most of these OLD cars even 32 years old now.(89)
the IAC is bad, the wax pellet inside goes bad and collapses and leaks air. ( the WHY)
just like the wax pellet does in the thermostat in its housing coolant, at 10 years old. (for same aging reasons)
The IAC lasts way longer , 20 years or so....
there is no easy cure, new TB are not sold now, only hacks possible.(or used dead TB from ebay even worse)
or the air hose trick per poster. (simple for sure and effective) thanks for sharing, !
one could program and Arduino computer to modulate a new , generic IAC, but finding one is not easy , they are used in racing, but oops found one.
Idle Air Control Valve for BMW 325e
https://www.amazon.com/ROADFAR-Control-P...435&sr=8-3
the problem is what are the coils inside, is this a solenoid like Suzuki or 2 way motor with 3 pins, I do not know. and must be known
there are 3 kinds of IAC (ISC in our case) in truth we only need 1 ISC not 2,(IAC+ISC) suzuki failed to do that and used 2. (excuse is slow ECU then)
1: solenoid IAC (ISC) suzuki type now.
2: motor pairs as seen on EGR electric motor on 1996 J18 engines up.
3: stepper, as seen on my 88 jeep,4.0L
I know of only 3 kinds. but I think the below is #2 (100 % self contained, , no TB needed at all or wanted)
If I still had my 91' 8v and the IAC died, I'd be all over this, at midnight, oil time.
![[Image: 536_iac-basic.jpeg]](https://fixkick.com/forum/gallery/536_iac-basic.jpeg)
the IAC is bad, the wax pellet inside goes bad and collapses and leaks air. ( the WHY)
just like the wax pellet does in the thermostat in its housing coolant, at 10 years old. (for same aging reasons)
The IAC lasts way longer , 20 years or so....
there is no easy cure, new TB are not sold now, only hacks possible.(or used dead TB from ebay even worse)
or the air hose trick per poster. (simple for sure and effective) thanks for sharing, !
one could program and Arduino computer to modulate a new , generic IAC, but finding one is not easy , they are used in racing, but oops found one.
Idle Air Control Valve for BMW 325e
https://www.amazon.com/ROADFAR-Control-P...435&sr=8-3
the problem is what are the coils inside, is this a solenoid like Suzuki or 2 way motor with 3 pins, I do not know. and must be known
there are 3 kinds of IAC (ISC in our case) in truth we only need 1 ISC not 2,(IAC+ISC) suzuki failed to do that and used 2. (excuse is slow ECU then)
1: solenoid IAC (ISC) suzuki type now.
2: motor pairs as seen on EGR electric motor on 1996 J18 engines up.
3: stepper, as seen on my 88 jeep,4.0L
I know of only 3 kinds. but I think the below is #2 (100 % self contained, , no TB needed at all or wanted)
If I still had my 91' 8v and the IAC died, I'd be all over this, at midnight, oil time.
http://www.fixkick.com