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Old 03-28-2013, 05:34 AM
Matty8 Matty8 is offline
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400 tbi problems

I have put the top end from a 350 tbi onto a 400 sbc. After some wiring issues I have the thing running now. But it runs better with the wire connector for the map sensor unplugged. I'm running an inline fuel pump rated at 18 psi. With the map sensor plugged in the engine lopes and won't idle or stay at one consistent speed. However it runs nearly perfect without it plugged in. When the map sensor is unplugged the computer makes the mixture rich right? Is it possible that since it is a 400 instead of 350 that it's not getting enough fuel? I have tried multiple map sensors and triple checked the wiring. The sensors are working fine and the engine is making 20 inches of vacuum.
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