Re: rpm behavior

["David Teitelbaum" <jtrealty@xxxx>]

The decleration valves you are referring to are to prevent backfiring
when you quickly remove your foot from the gas pedal and coast. If you
do not get any backfiring then they are probably OK. You could inspect
them to make sure they move freely and are held closed by the springs.
When you go in there make sure you have all the gaskets, "O" rings and
spacers properly sealing. The throttle shaft shouldn't be too loose
either or you will have an air leak. Only 1 bolt holds the throttle
body so if it won't hold tight then you have to replace it and or use
a thread insert. Make sure the bolt also has a washer so it can't leak
under the head.
David Teitelbaum
vin 10757


--- In dmcnews@xxxxxxxxxxxxxxx, "dmcmike2002" <billsfanmd@xxxx> wrote:
> I may have a difficult time explaining this but i'll try. I have 
> solved 95 percent of my idle issues but this one last little thing 
> bugs me. I am reluctant to do anything drastic cause my car starts 
> fine, has pep and idles pretty smooth. My question is when I take it 
> out of gear (5 speed). On most makes of cars the RPM drops to the 
> correct idle and settles where it should. On my car the idle drops 
> below the correct idle (about 600rpm) and then "catches itself and 
> goes up to about 7500 and idles pretty smooth. Before I solved my 
> idle problem it would stall alot doing this. After correcting some 
> improper hoses it runs much better.
> 
> I was wondering about the throttle valves and the little deceleration 
> valve that is supposed to relieve vacuum pressure for the few seconds 
> when you take car out of gear and the idle motor kicks in. There is 
> one full page in the DMC manual on this function. I had suspected 
> this as a possible cause and a fellow owner mentioned it too. Hope 
> this makes sense. I dont hear any mention of this as ever causing any 
> problems so this may be off base. 
> 
> Just wanted to see if I could solve my last little idle glitch.
> 
> Mike C
> 2109