Question about 1999 Oldsmobile Alero
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Posted on Jan 02, 2017
most likely idle air control sensor or low engine coolant I know sounds funny but IAC uses coolant to regulate idle. Idle air control valve or throttle body positioning sensor.
Posted on Feb 26, 2009
SOURCE: How to I set idle speed?
Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay. CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Drive ability problems may exist until computer systems have completed a relearn cycle.
IDLE SPEED & MIXTURE
NOTE: Idle mixture is controlled by Powertrain Control Module (PCM). Adjustment is not possible. After replacement of Idle Air Control (IAC) valve, system must be cycled as identified for PCM to properly control idle speed. If idle speed is not okay after cycling system, problem is usually caused by a dirty throttle plate or vacuum leaks. Ensure all vacuum components are functioning properly.
IDLE SPEED (4-CYLINDER)
Turn ignition on with engine off for 10 seconds. Turn ignition off for 10 seconds. Start engine and idle for 30 seconds. Slowly vary engine speed between idle and 3500 RPM 5 times. Return engine to idle. PCM will now properly control idle speed. 2.2L (Cavalier & Sunfire) & 2.4L (Alero, Cavalier, Grand Am & Sunfire) Good luck and hope this helps. If it still has the high idle problem, your going to have to buy a can if not two cans ot THROTTLE BODY CLEANER NOT CARBURATOR CLEANER. Just follow the instruction on the can and try to get the Idle Air Control Valve cleaned also which is on the sdie of the throttle body so go to town when cleaning the throttle body and then do the Idle speed relearn again. The other thing to is since your doing house cleaning, buy a MAF sensor cleaner and spray down your MAF sensor and IAT sensor also, this will help with your fuell consumption.
Good luck and keep me posted, be glad to help.
Posted on Jul 04, 2009
When did you last change the spark plugs, distributor cap, ignition wires, ignition coil, fuel filter, or the fuel pump? Any one of these could causing your care to stall. Also, have you been using regular gas or premium as premium gas can cause your engine to not combust properly if it wasn't designed for premium
Posted on Aug 07, 2009
I, too, have a 2000 Alero 2.4L and am having the same problem, but worse. Whenever I brake to a stop while in Drive, the engine stalls sometimes. I thought it was the torque converter going bad. I tried the cheap fixes first when fuel system cleaner and air filter. I took it to a parts store and they pulled the code. "Service Engine Soon" light came on. "Too Rich Bank 1" was on the screen of their code machine. I was thinking fuel filter on my way to the parts store, but wouldn't a clogged fuel filter make it too lean? I have cleaned my air filter and have ran two tank fulls with "Sea Foam" additive. I have had some better low-idle performance, but it hasn't cured the problem. Today I held the throttle down at 1,500 RPM in Park to see if it was running steady, and the engine began to stall! I had to let off the throttle so that it wouldn't stall. That's when the "Service Engine Soon" light came on. About a year ago, I had the fuel injectors professionally cleaned at a shop. Is the throttle actually electro-mechanical? Is there a throttle relay or servo that's going bad?
Posted on Oct 17, 2009
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