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Have you had any luck figuring this out? I am experiencing a similar problem on my C2 race/track car. Happens at fairly low speed and not under heavy braking. I just installed a new clutch with light weight flywheel and am using slicks for the first time.
Does anyone believe that this would be much different utilizing the 996 Motorsport AOS
LostSouth posted a topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)'03 996 C2 A little background of the path to where I am now. New to me vehicle of about three weeks. Took in for emissions and failed the readiness test. I'd only put a 150 miles on the car and had the battery disconnected the weekend before to charge it. Made sense, so I drove it to work to put some additional miles. Drove another 30 miles and got a CEL (P0507, P0171, P0174). Did some reading and cleaned the MAF as instructed. Drove it for another 45 miles and same codes. Did a little more reading. Took off the air intake (Fabspeed) and check for any cracks or tears (nothing). Cleaned the throttle body (not much there, but cleaned what was there). Re-assembled everything. Next morning drive it to work and start getting a surge at idle (1200-1800 rpm). It even feels a bit like it surges when I am on steady throttle at speed (maybe psychosomatic). A couple other things, when I cleaned the throttle body I removed the the two screws that hold the plate and pulled the plate out to make sure everything was cleaned well. I'm fairly certain it went back in correctly, as there are two tabs and two screws that make it nearly impossible to reinstall it incorrectly. I did note that the oil filler tube had been cut and joined together with a piece of rubber tubing. It had pulled apart when I pulled off the air intake. Of course I re-attached it as it was found. I mention this because in another posted about surging idle there was concern that all the vacuum hoses were properly attached and that even the oil filler cap was on tightly. Any ideas. I've taken it to a local indy who is stumped as well.
Bringing this up again. The coupe and the cab are not the same. Anyone know the answer for the cab before I break something. I have the '09 C2S Cab also
Glad I logged on to read this. Just picked up my '09 S two days ago and had the same questions. It takes me about six months after buying a used car before I'm comfortable that every nuance isn't a mechanical problem that I overlooked pre-purchase.