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CIS hard cold start and idle
Hi all, I know these CIS topics are talked about ad nauseam, but it seems everyone has a paticular circumstance with these systems.
The problem I am having is that my car starts hard when it is cold, starting only happens when my foot is to the floor on the gas, without it it seems like its flooding (rich). Once up to temp the car idles fine and starts fine again without any throttle manipulation. I followed Joe Engineers youtube video to tune the closed loop lamda system using an ocsiliscope and dialed in the FV duty cycle to spec (45-65%) at a healthy idle of 900 rpm. Timing is on checked multiple times. Once warm car pops out of the exhuast when blipping throttle. Popping does not occur when under heavy acceleration, but pops an extreme amount under deacceleration and engine braking. What gives? I am led to believe mixture is in spec from my instruments but clearly something is off.
Car Spec: 82SC 3.0 JE 9.5 pistons
964 cams
SSI exchangers and dansk sport muffler
New CIS airbox, hoses, vacuum lines, injector sleeves and orings, new FV and WUR, new TTS and 15 and 35 degree switches. Pulling o2 wire makes the car run significantly worse.
To me it seems that the car is too rich at cold start and lean when warm. Confirmed no vacuum leaks with smoke test and oil cap removal. Also to note in isolating varibles when tuning I will turn mixtutre screw rich when warm adjust idle , drive, and pops decrease, turn lean and pops increase in severity, no pops coming through the air box pop off valve. Any help is greatly appreciated! cheers.
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