Turbo 400 trans, Starts and idles great, on C16, drag only, and A/F is good until it reaches around 4K RPM and then goes dead rich 8:1 range. Totally stumped on this. Plugs are gapped at .019 so don't think its spark blow-out, new plugs, has been through a few shops before coming here. On the the track same thing. Launches awesome and then falls on its face pig rich. Can share log and tune with anyone interested in studying this.
A few things were not sure on, it has 7 O2 sensors instead of the normal 2 upstreams. So that we have not figured out either what the rest are doing as there is no wideband gauge in the car. We have the AEM sensor in a bung for logging. Par throttle is good A/F.
Any ideas?
Thanks in advance.
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