Question about 1999 Isuzu Trooper

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My 1999 isuzu trooper is continually having egr problems... why? is there something that can be fixed that is causing this to happen?

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Just because the dtc thats in memory says an egr fault doesnt mean that the egr is the problem.... there could be a vacuum leak, excess carbon bulild up in egr passages, another emission sensor, or the wiring or harness connector could be the problem

Posted on Jul 15, 2009

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What are codes p0401 and p0300 mean on a 2000 isuzu trooper


P0401 is EGR problem
P0300 is a cylinder 3 misfire.
Replace EGR valve and do a full tune-up.

Mar 19, 2014 | 2000 Isuzu Trooper

1 Answer

Egr valve was removed and cleaned mechanic said it was good check engine light is on code called for bad egr.while driving it your pressing on the gas but spedomiter drops revs like you put it in...


sounds like vacumm problem,could be bad modulator valve for ******,have control sylinoid for egr checked,is it still showing egr problem?

Aug 26, 2011 | 1999 Isuzu Trooper

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1998 isuzu trooper egr.valve how do i fix insufficient flow


The passages in the manifold are stopped up. You will need something like an old speedo cable and a drill to fix.

May 10, 2011 | Isuzu Trooper Cars & Trucks

1 Answer

Where is the egr valve for a 1999 isuzu trooper?


The EGR valve is a cylindrical unit above the engine. It would be behind the throttle body.
It will have a cable connected to it. Unplug the cable.
There two bolts. Simply remove.
An that is all there is to it.
Simply put the new EGR valve in its place, screw in the bolts and reconnect the cable.
Make sure to see a gasket. The gasket can stick to either the EGR valve or the throttle body. It does come off easily but since it is metallic, it looks like it part of the throttle/egr valve.

74cc5a2.jpgThanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

Jul 03, 2009 | 1999 Isuzu Trooper

1 Answer

Oxygen Sensor on '99 Isuzu Trooper


The O2 sensor is on the engine side (up stream) before the catalytic converter in the exhaust pipe, it is barrel shaped about the size of a jumbo magic marker.

Sep 30, 2008 | 1999 Isuzu Trooper

1 Answer

1991 Trooper


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.

Aug 06, 2008 | 1991 Isuzu Trooper

4 Answers

Blinker problems with my 1999 Isuzu trooper


In the fuse box there will be those black boxes, they are called relays, there will be one of them for the flasher. You could swap this with a known good one (AC or something) and see if that helps your problem

Jun 20, 2008 | 1999 Isuzu Trooper

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