Question about 1989 Pontiac LeMans

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1989 Pontiac Lemans idles at 2500-3000 RPM even when hot

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Turn the idle screw down lol

Posted on Jan 19, 2010


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Idles@2500 rpm until engine warms up

old post
all do, everyone. but. the devil really is in the details with EFI.
this IAC valve does that,
to speed it up warm up , put in a 195F thermostat.
this assumes 800 RPM is hot.
most of these engines, do this. new. bewlow.

1: cold start, for 3 to 15sec, 2500 rpm , worse in alaska.
2: then the above DASH pot closes and IAC takes over, at ~1200
3: then as engine heats the IAC closed inch by micro inch a
its now 100% closed and the ECU not controls idle hot.
using the modulated ISC,
there is a fast idle feature on this year, 950 to1000 rpm hot
with these turned on.
1. headlights hot.
2: defrost glass, rear.
3: heater fan on.
4: a/c on if opted.
other wise 800 is normal hot.

Jan 13, 2014 | 1989 Geo Tracker

1 Answer

Where is the cooling fan relay located on a 1989 Pontiac Lemans?

fan relay is mounted on the fuse box under the dash on the drivers side

Jul 08, 2010 | 1989 Pontiac LeMans

1 Answer

Cylinder 3 and 6 not firing

If you had a shorted ignition coil, it may have damaged the ignition module.Take a coil pack from another spot,plug it in just be sure your new one is good.if it still won't spark replace the module.I've seen these that won't spark cold but run ok hot.You can try to heat the module with a hair drier to see if you get it to work,but even if it does you still need a module...good luck

Apr 09, 2010 | 1989 Pontiac Bonneville

1 Answer

1989 pontiac lemans will not start after shutting off when warm

aside from checking for a vapour lock,I'd invest in a newer car.

Mar 23, 2010 | 1989 Pontiac LeMans

1 Answer

My 92 Pontiac Lemans runs but idles too low and dies. What could be causing this?

turn the idle screw on the carburettor up till it idles correctly or try clean the idle jet

Jan 19, 2010 | 1992 Pontiac LeMans

1 Answer

My 89 honda accord lxi with the 2.0 won't idle correctly, it idles up and down and when you first start it up in the morning it idles about 2500 rpm or higher.

air in the IACV (idle air control valve) coolant line - air bubbles in the coolant will confuse the iacv into incorrect idle settings.....even when hot, and a fault in this unit will do the same thing, very very common fault in a honda.

Jan 13, 2010 | 1989 Honda Accord 4 Door

1 Answer

1989 pontiac tempest: Im having trouble finding the turnsignal relay or whaatever its called. i have the new part, but no owners manual/service manual.

the signal flasher should be under the dash on the RIGHT SIDE OF THE STEERING COLUMN clipped to the dash carrier
it has been awhile so i'm not a 100% sure i know a 1990 sunbird is there
hope this helps

Dec 04, 2009 | 1989 Pontiac LeMans

1 Answer

Where is the fuel filter on a pontiac lemans 1989

the fuel filter is on the pasenger side of the car underneath on the body about 2 ft in front of the rear right tire youll see a clamp around it and two lines coming out.

May 02, 2009 | Pontiac LeMans Cars & Trucks

1 Answer

My 1991 pontiac lemans wont ideal

check your fuel filter is clean, and may need to clean idle jet on carburettor

Feb 17, 2009 | 1991 Pontiac LeMans

1 Answer

Idle RPM

the idle on most firebirds are set from the factory and are not adjustable but you could look on the sticker on the bottom side of the hood or above the radiator. the emission control or the drive belt routing sticker should have it on there. hope this helps you... god bless

Jan 27, 2009 | 1989 Pontiac Firebird

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