the old engine and parts. old TBI.
might have been running in limphome (suzuki failsafe) mode for years, (most are this old) or running real poorly.
then with a working TBI starts running like a new car and scares the owner. seems it would to me...
the cold started engine does race idle real fast , by design.
it does. the master books do do not document this, only that it is controlled by the wax pellet in the IAC, (discounting dash pot , idle run up and retraction)
case in points:
ISC jammed closed with gunk, (low RPM)
sot the mechanic, opens the bleed, to hide this error.! this extra air adds to the IAC air, cold started, and it will RACE fast cold.....
then a new TB is installed, and the Dutycycle not set! i bet....
nor checking spark timing,
nor checking TPS calibration (its ok, yours is closed at idle)
what is HOT RPM with the ISC electric air hose pinched (not water)
this test i do on all EFI engines.
to see just how many air leaks (vacuum) I have.
yours should stall, or run at about 400 rpm and shake hard.
might have been running in limphome (suzuki failsafe) mode for years, (most are this old) or running real poorly.
then with a working TBI starts running like a new car and scares the owner. seems it would to me...
the cold started engine does race idle real fast , by design.
it does. the master books do do not document this, only that it is controlled by the wax pellet in the IAC, (discounting dash pot , idle run up and retraction)
case in points:
ISC jammed closed with gunk, (low RPM)
sot the mechanic, opens the bleed, to hide this error.! this extra air adds to the IAC air, cold started, and it will RACE fast cold.....
then a new TB is installed, and the Dutycycle not set! i bet....
nor checking spark timing,
nor checking TPS calibration (its ok, yours is closed at idle)
what is HOT RPM with the ISC electric air hose pinched (not water)
this test i do on all EFI engines.
to see just how many air leaks (vacuum) I have.
yours should stall, or run at about 400 rpm and shake hard.
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