Discussion
Scenario - long but please help!!
Rebuilt 4.2 engine by V8Devt and refitted with original AFM, Inlet, injectors, tune, etc.
MOT'd - Low CO & highish NOx. The boys set the CO to 2.5 (richened).
When I test drove it it was missing on accel and woundn't idle. Boys tweaked the air bypass for the idle (it's on it's end stop now) now idles when hot but not when cold.
Did 59 miles home - used it again today and after an 8 mile round trip stalled and wouldn't restart. King lead was loose and after a feckle and mess around for a couple of hours started again. This evening I've fired her up to put her in the garage she ran - misfiring as she's cold then turned round on the drive and she's stalled and won't restart.
Help is urgently needed as this is my only transport at the moment!!
TaS
Rebuilt 4.2 engine by V8Devt and refitted with original AFM, Inlet, injectors, tune, etc.
MOT'd - Low CO & highish NOx. The boys set the CO to 2.5 (richened).
When I test drove it it was missing on accel and woundn't idle. Boys tweaked the air bypass for the idle (it's on it's end stop now) now idles when hot but not when cold.
Did 59 miles home - used it again today and after an 8 mile round trip stalled and wouldn't restart. King lead was loose and after a feckle and mess around for a couple of hours started again. This evening I've fired her up to put her in the garage she ran - misfiring as she's cold then turned round on the drive and she's stalled and won't restart.
Help is urgently needed as this is my only transport at the moment!!
TaS
NHyde said:
Over fuelling , mine is stuck in Exeter with exactly the same thing !!!!!!!!!!!!.............poxy little silver box on the inner wing
That would be the power resistor pack? I don't see how that would cause overfuelling. If one or more resistors went open-circuit, those injectors wouldn't fire. If the resistors went short-cct (highly unlikely as they're printed tracks) then the injectors would receive too much current and burn out.
Ian
at BBWF !
If overfuelling when cold disconnect the cold start injector lead.
Mine runs too rich as I run a rising rate fuel pressure regulator, the airflow meter bypass is on the end stop AND I have a little pipe bleeding in extra air to get the CO down.
If you remove the vacuum pipe for the dizzy so it bleeds in extra air and it runs better, go down that route.
Mine runs too rich as I run a rising rate fuel pressure regulator, the airflow meter bypass is on the end stop AND I have a little pipe bleeding in extra air to get the CO down.
If you remove the vacuum pipe for the dizzy so it bleeds in extra air and it runs better, go down that route.
Sounds like the vacuum pipe for the fuel regulator is inoperative, this will give full fuel pressure at idle and cruise, i.e no rising rate .
The 420SEACs all had stage 4 heads as standard, but normally had standard ECUs (vittesse) if modified there is a good chance that somebdy like Mark Adams has worked on it, he modified the ECU in my SEAC, standard ECUs work but you need to raise the fuel pressure accordingly, something you can do with the flapper system , ECU chips are not relevant to these pre hotwire (flapper injection) cars
I agree that you should disconnect the cold start injector, was the cam changed ? as this would completely change the fuelling requirements at idle.
Tim
>> Edited by 2 sheds on Sunday 9th May 13:47
The 420SEACs all had stage 4 heads as standard, but normally had standard ECUs (vittesse) if modified there is a good chance that somebdy like Mark Adams has worked on it, he modified the ECU in my SEAC, standard ECUs work but you need to raise the fuel pressure accordingly, something you can do with the flapper system , ECU chips are not relevant to these pre hotwire (flapper injection) cars
I agree that you should disconnect the cold start injector, was the cam changed ? as this would completely change the fuelling requirements at idle.
Tim
>> Edited by 2 sheds on Sunday 9th May 13:47
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