03-12-2022, 03:06 AM
DP can be like 3 seconds hot engine to 30 or tad more super cold. but the ECT must work or the ECU has no idea at all what to do.
ECT at 300ohms resistor at hot engine 180f, stop engine pull plug to ECT (has locks) and is measured 300ohms,. (about) check cold to against my ECT table.
IAC dead is huge pain.
yes IAC provides allmost all air for cold starts ( and TV a tiny bit) when it dies IAC stuck up cold starts scream if stock closed floods unless driver right foot adds some.
the DP is mostly for burning up all that pooled liquid fuel on super cold starts. under the TB plenum box (small) it can be like lake of fuel and nasty smog as result.
but is also part of cold start up air
the ECU sadly is hard coded in memory ECU for assumed, air flows, at cold start then when map wakes up gets smarter (tons). at idle and up to WOT
so the air flow is DP +IAC + TV small leak = idle cold air start. DP is open cranking, he delay is after engine idle rpm shows running.
The IAC is thermal no ECU controls but is done by proxy it uses ECT to model The IAC, It knows air flow in IAC at all temps from Icelandic temps to to 150f and IAC .
the ISC wakes up (electr) at 150f adding more air.
ECU knows DP (performance) as it runs that, fully. at all times (VSV)
it is not easy to do this, but I sure would, using a valve or a set of orifices/ valves (solenoid) I can choose.
1-_ no air hot.
2: not cold air.
3: fridge air. orifice.
or buy a generic IAC and run it off an Arduino AVR and program it to ECT temps. (AVR connected to ECT) summit racing dot com has generic IAC. for race cars.
I do feel your pain here, it is not easy to outsmart any ECU but not insurmountable.
cheers too you !
ECT at 300ohms resistor at hot engine 180f, stop engine pull plug to ECT (has locks) and is measured 300ohms,. (about) check cold to against my ECT table.
IAC dead is huge pain.
yes IAC provides allmost all air for cold starts ( and TV a tiny bit) when it dies IAC stuck up cold starts scream if stock closed floods unless driver right foot adds some.
the DP is mostly for burning up all that pooled liquid fuel on super cold starts. under the TB plenum box (small) it can be like lake of fuel and nasty smog as result.
but is also part of cold start up air
the ECU sadly is hard coded in memory ECU for assumed, air flows, at cold start then when map wakes up gets smarter (tons). at idle and up to WOT
so the air flow is DP +IAC + TV small leak = idle cold air start. DP is open cranking, he delay is after engine idle rpm shows running.
The IAC is thermal no ECU controls but is done by proxy it uses ECT to model The IAC, It knows air flow in IAC at all temps from Icelandic temps to to 150f and IAC .
the ISC wakes up (electr) at 150f adding more air.
ECU knows DP (performance) as it runs that, fully. at all times (VSV)
it is not easy to do this, but I sure would, using a valve or a set of orifices/ valves (solenoid) I can choose.
1-_ no air hot.
2: not cold air.
3: fridge air. orifice.
or buy a generic IAC and run it off an Arduino AVR and program it to ECT temps. (AVR connected to ECT) summit racing dot com has generic IAC. for race cars.
I do feel your pain here, it is not easy to outsmart any ECU but not insurmountable.
cheers too you !
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