New VX Owner and Rough Idle

[Andrey]

Welcome to the club ! I myself have '99 with rough idle. I've heard the intake gasket needs replacement. Depening on the weather/humidity conditions it will act on you. I've heard it is $200 repair. Good luck !

[AlaskaVX]

I would definately look into the intake gasket as others have mentioned. Other little things to do may be change the fuel filter, spark plugs, clean/wipe down MAF sensor in intake. But if you can get the code read we can probobly help more.

BTW... Which Island in Alaska?

[Dare2Dream]

I'd look at two things: The intake gasket as everyone else mentioned and also around the EGR for any leaks. When one of my EGR bolt was loose, i had a dancing idle.

So in other words, some sort of an air leak would cause that. If that is the case for you, then you'd also probably feel some power loss. In my case, I had this sound whenever I accelerated, it was like someone holding a card in the spikes of a bike.

[etlsport]

was looking for a dome light through google and somehow ended up at a general maintence site?? anyway found this little tidbit and figured it might be helpful

Eratic Idle Speed:

Isuzu engines commonly exhibit eratic idle problems, the engine revving and dropping in rpms, sometimes dropping almost to the point of dying. There are several things that can cause this problem:
Leaks in the vacume hoses or aged, cracked hoses can let in air that is not being metered by the ECU's sensors.
Leaking or sticking EGR Bypass valve may be allowing exhaust gasses into the intake when the engine is not under load (idling).
Loose electrical connections in the engine sensors can cause problems.

doesnt specifically talk about VXs or even the 6VE1... but it does give good random isuzu advice

http://www.isuzuperformance.com/isupage/tech/tips.html

[Beavertractors]

When my intake gasket went, the engine started to run rough and you could hear the air hissing.The gasket gets brittle with age and heat.Call merlin for the new and improved gasket..good luck Tony B

[TEN36VX]

Mine had the exact same idle problem you describe, especially in warmer weather. All problems solved with the Intake Manifold Gasket replacement. As others suggested, I'd start there.

[newthings]

I would suspect a vacuum leak. Bolts holding brackets to the intake maniford go clear through into the intake passages. The bolts get loose and you have a leak. Check the EGR to intake maniford bracket ( At firewall on the pass side). A long bolt goes straight down and can fall up and out producing a monster leak.
Welcome, Roy