Help with IAC motor on 575sci
 

Can someone tell me what is the difference between the IAC Pt # 805224A03 ($180ea and the # my engines call for)) and 805224A1 (For earlier motors and $100ea) on the 575 SCI? Also I was told if I remove the "A##" from the end of the part # it will cross reference the automotive part # (Standard Motor Parts AC5 at $30). I have the serial #s that call for 2 on each motor so I will need 4 total and I want to replace them all so this cost can equate to $120 vs $720... Thanks for any help!

The 805224A1 is just the IAC motor with O-ring
The 805224A03 is the IAC motor with O-ring, screws and gasket

I believe you are correct about the interchangeability of AC5 and the Merc part, but not positive, take the part to the auto parts store and verify

https://cimg6.ibsrv.net/gimg/www.off...7a7e58c759.jpg

Thanks, This is why I am confussedhttps://cimg2.ibsrv.net/gimg/www.off...f4caade0ba.jpg

This is why I am confused.

Based on this information OM052947 and below use Part # A1 and OM0529748 and up use A03. And Sierra offers an aftermarket part for the A1 but not the A03. Lastly you will see the A1 in my pic shows the gaskets.

Took some more looking but found part of the issue. Appears from the Merc site that there are comments listed stating

Front only S/N 0M52947 and below
Front and Rear S/N 0M52948 and up

So appears you can use the A1 on the front TB only but can use the A03 on the Front and rear depending if your S/N is within range

https://cimg7.ibsrv.net/gimg/www.off...0d91878b94.jpg

Going to edit my first pic to not confuse

Yes your correct except note your s/n

It still seems there must be some difference between the two because your reference to the gasket kit is pictured with the A1 part # so it must not be the distinguishing factor between the 2 part #s. Also if it is nothing more than calling for 1 vs 2 then why does Sierra not offer an aftermarket on both displays?

Is it possible I get 2 IAC motors with the A03 Part #?

I would only be guessing, and with a guess I would expect one of two things.
Either the software for the older s/n motors would need an update if the new IAC was used
Or Merc found that the new IAC (A03) works better and in order to change it also needs the new (maybe thicker) gasket

If BAM was open on Sunday with there tech support side I would give them a call.

Are your s/n above or below the cut off?

It does list 2 where the other only listed 1, but don't know

Just found this from Walker (printed in 2012) and says on page 3, that 575sci s/n 0L306696-0M950526 use Walker p/n 215-1026,but still unable to find the A03
http://www.walkerproducts.com/wp-con...-actuators.pdf

Thanks for all your help, I will make some calls tomorrow. Just wanted to place my order asap but wanted to make sure I knew what I was doing. I do appreciate your help.

I'd call Eddie Young - he will likely advise you of Merc vs aftermarket usage/application possibilities.

I have one in my hand for the engines that use an IAC for each throttle body.

GM# 17113099
AC Delco# 217-429

I have no use for this one anymore, no longer have 575's. PM me your address and I will send it to you if you want

I always carried a spare. Funny how these would last 200K miles in a car, but won't last 100hrs in a boat

What are the symptoms of a bad IAC? My motor loads up at idle and also keeps revving when the throttle is closed for a few seconds after high rpm operation.

High idle or won't idle. Sounds like you may need an IAC and injectors. The injectors are prone to leaking and making it load up at idle