Question about 2007 Pontiac G5 Gt Coupe
Woke up one morning (temps below freezing), and the engine light was on with the words "reduced engine mode". Ran fine the night before. Rough idling around 1500 rpm. Error codes p0123 and p0223. Both are for the tps. Pedal connection not corroded. Any ideas?
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Posted on Jan 02, 2017
Fuel filter issues show up in high demand fuel needs such as passing or going up hills. Rarely do they cause rough idle problems.
Is the check engine light on or flashing? A flashing light indicates engine misfire and should be repaired as soon as possible.
So you could have a vacuum leak, a stuck EGR valve, bad ignition coil, worn spark plug, and many other items.
If you don't have a check engine light and haven't done a tune up do one to eliminate a few items and see if that smooths it out.
If you have further questions ask me and I will check and answer you.
Posted on Jan 04, 2010
Does it have the 2.3l Quad 4 engine? If so replace the plastic piece that the coils go into, they go bad and leak spark to the cam towers and then you get a nice one or multiple cylinder misfire.
Posted on Apr 30, 2010
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