the most prominent were around frames 3000 to 3060. If different signals are needed they can be exported. I tried to directly upload the DataCata file but it wasn't accepted as an attachment.
In the process of fixing other issues with the car I've since replaced plugs and wires, coil, ICM, fuel filter and injectors. Found both O2 sensor wires melted in half so they were also replaced.
Really stuck on this one and could use some help. I've watched the hi and lo res signals from the opti through a oscilloscope and they seem to be fine, but that doesn't mean the cap and rotor portion of it are ok.
In the process of fixing other issues with the car I've since replaced plugs and wires, coil, ICM, fuel filter and injectors. Found both O2 sensor wires melted in half so they were also replaced.
Really stuck on this one and could use some help. I've watched the hi and lo res signals from the opti through a oscilloscope and they seem to be fine, but that doesn't mean the cap and rotor portion of it are ok.
