yes,
the ECU controls idle speed HOT , it's an EPA law that. (unless malfunctioning)
tests must be done, before replacing parts.
the ecu is hard coded for 800 RPM , every one,, not just yours,.
the first step, is the tps idle switch it must be closed.
if not, all this is a wasted effort, if the switch is not closed, idle will vary all over the place because , idle controls are now dead.
you proved its dead, now only why matter.
TPS idle switch tops that list. i bet it was never set when replaced, i bet the mech, don't even know it must be done,
on newer cars you set this TP angle at 0.5v (1.8 L and bigger) (this method got rid of the switch) hoorah.
on even newer cars, the ECU auto learns this step. Cheers to that.
idle controls are active only at idle, never driving, the ECU knows you desire idle , only by lifting your right foot and the idle switch closes, and the idle servo system , activates.
yours is not.
it's that simple. (there are other causes but this one is the most primary reason)
other causes"?
EGR stuck open
gross retarded cam
gross retarded spark timing.
or a dead cylinder.
or 80psi compression, (a near dead engine)
ECU in limphome (CEL on full time)
on all engines, idle controls are the LAST to work right.
when tuning a custom ECU, it's the LAST step. in a long process.
the ECU controls idle speed HOT , it's an EPA law that. (unless malfunctioning)
tests must be done, before replacing parts.
the ecu is hard coded for 800 RPM , every one,, not just yours,.
the first step, is the tps idle switch it must be closed.
if not, all this is a wasted effort, if the switch is not closed, idle will vary all over the place because , idle controls are now dead.
you proved its dead, now only why matter.
TPS idle switch tops that list. i bet it was never set when replaced, i bet the mech, don't even know it must be done,
on newer cars you set this TP angle at 0.5v (1.8 L and bigger) (this method got rid of the switch) hoorah.
on even newer cars, the ECU auto learns this step. Cheers to that.
idle controls are active only at idle, never driving, the ECU knows you desire idle , only by lifting your right foot and the idle switch closes, and the idle servo system , activates.
yours is not.
it's that simple. (there are other causes but this one is the most primary reason)
other causes"?
EGR stuck open
gross retarded cam
gross retarded spark timing.
or a dead cylinder.
or 80psi compression, (a near dead engine)
ECU in limphome (CEL on full time)
on all engines, idle controls are the LAST to work right.
when tuning a custom ECU, it's the LAST step. in a long process.
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