IAC Problem

**Blue2KTA** · 05-21-2010, 02:19 PM

I removed the IAC to clean it and to make sure it was working. When i turned the key to the on position to see if it would move the threaded shaft unscrewed itself and popped off the valve, spring and all. I put the spring and shaft back into the valve and turned the key on, it then threaded itself back in. So i bolted it back on but when i started the car it would stall right away. I removed the valve again held it in my hand, while the key was turned on then off. The shaft moved up and down. I bolted it again and the car started normally but when i turn the car off while touching the IAC i can feel a vibration like it the shaft wants to move but it can't, then stops (almost like motor spins but the shaft can't go anymore). Do i need a new IAC ?

**Too Fast** · 05-21-2010, 04:34 PM

If your car starts and idles/runs normally now, you are probably ok. Some cars have their IAC reset when you turn the key off, if could be normal. I don't know for sure if our LS1s do.

**Blue2KTA** · 05-21-2010, 04:43 PM

I just took it out for a drive and everything seems normal. I just have to see how a cold start is tomorrow.

**Too Fast** · 05-21-2010, 04:47 PM

I'm driving my car tomorrow. If I remember, I'll check the IAC operation when I shut 'er down.

**Blue2KTA** · 05-21-2010, 04:57 PM

Originally Posted by Too Fast

I'm driving my car tomorrow. If I remember, I'll check the IAC operation when I shut 'er down.

Thanks

**Too Fast** · 05-22-2010, 12:40 PM

Yes that's what the IAC does on shut down, resets itself on shut down. Sounds like you are ok, now spend some $$$ on something else that needs cleaning LOL.

**Blue2KTA** · 05-22-2010, 02:17 PM

Thanks for checking

Just did the seafoam in the intake the other day. Didn't get smoke while doing it but got alot when i drove it.

**Street Fighter** · 05-23-2010, 03:42 AM

Originally Posted by Too Fast

I'm driving my car tomorrow. If I remember, I'll check the IAC operation when I shut 'er down.

Just what is this IAC that is being talked about?

**Too Fast** · 05-23-2010, 04:04 AM

Originally Posted by Blue2KTA

Thanks for checking

Just did the seafoam in the intake the other day. Didn't get smoke while doing it but got alot when i drove it.

If your engine has primarily used good gas (a top tier brand like Shell V-power) you may not notice much difference with the seafoam. If you see a big difference in the way it runs, now you know why.

Originally Posted by Street Fighter

Just what is this IAC that is being talked about?

IAC = Idle Air Control motor. This is what the PCM uses to control the idle speed on F-body LS1s. A lot of cars are going with drive-by-wire now, so they don't have IACs anymore, these cars have other problems like the car will only idle when a sensor F's up. I'd rather have my cable operated throttle, thank you.

**Blue2KTA** · 05-23-2010, 05:00 AM

Originally Posted by Too Fast

If your engine has primarily used good gas (a top tier brand like Shell V-power) you may not notice much difference with the seafoam. If you see a big difference in the way it runs, now you know why.

IAC = Idle Air Control motor. This is what the PCM uses to control the idle speed on F-body LS1s. A lot of cars are going with drive-by-wire now, so they don't have IACs anymore, these cars have other problems like the car will only idle when a sensor F's up. I'd rather have my cable operated throttle, thank you.

I always use premium Chevron gas. The idle seems a little rough while waiting at a light so i did the seafoam and cleaned the IAC. I have 55k on the clock.

I totally agree with you about the drive-by-wire cars. We had a 2006 Impala that had it and it sucked. There would be lag on acceleration that was real annoying and the dealer said it was normal.

**Too Fast** · 05-23-2010, 08:57 AM

Originally Posted by Blue2KTA

I always use premium Chevron gas. The idle seems a little rough while waiting at a light so i did the seafoam and cleaned the IAC. I have 55k on the clock.

I totally agree with you about the drive-by-wire cars. We had a 2006 Impala that had it and it sucked. There would be lag on acceleration that was real annoying and the dealer said it was normal.

Drive-by-wire.

Just another government conspiracy! It's their way to control how you drive your car, instead of you driving your car how you want to. This is also why I like my 6-speed, I control it instead of the automatic transmission contolling my gears.

**Street Fighter** · 05-24-2010, 02:26 PM

Is seafoam really safe to use? I have heard some say stay away from it , unless you plan to change your oil after it's use. will it really help? I ask this because I have stayed away from using anything in my engine other than oil.also just what is it good for?

**Street Fighter** · 05-24-2010, 02:33 PM

I have a mildew smell in my TA and I was wondering if the ac drain was stopped up.where is it located and how can I get the smell out of the car.

**pajeff02** · 05-24-2010, 02:35 PM

Seafoam: This had been a long standing debate on here. Some swear by it and some swear at it. I don't think there is any question that Seafoam is a solvent, probably a harsh one considering what it does. I would not use it on our car -- rather I employ the TC-W3 additive and if the need ever arose I would probably use Auto Rx as an engine cleaning agent.

**Blue2KTA** · 05-24-2010, 06:51 PM

Originally Posted by Street Fighter

Is seafoam really safe to use? I have heard some say stay away from it , unless you plan to change your oil after it's use. will it really help? I ask this because I have stayed away from using anything in my engine other than oil.also just what is it good for?

I only used the Seafoam spray in the intake. I personally will not use it in the oil.