Fast idle issue
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Fast idle issue
I rebuilt my carb (stock Motorcraft 2150) a few months back as my truck (1977 Ford F150 6.6L Auto) sat for a few years without being driven much and was running poorly. The truck now runs great once fully warmed up. However, the cold start process is off. I have a manual choke kit but I'd like to give the assisted choke (I think that's what it's called...it has the heat tube) a chance.
I don't think my fast idle is working. I make sure to pump the pedal once prior to starting. It idles near the same as my idle at startup. it doesn't change regardless if the fast idle screw is in or out.
I set the following items to spec per my rebuild sheet and FMC400's famed post:
I replaced the choke pulloff because the old one wasn't moving when vacuum was applied. Choke cap is pretty new as well. This was prior to all the adjustments being set.
My idle in park is roughly 800 rpm. My curb idle is 650 rpm. My vacuum at idle is between 18 or 19 at 1000 ft. above sea level.
Am I missing something? I appreciate the help.
I don't think my fast idle is working. I make sure to pump the pedal once prior to starting. It idles near the same as my idle at startup. it doesn't change regardless if the fast idle screw is in or out.
I set the following items to spec per my rebuild sheet and FMC400's famed post:
- Dry float level 1/2"
- Pump overtravel level in top hole
- Choke valve pulldown at .160"
- Choke at 3Rich
- Set the screw to V notch
I replaced the choke pulloff because the old one wasn't moving when vacuum was applied. Choke cap is pretty new as well. This was prior to all the adjustments being set.
My idle in park is roughly 800 rpm. My curb idle is 650 rpm. My vacuum at idle is between 18 or 19 at 1000 ft. above sea level.
Am I missing something? I appreciate the help.
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Joined: Nov 2006
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From: Simi Valley, CA
I rebuilt my carb (stock Motorcraft 2150) a few months back as my truck (1977 Ford F150 400 Auto) sat for a few years without being driven much and was running poorly. The truck now runs great once fully warmed up. However, the cold start process is off. I have a manual choke kit but I'd like to give the assisted choke (I think that's what it's called...it has the heat tube) a chance.
I don't think my fast idle is working. I make sure to pump the pedal once prior to starting. It idles near the same as my idle at startup. it doesn't change regardless if the fast idle screw is in or out.
I don't think my fast idle is working. I make sure to pump the pedal once prior to starting. It idles near the same as my idle at startup. it doesn't change regardless if the fast idle screw is in or out.
Yes, I'm aware this isn't the 351M/400 pic, but there isn't one. The cam is the same regardless for all 1975/79 2150 2V's (D5AZ-9597-A / Motorcraft CM-2105).
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It does not appear broken. I'll snap a picture when I get a few to vefify.
Are there any checks I can do to verify the function of the fast idle system? Are there any write ups or videos that explain it's function in detail? It almost seems like the linkage is bound up but it moves freely when I manipulate it by hand.
Are there any checks I can do to verify the function of the fast idle system? Are there any write ups or videos that explain it's function in detail? It almost seems like the linkage is bound up but it moves freely when I manipulate it by hand.
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jameson8808
Ford Inline Six, 200, 250, 4.9L / 300
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Feb 4, 2011 11:50 PM
