95 Pontiac quad 4 going to spark plugs on 1995 Pontiac Grand Am

smelling gas fouls plugs replace them runs fine then back to the same again.I've changed coils and cap still on going problem.And no codes it ran for a month fine then it started all over again.Can injectors be the problem? leaking when turned off.

by in Salem, OR on November 10, 2013
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3 answers 1 comment
ANSWER by , November 10, 2013
Double check the vacuum hose to the map. Make sure it fits snug and proper. Also check the fuel pressure regulator that it's not leaking raw fuel into the intake causing the engine to run rich.
COMMENT by , November 10, 2013
thank you I'll check those
ANSWER by , November 11, 2013
Not so much leaking, but sloppy injectors can cause over fueling on these. It's not an easy diagnosis in most cases, but you can see the fuel trims taking away fuel, and you essentially find no other reason for false fuel to be making it into the engine under just about all engine loads.
ANSWER by , January 03, 2014
agree with #1