07-28-2023, 11:39 PM
Iac , is on bottom of TB throttle body 100% thermal device
the iSC is on facing engine right side of intake plenum bolted to it. and wired.
takes lots of driving to set many DTC codes,.P0300./
i bet the injectors are Filthy , how can they not be, they have 10micron screens inside, 4times smaller than the fuel filter. in fact.
in a pinch, try CHEVRON injector cleaner , for the gas tank, it has powerful benzine in it to clean those nasty injectors. (just chevron, other use, useless crap)
800rpm shows ISC and IAC are ok .
if IAC leaks rpm goes crazy high
ISC can be cleaned, easy. to make sure it is free of all gunk.
yes EGR like to leak and EGR is closed at idle fur sure. thus the clunk word. sure. but if CARBON IS THERE ON THE OLD NASTY SEAT IT WOULD CLOSE QUIETLY.
NEW EGR MAIN, WILL CLUNK
THIS ECU IS NOT VERY SMART , IT MAY SET p0171/2 ? FOR LEAN BURN. 171 IS LEAN. (OR P0300 CODES)
DO THE SCANS SHOW CLOSED LOOP MODE AT HOT IDLE?
MUST.
THE EGR CAN BE BYPASSED, FOR TESTING JUST MAKE UP A GASKET THAT IS CLOSED, 100%, BINGO NO EGR AND NO WAY TO MESS UP IDLE NOW.
NEEDS PRIMING TOP START YOU SAY?
COLD STARTS the PCM sees ECT cold, and sets the proper injection rates off real engine temps. rich.
and starts and runs easy if spark plugs not bad.
if not try using 5% right foot throttle to start the engine this add air to simulate a dead IAC><<< means IAC stuck closed dead. no cold start air.
the iSC is on facing engine right side of intake plenum bolted to it. and wired.
takes lots of driving to set many DTC codes,.P0300./
i bet the injectors are Filthy , how can they not be, they have 10micron screens inside, 4times smaller than the fuel filter. in fact.
in a pinch, try CHEVRON injector cleaner , for the gas tank, it has powerful benzine in it to clean those nasty injectors. (just chevron, other use, useless crap)
800rpm shows ISC and IAC are ok .
if IAC leaks rpm goes crazy high
ISC can be cleaned, easy. to make sure it is free of all gunk.
yes EGR like to leak and EGR is closed at idle fur sure. thus the clunk word. sure. but if CARBON IS THERE ON THE OLD NASTY SEAT IT WOULD CLOSE QUIETLY.
NEW EGR MAIN, WILL CLUNK
THIS ECU IS NOT VERY SMART , IT MAY SET p0171/2 ? FOR LEAN BURN. 171 IS LEAN. (OR P0300 CODES)
DO THE SCANS SHOW CLOSED LOOP MODE AT HOT IDLE?
MUST.
THE EGR CAN BE BYPASSED, FOR TESTING JUST MAKE UP A GASKET THAT IS CLOSED, 100%, BINGO NO EGR AND NO WAY TO MESS UP IDLE NOW.
NEEDS PRIMING TOP START YOU SAY?
COLD STARTS the PCM sees ECT cold, and sets the proper injection rates off real engine temps. rich.
and starts and runs easy if spark plugs not bad.
if not try using 5% right foot throttle to start the engine this add air to simulate a dead IAC><<< means IAC stuck closed dead. no cold start air.
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