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Old 09-12-2011, 04:58 PM
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Hesitation/Stalling Problem During Acceleration

I am having a problem with the engine/trans in my 54 Chevy pickup that has me confused.

The problem seems to be a hesitation or stall during acceleration.

The motor is a 350 SBC with a crane cam, stock 487 heads, edelbrock performer intake and 1406 (600cfm) carb. Trans is a fresh TH350 with a 1800 stall and and auxillary cooler. Rear gearing is a 3.42. Mallory HEI distributor and Holley mechanical fuel pump.

The timing is set at 14 degrees with the vac advance plugged. I then reconnect the vac hose to the advance canister. The other end of the advance vac hose is plumbed to the passenger side vac port on the 1406. I have adjusted the vac advance as specd by Mallory.

The engine seems to die then comes back then dies. I let off the gas and it smooths out.

This problem was present prior to the trans swap this past weekend and I thought it was the trans slipping but the problem persists. This seems to happen in the afternoon commute and not the morning commute. Engine temps are 180 in the AM and climb to 200 in the PM.

I have a Vintage Air unit and a Taurus 2 speed fan which turns on the low speed at 180 and the high speed at 195 or when the AC is turned on.
The alternator is a 3 wire 94 amp 12si delco.

Any suggestions as to what may be causing the stall/hesitation?

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Old 09-12-2011, 07:14 PM
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Does it do this from a dead stop/idle, or will it do it any time you accelerate? If it seems to be related to when you hit the throttle from an idle or low-ish speed cruise conditions, try using more accelerator pump shot by repositioning the pump linkage.

If you think it's heat-related, you can insulate the fuel line from any radiant heat, it shouldn't be in direct contact w/anything hot. Sometimes an insulating carb spacer will help, the aluminum body of the Edelbrock carbs seem to be prone to heat soak.
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Old 09-12-2011, 09:54 PM
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I have a 1 inch spacer under the carb now. I will look at the fuel line routing as things are tight where the frame, fuel line and headers converge.

I do not think it is heat related as the truck has been on the road in this basic config for three years and 40,000 miles. However at this time EVERYTHING in Houston is HOT and dry.

Thanks for the suggestions.
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