308 high idle problem

Guest · Apr 17, 2004

My 1983 308 qv has just developed a high idle problem. After starting it revs to 2800rpm and stays there, it never goes back to low idle now. Temp gauge stays at 195 even after the car is thoroughly warmed up. Last time I had the car out it was perfect now this has unexpectedly cropped up. Any ideas on what to look for to correct this without going to the dealer ($$$$$!!!! :-< )}

Guest · Apr 18, 2004

Hi Glen,

welcome to Ferrari

Hi Glen,

welcome to Ferrari-Talk....

are you sure the Floor Mat has not begun pushing on the throttle pedal? quite common on 308's

If that's not the issue then I'm sure with some investigation you can find the issue....and we can help.

Regards, JRV

Guest · Apr 18, 2004

Glenn:

Welcome to Ferrari-T

Glenn:

Welcome to Ferrari-Talk. Your Auxiliary Air Valve may be stuck open. It is located under the black coolant tank reservoir at the rear of the engine compartment on the far left side. Search the archives how to test the AAV since there are several recent threads on the topic.

Ken

Guest · Apr 18, 2004

Glenn--based upon what was sai

Glenn--based upon what was said in a previous thread on this issue, you can block off the AAV via pinching or plugging one of the 2 hoses attached to it. In doing so, the revs should drop, if it's this part which is malfunctioning. But, of course, this pronlem could be attributable to other things as well.

Best of luck.

Guest · Apr 18, 2004

I've checked the Ferrai UK website for the location of the AAV and can't find it or reference a part number. DO you have the part number for this and where the part is located? I've checked the expansion tank and found a fitting with 2 hoses at the lower right rear corner of the tank, is this what you are referring to?

Thanks for helping the new guy with this

Glenn}

Guest · Apr 18, 2004

Glenn,

do you have a Owners

Glenn,

do you have a Owners Handbook? There are some nice descripative pictures in there with MUCHO other helpful info that can bring one up to speed on locations and basic design.

Yes the metal thing with 2 hoses should be the AAV.

Regards, JRV

Guest · Apr 18, 2004

I checked the hoses leading from the fitting at the lower right hand corner of the expansion tank, one had slipped roughly 1/4". I pushed it back up into place and finished checking both hoses. I fired the car up and for a moment it idled properly and then went back up to 2500rpm. Pinching the hoses while the car was running did not affect the rpm's.
There is also another fitting roughly 2" forward of the first with 2 electrical leads coming to it, does this work inconjunction with the rear one?
I also checked the owners manual and did not find any reference to these fittings. I checked the pdf version downloaded from the ferrari site and came up blank there as well.

Any further help is appreciated

Glenn}

Guest · Apr 18, 2004

Glenn: Before you had this pr

Glenn: Before you had this problem, did the fast idle go to 2500rpm, and then come down to normal, as the engine warmed up?

Guest · Apr 18, 2004

If you have an 83' QV the

If you have an 83' QV the AAV isn't under the recovery tank. It is up near the plenum on the pass. side of the car. To the left of the compressor (a/c). It is round with 2 short vacuum lines connected to it. The 83' also has a another valve for high idle, cold start air valve or something like that. It is round, dome like structure with a little vacuum line at the top of it. It is right next to the AAV and CSI. Pull the vacuum line and see it the idle drops or stays the same. Pull a vacuum on the device via an external source and see if the idle drops. HTHs.

Guest · Apr 18, 2004

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The last tip was it!! The vacuum hose had come the dome like structure!!! Checked the hose put it back on, fired up to a normal high then back to proper low }idle.

THANK YOU!!!!

Glenn Frenck

308 high idle problem

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