When trying to adjust the IAC by the way decribed in the tech section, my car idled at about 1200 rpms with the connector unplugged. With the connector in it idles at a sloppy 600 rpms (not very strong). Also, my clip on the side of the IAC connector is broke and when I turned the ignition to run it made a humming noise and when I pushed in on it the humming stopped. Anybody ever had any of these problems? Any help would be greatly appreciated.
Thanks.

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1990 Formula 350
*Hooker Headers
*Random Technology 3" Exhaust(no cat)
*Accel AFPR
*K&N
*Airfoil
*170* Thermostat
*Metco Lower Control Arms
w/ Lowering brackets
*F-Body Perf. Panhard Rod and Strut Tower Brace
*1999 16x8 Formula Wheels
*White Face Gauge Overlays

 

did you adjust your tps at the same time? it's best if you do them together. I think the idle from the factory is somewhere around 500rpm so 600 really isn't that far off. You need to replace that plug. Just get one of those tools to let you slide the wires out of the broken one and get a new one from GM. Just make sure you remember what goes where!


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Dan
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87 IROC-Z, 6.7 $uperram & cam, Eagle 5.7" rods, Dart 200cc Iron Eagle heads, auto w/ BTE 3000stall lockup, 3.27, leather, !cat, Holley fpr, K&N'S, SLP 1-3/4" headers, Edelbrock lower intake, Holley 52mm tb, Dynomax\Flowmaster catback.

1987 Camaro Z28 - 5.2tpi, auto, 3.73s, ram air, airfoil, ported plenum, !cat, !tbcoolant, !smog, !4th gear - FOR SALE

1989 Pontiac 20th Anniversary Turbo Trans Am - 161,000 miles, !cat, 9" K&N - SOLD

 

Thanks for the info.
But I want my car to idle a little higher, like 650 to 700. And what about the car idling at 1200 with the IAC unplugged? It is supposed to be at like 450 or something. What is going on there?
And I am pretty sure the 90-92 TPS is self adjusting so I didn't mess with that.

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1990 Formula 350
Hooker Headers, Random Technology Exhaust w/ no cat, K&N, Airfoil, AFPR, MSD 6A Ignition, Performance Resource chip, Metco LCA's w/ brackets, F Body Perf. Panhard Rod and Strut Tower Brace, A 3.08, open, drum rear end installed by previous owner (good choice), 1999 Formula Wheels, White Face Guage Overlays

 

you are right the 90-92 is self adj.(non adj)

 

I think with the IAC unplugged it supposed to idle high, mine does atleast

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90 IROC 5.7l (L98)
ram air, K&N's, air foil, full exhaust

LIKE A ROC

http://members.nbci.com/IrocZgarage/home.htm

 

You did jumper the ALDL, put it in diagnostic mode, turn the key on, (not started) and let it sit for 30 seconds, right? That will put the IAC all the way extended so you can manually adjust the idle.

[I have an '88 so I'm not sure your is the same]

Or, something is not letting your throttle plates close completely?

Or, you not really turning the torx screw?

Just some guesses!



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_ ___ _
SMasterson