Posted by Bob
on 9/19/2009, 12:11 pm
69.204.217.140
Guys,
I've got a 1962 Falcon with the 170 motor. The carburetor is a Holley with the tag number C2DE. The carburetor had a lot of miles on it and was running rough. In order to get any kind of decent idle, the idle needle had to be open over three turns, which seemed like a lot.
I bought a rebuilt version of this carburetor from eBay. It arrived in good condition and looked really nice. I installed it on the car this morning. I checked the idle needle and found that it was open about 1 1/2 turns...just what the rebuilding specs call out. I started the car, let it warm up, and found that the idle was very rough. I put a screwdriver in the slot and started to adjust the idle mixture. I had to back it out another 1 3/4 turns to get it to idle reasonably well. This was just like the old carburetor, although in all other respects it seemed to run better.
I could only think that the problem might be a vacuum leak of some kind. I disconnected and plugged vacuum line to the automatic transmission...no effect. I disconnected and plugged the line to the vacuum wipers...no effect. I disconnected and plugged the line to the PCV valve (which I had installed myself, some time ago)...no effect.
Does anyone have any suggestions on what might be causing this problem?
Thanks in advance.
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