91 8V hard start long cranking on hot soak. cold great

[fixkick]

Here's my PLAN. i haven't touched it YET...work + weather + laziness but I have the Standard Gasket -0ring kit!!!
yes and vacation is first. im in south america. yah!


1. check ohms on coolant AND intake air sensors just to be sure not skewed (no check engine lite but...) ecu can only see open ECt OR SHORTED.
I can't see way off calibration, biased wrong. eg. 150f reads 180 or 180 reads 150F. it is clueless , like lemmings off the cliff


2. visually check injector after 3 key on engine off cycles for drippages lol usually its the o-rings that crack and drip this old.
3. make sure DP is retracting, then throttle plate is CLOSED 99.9% (throttle cable OR PO butchery)
4. tear off TBI, see if gaskets are sucked in?? and check IAC water lines for pluggage, then test IAC HOT
closed????? probably in hot water or oven!! I see it hard to use the clay when running, hot haha
but maybe plug with silicone plug on stick?
I have some powder coating plugs maybe I can make fit!!
I used to have a GM TBI plug that you stuck into similar port to check..
the iac , ways and means, it can be looked at but the screws (3 on side love to stick) and the clay trick or pan of hot water, trick,



5 if that is all ok, renewed etc.. can i check duty cycle of IAC/air bleed ADJUSTMENT with a meter?? 6 VDC??
I'm not sure i have a meter?? DWELL meter??? hmmm
how do you set the duty cycle to 50%

if lucky a DC voltmeter will average the 200 HZ pulses to 1/2 of 14.7vdc running,1/2 battery volts.
some meters are blind to 200 hz. or dead, or just read wrong. (if its a fast sampling DMM it has a great chance of reading 7vdc.
it id looks ok, set the bleed to 7v,
if you have a huge air leak, you turn the bleed and cant get 7v you get 14v because the ECU seens say 1200 rpm hot, and ISC is fully closed and
it can close more, locks there or hunt the throttle. (some do , some dont, base on what firmware is running)
there are DMM with duty meter mode.
and all scopes do this easy.

a normal engine has no air leaks
so the ISC has full control at all times
then you (or factory) SET the bleed to 50% 7vdc average of this A.C square wave.
this means , now the isC IS IN the middle of its range. and can lower idle say 400 rpm (50% less air)or raise it about that or 50% more air.

when you see crazy highHOT RPM's that means the ISC has lost control or ecu is limphome or backup mode.

you locking good. on track

good luck.