Hi again gents, wasn't sure if I should start a new thread or stay on my older one "carburetor question" from 11-4-12. BTW, happy new year!
I took your advice and rebuilt the 4100 I bought used. A note that was with it said it was from a 67 T-bird 390. Other than a bent secondary vacuum pickup tube it seems perfect. The rebuild went very smoothly and I feel good knowing that all the little passage ways are clean and flowing great. I put it on yesterday (in the snow) and it fired right up. I could instantly feel a better throttle response, and I hadn't even adjusted it.
Here's my problem though. I can't get it to idle lower than about 8000 rpm. I drove it around and it got good and hot, and the choke was fully opened. I can back off the throttle screw until it isn't seated anymore, then back off the secondary throttle screw too, but unless I push on the secondary throttle screw head it stays idling at about 8000. This carb is a little different from the original in that it has a hex head screw that screws into a plastic piece that seems to tie in with the fast idle cam and bellcrank lever. Here's a few pictures of my setup, and my throttle linkage.
At any rate, can anyone point me at what to look for first when the idle is so high?
Oh wait, I just re-read page 2-30 and noticed that I never set the secondary throttle plate per instructions - that sure looks like it could be my problem. Yes? no?
I'll post this anyways, and go check it now.
thx, Dave J
I took your advice and rebuilt the 4100 I bought used. A note that was with it said it was from a 67 T-bird 390. Other than a bent secondary vacuum pickup tube it seems perfect. The rebuild went very smoothly and I feel good knowing that all the little passage ways are clean and flowing great. I put it on yesterday (in the snow) and it fired right up. I could instantly feel a better throttle response, and I hadn't even adjusted it.
Here's my problem though. I can't get it to idle lower than about 8000 rpm. I drove it around and it got good and hot, and the choke was fully opened. I can back off the throttle screw until it isn't seated anymore, then back off the secondary throttle screw too, but unless I push on the secondary throttle screw head it stays idling at about 8000. This carb is a little different from the original in that it has a hex head screw that screws into a plastic piece that seems to tie in with the fast idle cam and bellcrank lever. Here's a few pictures of my setup, and my throttle linkage.
At any rate, can anyone point me at what to look for first when the idle is so high?
Oh wait, I just re-read page 2-30 and noticed that I never set the secondary throttle plate per instructions - that sure looks like it could be my problem. Yes? no?
I'll post this anyways, and go check it now.
thx, Dave J
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