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07-23-2013, 07:02 PM
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#3 |
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Active Member
 
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Tuning my 250 I6
I have an HEI on my 250 and I have the timing at 10º advanced. 10-14 is not too much.
Too much sputtering or popping out the exhaust when decelerating could be a vacuum leak or carb adjustment. Check the vacuum advance to make sure it's not leaking and check carefully around the intake and the base of the carb (I use a short section of garden hose as a stethoscope). Sometimes the middle gasket in the carb body may not be tight enough. Other things to check: Adjust the idle air screw for maximum vacuum with vacuum gauge. Swap spark plugs with different brand (just in case). I'm not familiar with the distributor you are using but if it requires the full 12vdc make sure you have rewired it and eliminated the resistive wire.
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68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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