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In this Discussion
- Geoff C., N.Z. July 2010
- Hudson308 July 2010
- Ken U-Tx July 2010
- walts garage-53 July 2010
Idling funny
-
I got my 262 going with carter WGD carb... set the timing and the idle. The car should be idling a bit lower (the book says only like 500-600 rpms) maybe but anyways what it's doing when running is ocillating.... the idle speeds up, slows down, speeds up, slows down. When I play with the idle adjustment a bit lower she dies.
Suggestions ?
Idle screws are backed out 1 and 1/2 turns as per the books' instructions. It does accelerate smoothly now that I set the timing.
More clues: disconnected the vac advance and no change. Metering rods seem to be moving up and down with the occilation so I have to assume it's somewhere in the carb. -
Aaron, the metering rod is pulled down to its leaner (thicker) diameter by a vacuum piston. If there is a vacuum leak, or the vacuum passages in the carb body are blocked by dirt/ carbon, the symptoms you describe will happen. Check the carb base gasket, and that the carb is bolted down firmly on its gasket, as well as check the carb body to throttle body gasket, air horn/ top cover gaskets. If the problem is dirt, the passages need to be cleaned out with carb cleaner with the red spray straw, and compressed air. Has this carb been cleaned and rebuilt? Also check that the vacuum advance diaphragm isn't cracked, as this will also cause vacuum at the carb to drop or fluctuate.
Kenneth -
The 1 to 1-1/2 turns of the idle screws is just a guide to get the starting position. You have to adjust these in or out to get a smoothe idle.If you're stuck in a hole, stop digging.
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Ken U-Tx wrote:Aaron, the metering rod is pulled down to its leaner (thicker) diameter by a vacuum piston. If there is a vacuum leak, or the vacuum passages in the carb body are blocked by dirt/ carbon, the symptoms you describe will happen. Check the carb base gasket, and that the carb is bolted down firmly on its gasket, as well as check the carb body to throttle body gasket, air horn/ top cover gaskets. If the problem is dirt, the passages need to be cleaned out with carb cleaner with the red spray straw, and compressed air. Has this carb been cleaned and rebuilt? Also check that the vacuum advance diaphragm isn't cracked, as this will also cause vacuum at the carb to drop or fluctuate.
Kenneth
One additional place to check for a vacuum leak, guys... intake-to-block gasket. Lurnt that one the hard way. :oWorkin Stiff -
Aaron D. IL wrote:
The float level is to low, that will cause the idle to float. WaltI got my 262 going with carter WGD carb... set the timing and the idle. The car should be idling a bit lower (the book says only like 500-600 rpms) maybe but anyways what it's doing when running is ocillating.... the idle speeds up, slows down, speeds up, slows down. When I play with the idle adjustment a bit lower she dies.
Suggestions ?
Idle screws are backed out 1 and 1/2 turns as per the books' instructions. It does accelerate smoothly now that I set the timing.
More clues: disconnected the vac advance and no change. Metering rods seem to be moving up and down with the occilation so I have to assume it's somewhere in the carb.
