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low idle on 98

 
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Old 05-09-2008, 10:27 PM
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low idle on 98

can I adjust this manually, is it the flat head screw close to the idle?, car idles around 450-500
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Old 05-17-2008, 01:55 PM
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Ah, unless someone messed with it before and set it too low I would leave it alone.

Sorry I just noticed you havn't had anyone chime in to help.

There may be something that is causing the low idle, like vacuum leak, misfiring, clogged injectors. I would research and see if there is any maintanance that needs to be done first before you go adjusting the idle screw.
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Old 05-17-2008, 07:18 PM
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Their is a idle adjustment screw but if you havnt messed with it before I wouldnt play with it. Make sure you MIL light works. Turn the keys to IGN II and see if it lights up. Check the ignition timing sprak plugs and wires air filter and PCV system make sure non of it is clogged.

1. Start the engine. Hold it at 3,000 rpm with no load in neutral until the radiator fan comes on and let the car idle.

2. Disconnect the 2p connector from the idle air control valve.

3 If the engine stalls restart the engine with the axxelerator pedal slightly depressed and hold it at 1,000 rpm then slowly release the pedal untilt he engine idles

4. Check idling in no load conditions everything off radrio blowers all lights.

Your idle speed should be around 550 +- 50rpm
If not adjust the idle screw slightly and have someone watch the rpm until they fall to spec. Be sure to follow the next steps

5. Turn the idnition off

6.Reconnect the 2p connector to the IAC then remove the clock radio 7.5a fuse in the engine bay fuse box keep it out for 10 secons to reset the ecm/pcm

7. Restart and idle the engine with no load for one minute then check the idle speed.
Idle speed should be 700 +- 50rpm

8. Idle engine for one minute with headlights on low beams and check idle speed. Should be 790 +-50rpm

9. Turn off the headlights and Idle the engine with the heat fan switched at high and a/c on. Check idle speed. Should be 790 +-50 rpm
If the idle is not within these spec you need to inspec the fast idle thermal valve, intake air temp sensor

Fast Idle thermal valve inspection.
With engine cold coolant temp below 86 degrees F

1. Remove intake air duct from throttle body

2. Start engine

3. Place finger over the lower port in the throttle body, make sure that there is air flow with the engine cold. It will be the only hole infront of the throttle plate If their is no air flow being sucked through this hole replace the fast idle thermo valve and retest.

4. Start the engine and hold at 3,000 rpm with no load untile the radiator fan comes on. Then let the car idle.

Check that the valve is completely closed. If the valve is leadking the idle speed will drop when you cover the lower port. Check engine coolant level for air in the cooling system. If their is non replace the fast idle thermo valve and recheck.
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Old 05-17-2008, 09:07 PM
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...........or.......... turn on the AC and just keep the air on low or something, that worked for me.
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