Ok so i can't figure out why my Q-Jet is Idling to high. It runs around 2500 rpms. A lot of people say that it is a vaccum leak but im not sure. The other day I was checking it out. Fumes are coming out the exhaust, like excess gas. Is it possible that it is just running too rich, so it is idling fast?

 

vac leak or the choke could be stuck partially on causing the high idle cam to engage.

 

Is your choke opening?

 

fumes ? too much fuel ? do you have the E4ME or a non ECM carb or ?

is the choke fast idle screw turned clockwise too much ? is the choke cam weight down all the way ?

make sure the chok is open yes

 

Check your springs and levers for grime and dirt

 

What should the timing be on an 86 Iroc 305 4bbl?

 

Factory spec is 0 degrees (TDC) at idle with the flat 4-wire connector from the distributor base to the firewall harness disconnected.

 

but i thought that there is usually an offset on most cars. Not TDC. maybe a little more or a little less. U know?

 

We have a very unusual car.

If you like I can go out and take a picture of the emissions decal under the hood. Yours probably has it unless it has suffered a catastrophic event.

If your EGR valve is operating properly, you can probably give it as much as 6 degrees BTDC base with no ill effects.

 

thanks