1994 Isuzu Trooper Irattic idling
120

Asked by oldtechnology123 Oct 23, 2014 at 04:06 AM about the 1994 Isuzu Trooper 4 Dr SE 4WD SUV

Question type: Maintenance & Repair

I have a 1994 Isuzu Trooper 3.2 V6 SOHC.
Since replacing the Battery, the vehicle idles at 2000 rpm on start up, then very slowly
drops to 900 rpm.
As soon as I touch the accelerator the revs jump back to 2000.
The vehicle drives normally, but when I stop, the engine "hunts" between 1250 and
1750 rpm, then goes up to 2000 rpm, then drops to 900 very slowly.
I was advised on internet to check the Idle Air Control valve, which I found gummed up
and replaced with a new one.
This does not seem to have solved the problem. Very occasionally the engine runs
normally, then the next start up reverts to the problem

2 Answers
144,895

T_S_T answered 10 years ago

Check the throttlle position sensor,if bad it will cause this.

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120

oldtechnology123 answered 10 years ago

Many thanks for your prompt replies, it's been over a month and I was getting desperate. Before I received your replies, I queried adjusting the "Idle Control Valve" on another site, and the reply was: After fitting the IACV, turn the ignition on, pause, turn ignition off pause. Do this at least four times, and the IACV will adjust itself. I did this, and for the last 2 days the Isuzu has been running like a bird, no problems whatsoever. FYI The Trooper has done 300,000 Km, and to date I have replaced: 1 Clutch, 1 Timing chain Tensioner, 1 HT lead, repaired starter motor and fitted new timing chain every 100,000 Km (Plus 1 IACV) I am an avid camper, so the Trooper has pulled a 2000 kg off road caravan in Mountainous areas. Best vehicle I have ever had.

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