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Reply To: 2002 Buick Century limited 3.1 v6 no power upon accelerating

#815202
GM Fan
Participant

Usually if its a top end acceleration issue then it spark related (but ive seen it with low fuel pressure too). If i were you id start by replacing the plugs and wires since they could’ve be fouled from the blown head gasket. If its still acting up and you dont see any damage on the engine harness, then id replace the crankshaft poss. sensor and then the coils. If the car was running lean then that couldve been the reason why it blew a head gasket (thats why its possible it could be fuel related and could even cause random misfires). So what i would do in order
1. Replace plugs, wires and fuel filter (maybe some fuel cleaner depending on how old the gas is)
2. Replace either coils and or crank sensor (Bad coils can send bad info to the bad crank sensor, you can test the coils with a multimeter)
3. Check fuel pressure with a gauge, if low fuel pressure (below 52psi) then replace fuel pressure regulator.
4. If the fuel pressure is still low then replace fuel pump.

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