Isuzu Trooper Owners Club UK™

Icelander · Newbie Joined: 05 Dec 2005 Posts: 5 Location: Iceland

My '99 Trooper engine 4JX1, has done this for a long time now. Becomes normal when warmed up. Idling speed is always between 750 to 850 but as soon as I've mooved the accelerator down a few millimeters it revs up to approx. 1200 rpm. From there it steps up pretty normal.

The local service station has not been able to solve this problem.

I would appreciate any suggestions.

It does not matter if the quick warm up button is in or out.
Mileage is 145.000 km.

Ice

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frank sucevic · Posted: Fri Dec 09, 2005 19:30 Post subject:

yes this is a common quirk with the 3.0ltr dont worry bout it mate best to let it warm to the stage where the temp gauge starts to move in cold weather mate frank

Icelander · Newbie Joined: 05 Dec 2005 Posts: 5 Location: Iceland

Thanks for the reply Frank. The local service station gave some hints on that this might be normal which I found hard to believe. It is rather anoyng to corner out of my neighborhood on a cold winter morning not being able to control the rpm better that this.

Dafydd Wynn Williams · Posted: Sat Dec 10, 2005 17:58 Post subject: As posted

Is this the ceramic heater load cutting in???? Once the engine is warm it has no effect, but if cold, as soon as you turn the heater on the revs go up a couple of hundred to balance the electrical load.

Just a thought.

Dafydd W.W.

jon willy · Posted: Sat Dec 10, 2005 18:37 Post subject:

Does the same when the air con clicks in and out......

Sometimes a bit of a *beep* when your in traffic and idling along.

Jon.
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Icelander · Newbie Joined: 05 Dec 2005 Posts: 5 Location: Iceland

Dafydd, this makes me wonder if something could be wrong with the system that helps quick warming up of the engine. I never notice any change of the engine heartbeat when pressing the quick warming up button. The indicator light in the button comes on when pressing the button on a cold day and when the engine temp reaches a certain level the light goes off.
Ice.

frank sucevic · Posted: Sat Dec 10, 2005 18:58 Post subject:

sorry icelander we have not given you the warning DONT use the warm up button i am sure you could give us tips on how not to let your engine get too cold living where you do frank

frank sucevic · Posted: Sat Dec 10, 2005 19:06 Post subject: Re: As posted

Grandad · ******* Joined: 22 Sep 2005 Posts: 1902 Location: NORFOLK

all isuzu diesels have a facility for advancing the injection in cold weather on the 2.8 & 3.1 its done by thermostat and a solenoid in the pump on the 3.0 its done by thermostat and ecu so in cold conditions it is normal for the engine to run faster till it reachs a certain temperature 2.8`s tend to run with a harsher note for a short while because they are direct injection

frank sucevic · Posted: Wed Dec 14, 2005 19:24 Post subject:

grandad do they have a enrichment devise like a choke or something that makes em pump extra diesel in or just the advance feature Question

frank

Grandad · ******* Joined: 22 Sep 2005 Posts: 1902 Location: NORFOLK

i dont think there is an over fuel device on the 2.8 or3.1 that system for cold starting was only used on inline fuel pumps with rotary pumps it is easier to advance the pump internally by raising the pressure. this could give rise to an increase in fuel injected, possibly ???

frank sucevic · Posted: Thu Dec 15, 2005 18:28 Post subject:

cheers grandad advanced hydrolics was never easy to understand for me frank

NickP · **** Joined: 07 Jan 2005 Posts: 281 Location: South East

This is common on the 3.0,it's something to do with the oil pressure when cold and the fly by wire system and is nothing to worry about ! You just have to live with it! There were other threads about this on the old forum
layout.

Icelander · Newbie Joined: 05 Dec 2005 Posts: 5 Location: Iceland

Tanks for all the input mates. An electric-engine-block-heater will most likely minimize this problem and speed up the heating of the engine on a cold morning. Icelander.

frank sucevic · Posted: Thu Dec 22, 2005 18:10 Post subject:

good to here from you icelander i was getting worried you were frozen in mate lol is it true a lot of the motors up there run on some form of gas mate frankie