Cold starts - The 1947 - Present Chevrolet & GMC Truck Message Board Network

85Silveradoin04 · 07-09-2004, 06:07 PM

I have had an on going issue with my cold starts.

To back track a little, I recently found that I had a magnetic pickup issue in my distributor. Replaced the guts and put it back together.
The truck always idled at around 1000RPM out of gear, 800RPM or so in gear. I could never really get it any lower, even with the idle screw backed all the off of the throttle linkage of the carb. After repairing the distributor, I wound up retiming the thing to 10 BTDC at 800RPM and I have to tell you it runs beautiful now. Now it purrs at 650RPM in gear. Truck runs cooler and my gas mileage is better. I think it was just way to far advanced.

The carb is a refreshed Holley with electric choke. As the choke works fine and all (Cold start is 1500RPM) I think it tends to come off (with-in 30-45 seconds) to quickly. In another words, the truck spits and sputters at 500RPM or so after the choke is warm but the engine is still cold. Its not until the truck reaches operating temp (185) it gets stronger. Make sense?

Do they make a stiffer coil for the electric chokes?

07-09-2004, 06:07 PM	#1
85Silveradoin04 Registered User Join Date: Jun 2004 Posts: 64	Cold starts I have had an on going issue with my cold starts. To back track a little, I recently found that I had a magnetic pickup issue in my distributor. Replaced the guts and put it back together. The truck always idled at around 1000RPM out of gear, 800RPM or so in gear. I could never really get it any lower, even with the idle screw backed all the off of the throttle linkage of the carb. After repairing the distributor, I wound up retiming the thing to 10 BTDC at 800RPM and I have to tell you it runs beautiful now. Now it purrs at 650RPM in gear. Truck runs cooler and my gas mileage is better. I think it was just way to far advanced. The carb is a refreshed Holley with electric choke. As the choke works fine and all (Cold start is 1500RPM) I think it tends to come off (with-in 30-45 seconds) to quickly. In another words, the truck spits and sputters at 500RPM or so after the choke is warm but the engine is still cold. Its not until the truck reaches operating temp (185) it gets stronger. Make sense? Do they make a stiffer coil for the electric chokes?



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