View Full Version : propane idle adjustment/timing.

01-28-2007, 08:42 PM
Got the new engine up and running today. The thing only runs at around 2300RPM anything below 1800RPM and it will die. It wont even come close to idling. Ive got a impco 425 mixer on a 350 with high compression and an RV cam. Should i use the throttle control and adjust the idle that way or use the litte screw on the front bottom loft of the mixer?

Secondly, how do i adjust the timing if to my base timing of 12* BTDC if i cant get it to idle right?


01-28-2007, 09:51 PM
You can get the timing close while at 1800RPM.

Sounds like you have a vacum leak.

01-28-2007, 10:25 PM
yup i think u have vacuum leak.....and did u set up ur dist for propane with the proper lockout plate.........u nedd somebody with the 3 stage timing light so they can set the timing at about 27-29 degrees at full advance at around 2000prm.....good luck..[36]

01-29-2007, 10:05 PM
come to think of it, i forgot to plug one of my vaccum lines with a bolt. Secondly, i was told to set the base timing @ 12* BTDC and then i'd drive it over to my engine builder ( Scott @ Dun-Rite performance) and he'd set it all up for me. Thanks for the tip.[cheers]

01-29-2007, 10:52 PM
....yup thats what u need too do and ur builder can set it up all good...[36]

Ginger Snaps
01-30-2007, 03:26 PM
get it done yo so you can help me with my axel swap hehee

01-30-2007, 06:39 PM
ok. I'm working on it tonight. We can pickup the axles in my pickup.

I found not one but two vaccum leaks( i think they got disconnected fiddling with the disty) so i hope that helps a lot more.

I'm tinkering with it tonight.

01-31-2007, 02:39 PM
how new is your mixer? sometimes those develop internal leaks after a while

02-02-2007, 07:00 PM
couldnt tell ya. My guess is at least 3-4 years.