[TmfZ]

My mechanic told me, yesterday, that I needed an "auxiliary air valve" for my 1978 280Z. I can find no reference in the service manual or part by this name in any catalog. Does anyone know what he is referring to? I don't think he's blowing smoke since he has been my mechanic for years, I trust him and he has kept my Z running great. I'm just a little confused here.

 

[yo2001]

air regulator is what he is talking about

 

[z_man300]

Yup. It's just behind the cold start injector; you'll see vacuum hoses going into and out of it.

 

[winoman]

Me too...

My mechanic just told me to replace my air regulator too. Said it would fix the cold-slow/rough idle thing. Kinda pricey little buggers. Someone just posted the other day about taking it off and flushing it out or soaking it with B-12 or carb cleaner. Have not had a chance to do it yet. Will it work?

steve 77

 

[z_man300]

Re: Me too...

Cleaning is worth a try, especially on the 75/76. The way the vacuum hoses were set up on these allowed oily junk from the valve cover to coat them and foul them up.
The hoses and actual electrical "guts" on these things are what usually go bad though.

 

[TmfZ]

Re: Me too...

Thanks guys....but I specificially asked about the air regulator and I actually replaced that part with a new one less than six months ago.

 

[Jeremy260Z]

Re: Me too...

AAC valve maybe?
auxiliary air control valve. There have been a few posts about this in the last week or so

 

[TurboSi]

If this guy is such a reputable mechanic then he should be able to either point to or explain exactly what it is that he is talking about, and what he thinks is wrong with the part. There are very few trustworthy mechanics available nowadays for these cars. I personally think that you will find better answers here than from your neighborhood mechanic when dealing with a 20 to 30 year old Datsun Z problem.

 

[Jay Z]

Actually auxillary air valve is correct. Its the round shaped metal device that sits on top of the intake mainfold. It has two large hoses attatched to it and an electrical connector on it. Inside is an electrical motor that opens and closes an gate valve that supplies additional air while the cold start injector is running. If it is not working properly, the engine will run way to rich while the cold start injector is operating, resulting in a no fast idle when the car is started. Also the engine seems to run at a higher idle when it warms up. I have recently replace mine due the problems stated above with a junkyard variety that cost me 16 bucks. A great bargain considering the over 60 dollar price for a new one. I'd suggest going that route, its very easy to replace, 2 bolts, two hoses and an electrical connector.

Good luck

Jay Zyo2001 wrote:
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