I have a 1986 IROC-Z28 305 TPI.The prob that i'm having is that when I start it hot or cold the idle go's up relly high and I have to wait 3 to 5 min for it to go down so I can put it in gear.I've done everything that I can think of to fix the prob.The new part's that I put in are: TPS,IAC,CAP,ROTOR,TEMP SENSOR,I checked all my vac line's,and had my fuel injection system checked and it's okay.I don't know what to do now this has been going on for far to long it's been 3 month's that i'v been fighting with it...Please help Thank's Frankie

 

If I were you I'd go look in the tech articles section of the main site, and do the IAC reset procedure. Most then likely that's what your problem is.

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92 Z28 L98 350
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Ported stock heads, XR270HR-10 cam, TES headers, Crane AFPR, Flowmaster catback, MSD ignition components.

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I did that it diden't help.thank's

[This message has been edited by Viper702 (edited December 07, 2000).]

 

Well things that I know that can speed up and idle to high. Timing beinbg set to far in advance, vacume leaks arount the intake track can cause this big time, and sticking throttle bores. Ok for the timing, check it, the procedure is in the tech atrticles. For intake leaks do this, before the car gets warm get a can of carb cleaner and spray a light bit around where ever there is a gasket and listen to see if the idle picks up, if it does there is a leak there. If your throttle bores are sticking ,you would notice this driving it that sometimes you have to tap under the gas to get the gas completly off, you just have to live with it or buy a new TB. Most likely it is a leaking gasket I would try that route first


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86 Trans Am 355 TPI Rebuilt 700R4 with Corvette servo, modified valve body, and a B&M Torque Converter (2000 rpm stall w/ lock up), 87 350 block bored .30 with new crank, bearings, rings, and magnafluxed rods. Reworked 305 heads with 3-angle valve job. Added in the rebuild was an SLP TPI cam, BBK 58mm Throttle Body,SVO 24# injectors,MSD 6A, Hypertech Power Coil, 1.5 Crane roller tipped rocker arms, SLP Intake Runners and Port matching in upper intake including fully ported plenum, TPIS adjustable fuel pressure regulator @ 46psi, Hooker shorty style headers w/ Thermotech heat wrapping, Custom 3” exhaust with Flowmaster muffler and chrome quad tips, Hypertech Thermomaster Computer chip, K&N open element cone filter on modified MAF per TPIS specs, MSD Wires, removal of A/C hardware and a 1LE firewall cover installed. Also there has been a PST front suspension kit with Hotchkis strut tower brace
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Have you tried cleaning the IAC passage ways out?. Just a carb cleaner type operation

 

Thank's for the help.I've checked for leaking gasket's with carb cleaner and the timing okay,and I have also cleaned out the tb and all passage's.The idle will go down in time as it's running but I shouldn't have to wait for it to do so...Thank you Frankie

 

How about the throttle body? Are the blades closing all the way. Mine used to trip every once in a while and a shot of WD 40 or just plain motor oil where the sping is was enough to fix it. It might have something to do with metal expanding when engine is warm, therefore loosening up and bringing the throttle down. just a suggestion

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'88 GTA 350
Headers, catback, free mods, Xtreme energy cam, intake pieces and 2100 RPM TQ

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You know what that's a great suggestion,now that I think of it I don't think they do.I think there tiped a bit.I seem's to me that the prob started after I cleaned out the TB with carb cleaner,I know that sound's weard but I think that might be it.Thank's i'll let you know...Frankie