Ok heres a few of my current problems and i don't really know where to begin searching for the problem....

My car has always run rich, mainly for safety reasons but at idle it is way too rich. I get anywhere between 11.7-12.2 AFR at idle. Sometimes the car will idle at 1,500 rpm with an AFR of 11.7-11.9 and if i Blip the throttle a few times the idle will drop to about 1,300 and idle with an AFR of 12.0-12.2. The idle is steady but i don't understand why sometimes it gets stuck up at 1500rpm with an extremly rich idle. This all happens when the car is fully warmed and being driven. I have 98,000 miles on the chassis and the engine was rebuilt at about 70,000. The car still pulls just fine to redline. Another thing that may be a symptom is that when i am decelerating in gear, if i go below 2,750 rpm i get some pretty bad surging.

Another problem is that when i am turning out of a parking lot or something, the car shakes pretty bad, like im getting wheel hop but it's not because i'm not on the gas hard or anything. I also get the Clunk everyone is talking about. Is it the differential mounts or the tie rods and toe links? It is also very difficult to start going from a stop at a light and it makes it look like i am new at driving stick. I've had this car for 4 years so driving stick is not the problem. Any ideas? Any help or suggestions will be greatly appreciated.

Mods are in Sig.

-Brent

 

Bump

Any ideas at all?

 

The whole issue with high idle and rich idle, I don't know about. AEM is not something I am too incredibly familiar with. Check out the map. Who tuned it? If you did, just check it out and make sure you didn't botch something down low in the map. If a professional tuned it, call them and ask WTF is going on. There is a point with being rich to be safe, but we're talking below 2k rpms. Somethings wrong.

The car shaking thing is exactly what you think it is. Bushing are worn, if not gone completely. Differential bushings need to be replaced probably along with all the other bushings in your suspension. My recomendation, if you are replacing the rear bushings, do the fronts as well. Remember, heim joints and urathane are your friends.

Good Luck!

--Andrew