Fast Idle

[terry mckeown]

Thanks Jerry for the info. I will probably pull the plenum again next week and check to fit of the new injectors, I did oil the O rings in the primarys and put oil on all the O rings on the injectors, however inserting them in the holes in the injector housing was tight and maybe I was too rough. Is it possible that one of the O rings moved or came out of the groove?
I have sniffed all the vacuum lines and connections and around the joint where the plenum meets the injector housing with propane twice and still no luck. I do know that the 2 lines under the plenum are connected could see them with a flashlite. Another question I have if if the PCV is faulty how would that effect the idle.
Thanks again to all for the help.

[scottfab]

uh, before you yank out the plenum or engine make two quick checks.
Does the idle come down if you punch the throttle hard a few times?
If so..

1. take off the bellows and then get the high idle condition to happen. Next reach in with you fingers and push on the throttle plates to see if they'll close more. If they do the idle may come down. I use a small amount of axle greese on the edges of the plates.

2. check the IAC (mounted on the RF of plenum) for contamination (carbon).
Do NOT clean it completely as it has a special grease on it.

[terry mckeown]

Well I finally found my vacuum leak. I used a smoke machine connected to the plenum and found the vacuum line that connects to the plenum left front on the underside. I was able to reach it by removing the throttle cables and the throttle mechanism. Took me about an 11/2 hrs. but I was able to get the hose on about 1/2 inch. Started the car and bingo, she idles at 650-700 rpm. Thanks again to all who helped me, you guys are great.

[gbmidyear66]

Hmmm - I have the same sympton as you Terry, but I don't believe mine is a vac leak - my vac pump does not cycle - and I had same symptom before replacing my injectors.

I am going to start with the IAC, then the throttle plates.