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post #1 of 4 (permalink) Old 10-02-04, 10:35 PM Thread Starter
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Erratic idle - EA MPFI

Hello all.
I have a rather annoying problem. My base idle is fine, if I'm in gear or the isc is disconnected, the car idles perfectly at around 650-700 rpm.
When I am in park, however, it's a different story. I started the car earlier, got it warmed up, and when I pulled over and put it in park I noticed the idle seemed to be hunting.
It'll sit at 800 rpm, then go up to 1000, then back down, then up, and so on and so for at around 5 second intervals. This only happened *after* I turned my headlights on.
Is this likely to be a dodgy alternator, low battery voltage, or is my isc stuffed?
Any help would be appreciated, it's driving me nuts.


EA GL-Ghia pseudo operator
3.9 MPFI converted 4 speed
2.5 inch exhaust
NC Ghia interior (except rear trims)
Fairmont audio (with 4 speakers)
Cruise control
S-pac cluster with white dials
Trip computer and Fairmont interior lighting.
Half wired Ghia BCM.
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post #2 of 4 (permalink) Old 10-03-04, 03:24 AM
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Re: Erratic idle - EA MPFI

Disconect your battery and leave it for about 5 min reconect and start engine. If your base idle is OK, Pull park brake on and lights on (high) put it in drive and let it idle for 8-10 min then drive it at 60km/h for 10min then 100km/h. Allthogh this sounds like a lota crap it will "teach" your computer to except whats expected of it, if you know what i mean, give it a try OK
Baz
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post #3 of 4 (permalink) Old 10-03-04, 04:55 AM
'90 EA-II Fairmont
 
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Re: Erratic idle - EA MPFI

check the battery terminals... a bit of corosion on mine put the car into limp home and ****ed with my temp guages, even tho everything seemed ok (parkers, temp went up, lows temps even higher (by guage), highs, temps read into the red)

Rosewood EAII Fairmont 02/90. MPFI 3.9L (formerly CFI), 4spd BTR Auto. Skyline geared 3.45g open center 28 spline 4 pinion differential & axles. 2 1/2" Cat Back Exhaust. King Super Low Springs. Sound: Equalization and amplification by Clarion; Head unit by Sony, Front, Rears and Sub by Pioneer. Planned mods - t5, Extractors, Painting Grey Strips and new front and rear bar.
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post #4 of 4 (permalink) Old 10-03-04, 04:40 PM
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Re: Erratic idle - EA MPFI

Quote:
Originally Posted by barman5
Disconect your battery and leave it for about 5 min reconect and start engine. If your base idle is OK, Pull park brake on and lights on (high) put it in drive and let it idle for 8-10 min then drive it at 60km/h for 10min then 100km/h. Allthogh this sounds like a lota crap it will "teach" your computer to except whats expected of it, if you know what i mean, give it a try OK
Baz
What do you do if the base idle isn't okay?
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