I don't know where to post this so I am putting this here. I hope it will help someone and maybe save them some time, money and frustration. I have a 92 Camaro rs stock lo3. The problems started last weekend on the way to a car show. Car started just fineand we left town, as I was going down the highway I noticed engine was running at fast idle. the longer I drove the worse it became. It got to the point where it was idleing at about 1800 going down the road. Still made the 75 mile trip to the show but it took a lot of fuel. No service engine light, oil pressure and coolant temp were fine. Car idled about 1100 in drive, foot on brake, about 1700 - 2000 in park. Made trip home, pulled off air cleaner and fuel was just pouring into tbi while at idle. I was in process of looking for vacuum leaks when I bumped driver side AIR hose and the check valve broke off the pipe, pipe as burnt through but had not noticed leak previously (forgot to mention car has 124,000 miles). Went to GM dealer to get parts AIR pipe is a discontinued item now but they found one in a warehouse in Des Moines. Got parts next day and stopped to talk to a local mechanic. He said Pipe would not cause fast idle. That I should keep looking for vacuum leaks. Suggested throttle body to intake gasket. Took it to a friend of mine who has a shop, had him replace pipe first (I always say fix one thing at a time). No change. Found a cracked vacuum T, changed it, no change. Decided to pull throttle body and change gasket, again no change. Ended up changing iac and tps, still no change. Next step I could think of was pulling the intake and changing gasket. thankfully I decided to wait.
Frustrated beyond belief I decided to just take it home and think about it. I didn't want to tie up his shop stall any longer. I came home cussing under my breath, because my wife still isn't sure I really need my toy. So I sat down at my puter, got on here (thirdgen. org of course and started searching and reading and doing more reading and more searching. Then I came across something on here that caught my attention, sorry but I can't remember the post or who posted it, but it mentioned the CTS by the thermostat. So I searched some more. After about 4 hours of searching on here I had an idea. I don't have equipment in my garage to test sensors, so I went out to the garage started up the car and pulled the wire off the cts, no change but my service engine light came on. I pushed the wire back on and the car died? what the hell. I reached in, turned the key and it started right up. went and wiggled the wire and car died. I pulled the wire looked at connector and one of the pins was corroded and had broken off in the connector. Stopped at parts store after work yesterday, picked up new cts and connector, came home, installed it and car idles at 800. Took it out for road test, ran beautifully.
So any way $35 worth of parts and 20 minutes would have probably fixed my problem right away. I hope someone finds this info helpful to them. I realize I am pretty lenghty on my description and I appologize.

 

Glad ya got it fixed. I'm always recommending cts sensors

 

Thanks for the info! Remember reading something about CTS causing driveability issues as well.

 

Excuse my ignorance, but what cts stands for?

 

Coolant temp sender, not for the gauge, but for the ECM.

 

Thanks!

 

would this cause the car too not idle in ger