DBRjeep350TPI

I have one for you guys… I have a TPI unit from an 87 Camaro 350. I did plug off the 9th injector and all to convert the unit to run with a 90-92 1227730 ECM. Well my question is on the IAC unit. I left the 87 IAC unit in and believe I replaced it with a new 87 IAC unit. I went out the other day and the engine was running a little odd, I did not hear the IAC like normal. I pulled the unit out and found the cone on the end unscrewed inside the throttle body. I threaded it back on and now seems to start and run okay, but intermittently the idle will jump from 900 to 1800-2000 RPM and smells like it is running rich and burning fuel more than usual.

I am curious if the IAC I am using is the correct one for my application?

Dose the IAC fit the throttle body per application (87 or 90-92) or should I match the IAC to the ECM/ECU being used (an 87 IAC to an 87 ECM/ECU or a 90-92 IAC to a 90-92 ECM/ECU)?

Tuned Performance

iTrader: (92)

85-92 tpi iac's are the same. I like to use the lower iac plate from a Lt1 just change the harness end or build a pigtail.

DBRjeep350TPI

So if they are the same... why are they two diffrent part numbers AC16 (90-92) and AC1 (89-older) and also the cost for the AC16 is three times as much?

You say you like to use the "lower IAC plate from an LT1" not sure what you mean? I understand to rebuild the harness.

Tuned Performance

iTrader: (92)

you could use a acdelco pt757 or accel 77651 and get the lower iac plate with iac usually on a used throttlebody on ebay for a lti. The lt1 lower coolant /iac housing bolts to a tpi throttle body. huh, looks like there is a difference the 89-92 use a iac coolant housing 17112127 the 85-88 must be different you can see the year date on yours and order the correct iac aswell.

DBRjeep350TPI

My housing/throttle body is from an 86-87... I was curious if I do use a IAC for that housing or should I use the IAC for a 90-92? I am curious is the ECM/ECU is adjusting the IAC differently?
The two IAC from 85-88 and 89-90 look identical physically, but is there some internals of the IAC that are different that the ECM/ECU might be controlling?

Tuned Performance

iTrader: (92)

might be pintle length or tip shape no sure.

Tuned Performance

iTrader: (92)

for example check the link for the throttle body, use the lower plate and iac, if you need a new iac there cheap, gasket set go to autozone and get gp sorenson 96-3008

http://www.ebay.com/itm/96-Caprice-9...#ht_500wt_1075

http://www.ebay.com/itm/ACDelco-217-...#ht_500wt_1075

DBRjeep350TPI

your awsome man!!!!
and that throttle body will bolt on directly to a 87 TPI system from a IROC?

Tuned Performance

iTrader: (92)

the throttle will bolt on but there is no provision for the 700r4 tv cable, just swap over the lower plate that the iac it attached to. I usually pull out the coolant pipes to clean up the look.

DBRjeep350TPI

I see...
One other thought. When you switch over that lower body and use the newer style IAC. Is the operating range/temp the same? I dont want to start throwing codes cause of the new sensor.

Tuned Performance

iTrader: (92)

The iac controls a vacuum leak and just moves in and out. Temperature range not sure what you mean ?

DBRjeep350TPI

Not Temp range... sorry I ment that my 1227730 ECM/ECU will read the correct signal from the new IAC valve. So it wont throw a code

Tuned Performance

iTrader: (92)

I have used it on a couple 730 with no issues. If you like a second opinion maybe ask rbob

DBRjeep350TPI

as long as you have done it and no troubles on a 7730... I believe you. just want to make sure.
thanks

Tuned Performance

iTrader: (92)

you can easily make a adapter like this !


I used a delphi 12162188 and 12015024

http://www.mouser.com/ProductDetail/...Ioj78ZJeGKE%3d

http://www.mouser.com/Search/Product...4PGCdjsA%3D%3D

Tuned Performance

iTrader: (92)

A=IAC "B" low Lt. Grn/Blk
B=IAC "B" high Lt. Grn/Wht
C=IAC "A" low Lt. Blu/Blk
D=IAC "A" high Lt. Blu/Wht

DBRjeep350TPI

Awsome... Thanks

Tuned Performance

iTrader: (92)

you owe me a cold beer. lol

Chevy86 IROC-Z

iTrader: (17)

When I go to CO (hopefully in 2013), I'll stop by with a nice little 6 pack to catch a tiny buzz. Lol

Tuned Performance

iTrader: (92)

Come on out man .

Chevy86 IROC-Z

iTrader: (17)

If it wasnt for the 1200 mile drive, I'd be right there in two shakes of a lambs tail. LOL

Tuned Performance

iTrader: (92)

the letters "A" and "B" are just referring too the coil a and coil b sorry for the confusion