Isuzu Trooper Owners Club UK™

bighorn_92 · * Joined: 28 Feb 2007 Posts: 18 Location: cork irelans

hello all excellent site. I have a 1992 trooper 3.1td bighorn auto. I browsed through the site and found loads of info on my problem which is the shifting down while crusing along and also my speedo is stuck. will the shifting down do more damage i should be concerend with or can i live with it? I do a lot of towing mainly.Also im in 'Cork ireland and was wondering if ye lads knew where i could get a cheap replacement speed sensor? as my speedo is stuck at 70mph and is would the speed densor replacement definatly fix this? i know sweet *beeb* all about the trooper so nows a good a time as any. also could i give the speed sensor replacement a go myself?

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Hard1 · Posted: Wed Feb 28, 2007 16:21 Post subject:

Hi welcome to the forum. It is most likely that changing the speed sensor will cure the speedo. There is a lot of info on the forum but basically there seem to be 2 different types, 2 wire and 3 wire and you should replace like with like. From a UK breaker (they are quite a rare animal) they are £50 ish and from Isuzu/Vauxhall probably £250 or thereabouts.

The manic shifting thing is well documented also. You can drive around it like many have but it seems to be caused by a worn Throttle Position Sensor, again, there's plenty of info on the Gearbox and transmission forum on how to adjust it. It's not possible at the moment to buy just the sensor as Isuzu want you to buy the throttle body too @ £300 ish. Shocked

I've adjusted mine successfully and I'm really happy that I've cured the manic shifting problem for now anyway.

We are trying to see if we can get them from Oz or NZ where they sell them separately, or source a regular non Isuzu sensor from a UK source that will work OK.

In the meantime, in answer to your question re: will it damage my box, of course as a mechanical item, you are wearing it out quicker with more shifting!

Two things to remember about this (or any) auto box. Whilst it's fine for regular use, Isuzu themselves recommend changing ATF every 20,000 miles for heavy duty work and towing - plus it's VERY advisable to fit an additional transmission cooler in series with the standard one for HD and towing work. Excess heat is the enemy of auto boxes...

Hope this helps... Smile

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1999 Cougar with a NICE motor..

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bighorn_92 · * Joined: 28 Feb 2007 Posts: 18 Location: cork irelans

thats great thanks very much for the info I will try to get a speed sensor somewhere definatly wont get new at that price tho! unless i realy have to like when its time for my doe test in september!. I have a mate in brisbane who i could ask about the parts and ill pass on the info if hes able to get some on their own as you say.
thanks again

Hard1 · Posted: Fri Mar 02, 2007 2:19 Post subject:

Apparently, new they are $A80 in Oz....
Please keep us in the loop if he can get them and how much the postage would be. I should think they probably weigh less than a gnats pube. tongue8

_________________
1999 Cougar with a NICE motor..

Click HERE to see under my bonnet!

MartQ · Posted: Sat Mar 03, 2007 11:51 Post subject:

Is the speedo stuck at 70 even when switched off? If so would suspect needle is touching fascia, in which case changing the sensor won't fix it. If the dial has been swapped for a mph front, this may have happened at the time it was swapped as they are quite fragile. Easy way to tell if the face plate has been swapped is if the speedo reads mph but the odometer is in km.
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94 Big Horn 3.1 Lotus Auto
Torque Flung Dirt Technique!

bighorn_92 · * Joined: 28 Feb 2007 Posts: 18 Location: cork irelans

hi marty no the speedo goes back to 0 when shes turned off.

MartQ · Posted: Sat Mar 03, 2007 23:40 Post subject:

Not that then Shocked

_________________
94 Big Horn 3.1 Lotus Auto
Torque Flung Dirt Technique!