Unfortunately I don't own a a TVR
- but this forum seems to be the place where a lot of knowledge is held regarding the Rover V8/14CUX ECU, so I hope it's ok I'm asking for help anyway, as I'm getting pretty desperat.
I have a RRC with a brand new Turner Engineering 3.9 V8 long block just fitted - and I'm a lot of problems with hot idle. Startup and cold idle is fine, as well as normal driving - but when hot, idle gradually gets worse and worse and the lambda figures are not that far off it seems to me, but when iddling hot, the lamda figures raises to 18-22 (where the lamdba gets out of range), and the engine nearly stalls.
It has gasflowed performance heads, a H180 Sports torque camshaft, and stainless steel headers and 3" exchaust system - all brand new. It's a non-cat 1990, so in order to see whats happening I've put on an Innovate LC1 wideband lamba connected to a Innovate MTX-L gauge.
I'm not big mechanic myself, but have read a lot on the subject - all of the testing and fitting has been done by proff. mechanis, but specific 14CUX experts appears to be non-existant here in Denmark
While trying to take some of the old parts out the equation, the following has been exchanged for new parts, testing it at along when fitting it:
The AFM, fuelpressure regulator, stepper motor, fuelt temp, water temp, and injectors are all new. Crank-case breather has been checked and all components of the PCV system has been changed too.
Brake Cleaner/Diesel starthas been sprayed directly onto the various joints around the plenum - with no change in rpm - so no clue of false air as far as we can detect.
The throttle heater pad is not removed. The T-piece of the PCV system has still got the small restrictor in place.
The Ignition system is a programable 123Iginition electronic unit, running a very modest ignition curve. This was fitted with brand new Magnecor HT leads and an genuine Land Rover coil.
AFM is set to 1.3V, TPS is set to 0.35V, Fuel pressure is set to 40 psi.
Would it help increasing fueling on hot idle via a Mark Adams chip or a Megasquirt ? - or would that just cause more problems ?
I'm running out of ideas