Question about 1993 Chevrolet G20
Changed the Throttle Position and it is still high - Checked for vacumn leaks, what can I do next?
SOURCE: I have a 88 chevy
is the check engine light on ? if it idling high chances are you have a vacuum leak take a can of carb cleaner and spray the egr valve and if the engine rpm changes replace egr valve the throttle body may also be plugged pull the vacuum line off the map sensor start vehicle and see if you have vacuum if not remove throttl body and clean vacuum passage hope this helps
Posted on Oct 05, 2008
SOURCE: 1995 Chevy G20 stalls.
Not sure if this will help. I have seen this happen!!! remove the cover under the steering column and locate the ignition switch. Get a flash light. You really need a flash light to see this. Set the E-Brake real good. While watching the ignition switch. (actual SWITCH not where the Key goes) . Turn the key back and forth with out starting and see if the switch is loose. (it has 2 hex head screws in it ) and is like 4 inches long with a bunch of wires in it and mounted the passenger side of the column under dash. If you cant see it move then try removing it from park and see if it moves. The switch is mounted on slotted holes. and if it is loose it will only move with the legnth of the column or front to back of vehicle. any ways if it is loose there is a way to put it back right ... as fallows:
key needs to be in the off position. loosen screws 1/2 turn each,
use your finger to push the switch up towards the key but not force it. like pushing a key on a key board. Tighten both screws and check it out. This seems like a long process to go through but it costs nothing but time.
Posted on May 04, 2009
A vehicle that old will suffer from brittle and cracked vacuum lines. I would say there is a bad, or several bad lines leaking away vacuum from the intake manifold. Don't forget to check the hose going to the PCV on the valve cover. A vacuum leak will also cause the engine to stumble and miss intermittently when idling.
Posted on Jun 26, 2009
check the fuel pressure to determine that the fuel pump is still good. there should be a schrader valve with a plastic cap on it on the fuel supply line that goes to the throttle body or if you have one fuel injector per cylinder, you will have a fuel rail that feeds each injector that will have the schrader valve that you screw the fuel pressure tester on. most fuel injection systems run 30 to 40 psi, but check a service manual or call a dealer to get the correct psi for your vehicle. if the fuel pressure is within specs, it sounds like the MAF (mass air flow) sensor is the culprit.
Posted on Oct 14, 2009
Check your IAC motor (Idle Air Control) It could be sticking open.
Ps. Might be called Idle Speed Control motor it depends on the make and i forget what chevy calls theres.
Posted on Mar 11, 2010
Tips for a great answer:
Oct 23, 2013 | Cars & Trucks
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
Getting this possibilities checked will help.Thanks.Helpmech.
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