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Discussion Starter · #1 ·
'81 ZXT idles slow when cold, about 550 rpm. I have to keep my foot on the gas to keep the darn thing at 1,000 so it won't load up and die. when hot it idles better but fluctuates by 100 rpm +-. In checking, I found that I can get a good solid 650 rpm idle if I pull and vacuum line to the top of the pressure regulator and plug the end that fits to the fuel regulator. Still no cold fast idle but at least a good idle when warm.

What gives, is the regulator bad? Will replacing it solve the cold idle issue or is there another place to look?

Help!!!
 

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> '81 ZXT idles slow when cold, about 550 rpm.
> I have to keep my foot on the gas to keep
> the darn thing at 1,000 so it won't load up
> and die. when hot it idles better but
> fluctuates by 100 rpm +-. In checking, I
> found that I can get a good solid 650 rpm
> idle if I pull and vacuum line to the top of
> the pressure regulator and plug the end that
> fits to the fuel regulator. Still no cold
> fast idle but at least a good idle when
> warm.

> What gives, is the regulator bad? Will
> replacing it solve the cold idle issue or is
> there another place to look?

> Help!!!
Check your air regulator. Ive got a friend with a zx that had that problem, but just when the engine was cold, so im not sure. Sounds like the air regulator though.

Mike B.
 

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Discussion Starter · #3 ·
> Check your air regulator. Ive got a friend
> with a zx that had that problem, but just
> when the engine was cold, so im not sure.
> Sounds like the air regulator though.

> Mike B.

When you are checking the air regulator, take a good look at the condition of the rubber boot after the air flow meter. These have been known to develop small cracks and when the engine temp changes, the rubber swells or contracts and allows un metered air to go in. Just a thought.
JN
 
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