Question about 2004 Pontiac Sunfire
Car idles very rough have changed plugs, ignition module, coils and map sensor
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Posted on Jan 02, 2017
SOURCE: 2003 grand am 3.4 code p0304
More likely a plugged injector as that code is specific to cylinder # 3 These engines are also very prone to failed intake manifold gaskets and stuck valve lifters. I think I'd start with a compression test, if that's good, go injector. If the compression is bad, you've got a can of worms. Hold off on the O2, I don't think it's related.
Posted on Mar 14, 2009
If this car uses an electrically heated O2 sensor, the heater portion may be bad. If the car has a lot of miles, the O2 sensor may be getting bad also.
Posted on Aug 17, 2009
hi dispite all your hard work the error says you have a missfire /random cylinders hope this helps if so give the answer a rating please thanks pete
Posted on Nov 24, 2009
If the liquid smells like antifreeze its a blown headgasket or cracked head, if it smells like gas it could even be a stuck injector or a bad fuel pressure regulator. I would like to say it is uncommon, but its not that uncommon for a quad motor to have a headgasket issue sometime.
Posted on Jul 27, 2010
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