Weekly the car bucks and always after fill up
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2001 Nissan Sentra Question: bucking occurs after every gas fill up and then occassionally on and off after that
Answer #1patrick mannion from Greg Solow's Engine Room, April 12, 2011, 23:09Master
I wonder if the canister purge valve is sticking open and when you refuel the intake manifold is filling with fuel vapors. I just looked there are two service bulletins from Nissan about the evaporative system having problems.
Answer #2autodude46 April 12, 2011, 23:11Enthusiast
I dont think the bucking is associated with the gas fill ups. Sounds like you have a secondary ignition problem that needs to be fixed. (cap,rotor,wires, fouled sparkplugs, etc.)