Question about 1990 Oldsmobile Eighty Eight

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Can't adjust fast idle - 1990 Oldsmobile Eighty Eight

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Could be TPS sensor,but you can adj. set screw at bottom throttle body move CCW.

Posted on Apr 29, 2013

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Posted on Jan 02, 2017

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5.8 idle speed adjustment


In the past, adjusting an engine idle was easy. Manufactures have removed these adjustments on modern vehicles. The power control module or PCM now determines the speed at which an engine idles. The idle is controlled by the Idle air control. Remove and clean it out, it may be sticking, and making a fast idle. but if not done correctly, it can result in even worse idle issues. You can clean it with throttle body cleaner. Clean all the carbon from it, do not push on the pintle if it has one. Hope this helps you! God-Bless!

May 08, 2017 | Cars & Trucks

1 Answer

Correct fast idle


Check this link for fast idle adjustment.

Edelbrock Carburetors Troubleshooting Fast Idle Adjustment

Also check out the following link for details about the adjustment:

Pages 22 23 Choke Fast Idle Speed

Feb 12, 2015 | Cars & Trucks

1 Answer

Idle adjustment


need clarification I dont know what vehicle you own. Most vehicles made since the 90's or so have no idle adjustment. It is computer controlled.

Aug 23, 2012 | Cars & Trucks

1 Answer

Idle adjust


It should have a base idle adjustment and could also have an idle speed control motor.
The base idle screw should be on the driver's side of the carb. You would also have a fast idle screw on the choke.

Aug 23, 2012 | Cars & Trucks

1 Answer

How do I adjust throttle cable on 1989 chev c2500 to raise idle speed throttlebody injection


Can't adj..clean your IAC. Idle Air Control valve, or possibly replace it. The Computer adj's you idle by this valve moving in and out, it gets carboned up and does'nt move like it should.

Feb 13, 2012 | Chevrolet C2500 Cars & Trucks

1 Answer

My car, an xjs 4lt, 1996 cele', it has a aj16 engine, the idle speed is too fast & will not reduce, i've checked the butterfly & that seems ok, i don't know whether or not the step...


Too fast an idle speed. If an engine without computerized idle speed control is idling too fast and refuses to come down to a normal idle speed despite your best efforts to back off the carburetor idle speed screw or air bypass adjustment screw (fuel injection), air is getting past the throttle somewhere. Common leak paths include the carburetor and throttle body gaskets, carburetor insulator spacers, intake manifold gaskets, and of course, any of the engine's vacuum fittings, hoses and accessories. It is even possible that leaky O-rings around the fuel injectors are allowing air to leak past the seals. Another overlooked item can be a worn throttle shaft and a defective idle speed speed control motor/valve stuck in the extended (high idle speed) position/throttle position sensor. Also the throttle plate could be binding in its bore and kinked accelerator cable, coolant temperature sensor might not be operating properly misleading the computer that the engine is still cold and computer throwing fuel at it raising the idle speed.----------

Getting this possibilities checked will help.Thanks.Helpmech.

Aug 31, 2011 | Jaguar XJS Cars & Trucks

1 Answer

What kind of carb does the 76 c10 4x4 come with need to adjust


mcdevito75 here, The fast idle is needed when the engine is cold to make the air and fuel mixture rich to keep the engine running while cold, the carb. choke doew this with a bi-metalic spring in that balck round box on the side of the carb, a screw also hepls keep the choke closed until warm up, this screw can be adjusted tpo control how tight it holds the choke cloesed, here"s how to adjust this screw to slow fast idle speed, Locate on the carb, where the gas pedal connects, have a friend operate the gas pedal with the engine off, once you locate the linkage, you"ll also see 2 screws with springs around them, 1 is for fast idle the other for regular idle, you want the fast idle screw, notice this screw will lay against and Half moon shaped tab, while the other screw lays against a shaft, you need the screw that lays against the half moon shaped tab. Start the engine and step on the gas pedal slightly and relaease, at the screw that lays against this half moon, simply turn it counter clockwise or toward you just 1 2 or 3 turns very slowly, you'll hear the fast idle come down but you don"t want the fast idle to low, listen to the engine very carefully, slow it down just a bit, it should still race though but not out of control. Of course for a full carb, adjustment the shop should handle that., but this info will help.

Mar 29, 2010 | 1978 Chevrolet C1500

1 Answer

1979 cj replased carb idles tohigh


Even with a rebuilt carb you have to make the adjustments. Check the choke adjustment and set the fast idle. If choke is to tight it will be hard to start and take a long time to idle down. The fast idle sounds like it is high also.

Oct 01, 2009 | 1983 Jeep CJ7

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