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Ask Chris (aka-Moose) Your Own Question
Chris (aka-Moose)
Chris (aka-Moose), Technician
Category: Car
Satisfied Customers: 1176
Experience:  16 years of experience
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I 't see any Isuzu techs listed 91 Isuzu 2.3 liter

Customer Question

I don't see any Isuzu techs listed 91 Isuzu 2.3 liter pickup engine running at 2to 3 thousand rpms sitting still linkage is fine unplugged all electronics no help
Submitted: 1 year ago.
Category: Car
Expert:  Gary replied 1 year ago.

Hi there,

Is your engine a 4ZD1 carburettor engine?

Or are you sure it is a 2.3 litre?


Customer: replied 1 year ago.
it is a 2.3 sticker under hood says engine is a LW3
Customer: replied 1 year ago.
carb yes
Expert:  Gary replied 1 year ago.

Ok, so there is a problem with the carburetor.

Can you remove the air cleaner lid and verify the choke blade is fully open when the engine is warmed up?

Is the primary throttle linkage away from the fast idle cam at hot idle position?

Have you checked for any other vacuum leaks?


Customer: replied 1 year ago.
to all the above that's why I am puzzled this engine has allways idled a little high and I have talked to other owners who say they have had same issue but nothing like this I know it is a carb issue or intake gasket maybe hopeing u may of known of an electronic issue there are three sencors of some type on the carb unplugging thelm didnt help
Expert:  Gary replied 1 year ago.

How long has it been doing this?

Gradual or sudden change in idle speed?

Customer: replied 1 year ago.
suddenly turned it off went 5m later started went nuts wont stop
Expert:  Gary replied 1 year ago.

Unusual for a carburetor to do that in any other way except if the fast idle cam has stuck up in the fast idle position.

It could be binding on it's pivot post.

Can you check to see if the throttle lever is resting on the idle speed screw or is there a gap?