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Stalling problems, Chevy 305

Posted: Sat Jun 06, 2009 4:42 pm
by Stuball
Hoping you guys can help diagnose a couple of problems with my mates chevy astro van (its an automatic)

Running a holley carb (unsure of size) and electronic distributor

Just recently, if you floor the throttle from a standstill, or whilst only just moving, the engine initially revs, then pops back through the carb and stalls., weve tried adjusting the timing to no effect :? Its Not done this before so we are a bit perplexed.

If you floor it whilst on the move it accelerates nice and smoothly

Other problem is when pulling up to a junction and braking firmly the engine will stall say 75% of the time, have fitted a thermal carb spacer but again doesnt seem to have made a difference (although the carb stays much cooler now)

Any help much appreciated!!

Stuball

Posted: Sat Jun 06, 2009 6:22 pm
by Eliot
Check your accel pump - i think a backfire means its too lean (or was it too rich!)
Easy to adjust a click or two either way.
Also check your float levels wrt to stalling on braking.

Posted: Sat Jun 06, 2009 11:07 pm
by Stuball
Cheers for that elliot.

We shall give it a few tweaks tomorrow and see what happens, ta

Stuball