Question about 1991 Isuzu Trooper

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1991 Trooper I have a 91 Trooper.. it will start.. but the minute I take my foot off the gas it dies.. any suggestions?? the fuel filter has about 10,000 miles on it.. and I changed out the fuel pump in the gas tank at the same time...

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Mike Deemer-White

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I have a '90 trooper, 2.6L and I had the same problem. Although what fixed mine, may not fix yours, as there are many reasons for this condition. What I did:
Check and ensure all vacuum lines are connected, one broken or loose little bugger will cause it to die.
Clogged EGR is another reason this will happen, I replaced mine and it did not cure the problem.
On the pass. fender, under the hood is an elec. controlled air valve. If this goes bad, the truck will die.
I replaced this and it didn't cure my problem.
I finally swapped outt the air switch, connected to the ITEC and the EGR valve went bad. It's a round thing, looks like a top with 3 vacuum ports on it. it's attached to the Valve cover in the back, next to the coil. Once I swapped the this out, the truck ran like a champ.
I can only suggest that you get a Haynes or something like it and test all the different air valves. The part cost me $70 and is only availble through a dealer, and even then , they may have to order it. (Mine did, took 3 weeks to get from Japan) Hope this at least gives you a few places to start.

Posted on Oct 06, 2008

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