Hello all, I recently purhased a 91 Civic sedan DX for the whopping sum of $200.
The brakes need done, but this will be my daily driver after it's repaired, and it's only got 130K miles on it.
I'm not unfamiliar with EFI systems, so don't hold back on the technical info.
My question is this:
This civic was parked by a neighbor when it started to get cold, say anything under 50 degrees. It had trouble starting, and won't hold an idle well.
Symptoms:
Won't idle properly when cold, motor is choking. lightly stepping on the accelrator will allow you to start. It will die when put in gear.
All of this suggests to me a sticking IACV, but I have cleaned and verified that it is opening and closing properly.
I have adjusted the TPS, it did not change the behavior.
Are there any coolant or intake air temp sensors tat could be causing this?
It is directly related to temperature.
Thanks for the help, hope to become a contributing member after I get this thing on the road.
Edit:
I forgot to mention that once the motor warms and goes into closed loop it behaves properly.
I read the FAQ at the top of the page and read about the coolant driven automatic high idle thingy, and I will investigate that this weeken, but I'm looking for any other opinons and insights.

 

could be the tandem control valve or the coolant temp sensor or the MAP sensor

 

I'm not familiar with a tandem control valve, I'll use that search term. Thank you.

 

OK, Spent some time with the Civic.
Mechanically everything in the TB seems to be working.
It seems as though the ECU is keeping the IAC in the wrong position.
I'm going to investigate the temp senders and the rest of the engine sensors next.
Can anyone point me in the direction of some good info on these senders? Specifically what they're supposed to Ohm out at for a given temp.

 

just so you fellas don't think I'm a complete n00b.
The ride the civic will replace as my DD:

That's my 87 Jeep Comanche (MJ), 4 inches of lift, cut fenders, 34" tires, detroit locker.
It's my toy.