03-25-2015, 09:22 AM
sorry , the vsv's are open, with key off, oddly true.
smoke setting is very tricky, even the exh. pipe and will smoke (one exh valve during intake valve at exh overlap period near TDC. end of exh stroke this happens
the leaky pcv might a tad too, it's got a tiny spring there ,that only allows sucking, from crank case to intake, its probably just old and leaking a tad.
Hunting, or surge.:
that is odd, sounds to me like its lean and hunting. there.
a natural(sic) lean hunt. (all gas engines do that leaned out too much)
so, is the scan tool slowing that its in , closed loop at idle.?
and 2000, in neutral/park it must? same? it must. (stead right foot)
plus:
and LTFT, not way off?, long term fuel trim ( -5% is normal for LTFT, ) if why plus % LTFT, may be dirty MAF or ail leaks (vacuum)
The maf is nautral +5%, the EFI system, removes that 5% and you get STOICH AFR. causing LTFT at -5% , the system sucks out the natural maf error.
at accel and w.o.t. the trim is dead, and only the MAF wins. (AFR)
that hunting is not the ISC< the ISC is disabled off idle. like that.
so is lean, i bet, but the scan tool will tell you, if the front 02 is good, and no exhaust leaks near front 02, that is.
nice work using a smoke machine, lots of fun that.
best is to start with a fresh 02, front and scan it. watch all sensors. and trim.
smoke setting is very tricky, even the exh. pipe and will smoke (one exh valve during intake valve at exh overlap period near TDC. end of exh stroke this happens
the leaky pcv might a tad too, it's got a tiny spring there ,that only allows sucking, from crank case to intake, its probably just old and leaking a tad.
Hunting, or surge.:
that is odd, sounds to me like its lean and hunting. there.
a natural(sic) lean hunt. (all gas engines do that leaned out too much)
so, is the scan tool slowing that its in , closed loop at idle.?
and 2000, in neutral/park it must? same? it must. (stead right foot)
plus:
and LTFT, not way off?, long term fuel trim ( -5% is normal for LTFT, ) if why plus % LTFT, may be dirty MAF or ail leaks (vacuum)
The maf is nautral +5%, the EFI system, removes that 5% and you get STOICH AFR. causing LTFT at -5% , the system sucks out the natural maf error.
at accel and w.o.t. the trim is dead, and only the MAF wins. (AFR)
that hunting is not the ISC< the ISC is disabled off idle. like that.
so is lean, i bet, but the scan tool will tell you, if the front 02 is good, and no exhaust leaks near front 02, that is.
nice work using a smoke machine, lots of fun that.
best is to start with a fresh 02, front and scan it. watch all sensors. and trim.
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