Real time help! Vacuum leaks fixed idling too high

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jclark

jclark

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Ok,

So I've re-hosed the emissions system and taken care of several vacuum leaks. My big problem now is the engine idles WAY too high at 2000 RPM's. I've tried following the directions in the 2F Manual and Haynes manual but I've only been able to get it down to 1500RPM when I turn the fast idle screw to both extremes. The idle mixture screw is all the way in (attempting LEAN method from the 2F manual) and I don't want to go too far and completely unscrew the fast idle screw. Also, there seem to be two screws back there over springs, are they BOTH fast idle screws?

Can anyone please advise with some suggestions on what else to try?
 
It sounds like you may not be adjusting your idle adjusting screw. Your idle adjustment screw is at the base of the carb, on the firewall side of the carb, with it's head pointing at the driver-side fender.
 
Idling issues

Just double checked, I think I've got the correct screw. The manual says to adjust fully choked then push the choke in and it should drop to normal RPM's. I can't get it to start with the choke out, she doesn't turn over. No choke and I'm already at 1500RPMs.
 
LowcountryTLC said:
Just double checked, I think I've got the correct screw. The manual says to adjust fully choked then push the choke in and it should drop to normal RPM's. I can't get it to start with the choke out, she doesn't turn over. No choke and I'm already at 1500RPMs.
Click to expand...
Sorry I couldn't help. By the way, it's s'posta idle fast when choked. Regular idle is a different adjustment than the choke adjustment.
 
Lean Drop

Hi-

-Your truck should be warmed up to normal operating temperature.
-Your choke should be fully OPEN.
-Your mixture screw, (the one on the passenger side of the carb,) should be 2 turns out.
-All accessories switched off
-Timing set to 7 deg.
-Tranny in neutral.

then follow fsm for lean drop.

good luck!
 
Ok, so me and buddy got it sorted out. There's a screw on the opposite side of the carby from the idle screw. It had been turned all the way in by the PO. When we figured out it was the reason we could not back off the idle screw, it took 3 rotations and the idle dropped to 700rpm's and purred w/ np.

Thanks for the feedback everyone.
 
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