Jp's camaro

I have a 85 z28 305 tpi. It idles around 1400 rpm when starting and as it gets hot it rises to about 2000 rpm sometimes a little higher. I've replaced the tps, o2 sensor, fpr, coolant temp sensor, spark plug wires, distributor cap, rotor, and ignition coil. I still have the same issue tho, I'm beginning to think something is wrong with the computer

Tuned Performance

iTrader: (92)

Have you tried to do the minimum idle speed adjustment to see if the iac is moving in all the way ?

Tuned Performance

iTrader: (92)

http://www.iroczone.com/2009/10/adju...ir-idle-speed/

Tuned Performance

iTrader: (92)

Looks like there site is down. Follow this procedure.

Jp's camaro

Actually don't think I tried it that way yet. I tried setting minimum Idle but it didn't change anything

Tuned Performance

iTrader: (92)

Did it bring down the idle when commanded in ?
If not the iac might be stuck and needs to be cleaned.
The cts will tell the ecm the target rpm. The cts doesn’t necessarily have to throw a code 15 to be faulty. I assume you have checked for vacuum leaks ?

Jp's camaro

Edited my original post because I haven't tried that yet, I did clean the throttle body a bit when I changed the fpr it wasn't really dirty and changed the coolant temp sensor already. Haven't found any vacuum leaks, egr has been disconnected so I capped those vacuum lines

Tuned Performance

iTrader: (92)

It might be the ecm, you can wrap on the ecms case to see if it drops idle or surges the engine rpm. Here is a link to a 1226870 if you need it.
https://m.ebay.com/itm/1985-TPI-Cama...m_gL4TyW11TQWg

Jp's camaro

Thank you I'll try that and see if it does anything

Jp's camaro

Found out if I turn the key off and on 3 or 4 times before I start it, it will sometimes idle normal

Jp's camaro

Update: just replaced the ecm with a reman one and still having the same high idle issue and fan not kicking on. If i unplug IAC, maf, or tps it still does the same thing

Jp's camaro

Anyone ?

Pro

- Have you hooked up a fuel pressure gauge and watched it while idling, making sure it hangs out around 30psi when idling?
- Information from the ECM is helpful. Purchase some sort of scanner if you can and post data. A laptop with TunerPro RT and this:
http://www.moates.net/aldu1-and-cabl....html?cPath=64
would be very nice
If you dont want to learn tunerPro you can at least get something like:
https://www.ebay.com/itm/12-Pin-ALDL...r/272388698454
It will dump data to a CSV file as your car is running.
- Youtube is free and just about everyone has the ability to record video, so upload video when you get a chance

Jp's camaro

Haven't checked fuel pressure yet, did fix the fpr tho. Thanks for the advice and yeah I was thinking about just getting a cable so I can see what's going on but I'll check the fuel pressure first

Jp's camaro

I finally fixed the high idle issue I believe. The connector to the coolant temp sensor was somewhat broken and I believe it wasn't making a good connection. When I was testing the sensor today I messed with the connector a couple times and it began to idle down and is now at about 900 rpm