Author Topic: turr'ble MPG? (Read 783 times)

AzPete · « **Reply #25 on:** October, 06, 2010, 06:40:37 AM »

Then how is it that after market gauges do not use the constant voltage regulator.....they run 12 volts.....

hbar · « **Reply #26 on:** October, 06, 2010, 11:59:57 AM »

Quote from: AzPete on October, 06, 2010, 04:31:52 AM

The mixture screws should show a change on the vacuum gauge. As stated, it sounds like you are idling in the run circuit. What that means is you used the curb idle adjustment to get the car to run. Doing this opens the throttle plates to far and does not allow the fuel to travel thru the idle circuit. The easy way to tell if this is true is if the car idles at all when both screws are turned in gently until the bottom out. If this is happening, then the carb is either out of adjustment or to dirty internally to function properly. The throttle plates should just be cracked open.

I put in both mix screws and the car died, so I don't think that's the case.

AzPete · « **Reply #27 on:** October, 06, 2010, 12:16:28 PM »

Good to know. Now, back them out 1 & 1/2 turns and leave them there. Car should start but may have idle issues where you need to adjust the idle screw only. Make sure the choke opens after the car is warmed up.

Starfury · « **Reply #28 on:** October, 06, 2010, 05:07:35 PM »

Quote from: AzPete on October, 06, 2010, 06:40:37 AM

Then how is it that after market gauges do not use the constant voltage regulator.....they run 12 volts.....

Not sure. Could be they just alter the resistances to minimize the affect of source voltage changes. Could be they have their own little solid state 5V voltage regulator chip. They're plenty small enough to fit inside the housing of any gauge.

hbar · « **Reply #29 on:** October, 08, 2010, 07:07:04 PM »

I haven't touched the carb any further, but after driving the car for a few days w/o tweaking anything, the temperature gauge seems to have inexplicably settled down to right in the center of the gauge. Looking forward to that Holley book coming in so I can start to understand more about the carb than just "turn this screw." Even so, it's running great now, aside from the lousy mileage.