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2005 Grand Am missing and gas hog issues
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Trvsh5
Novice
Jun 10, 2010, 7:20 PM
Post #1 of 12
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2005 Grand Am missing and gas hog issues
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We have tried changing the plugs, wires, oxygen sensor, and fuel fliter. Also cleaned the mass airflow sensor. Over the last year it keeps getting worse, the only code it throws is the oxygen sensor even after we changed it. When starting to take off and going under 40mph is runs real rough like misfires. Also when sitting idle for awhile like to warm up, sometimes when I get in the car it smells like gas. The fuel millage has went from 320 to 240 in the last year. I have been told it could be the fuel regulator or the cadillac converter but most mechanics say there is nothing wrong with it...boy are they wrong. It runs so rough its scares me to drive it. Please help before it nickles and dimes me to death playing the guessing game.
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Hammer Time
Ultimate Carjunky
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Jun 10, 2010, 7:24 PM
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Re: 2005 Grand Am missing and gas hog issues
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What are the exact code numbers being set?
What engine does it have?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jun 10, 2010, 7:24 PM)
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Trvsh5
Novice
Jun 10, 2010, 7:32 PM
Post #3 of 12
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Re: 2005 Grand Am missing and gas hog issues
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Im sorry I dont remember the code I can tell you tomorrow after we read it again bc the light came back on tonight. It has the V6 Engine, Im reading online now and it says maybe the timing is off, would that make it eat gas too?
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Hammer Time
Ultimate Carjunky
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Jun 10, 2010, 7:34 PM
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Re: 2005 Grand Am missing and gas hog issues
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I need the code numbers
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Trvsh5
Novice
Jun 10, 2010, 7:36 PM
Post #5 of 12
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Re: 2005 Grand Am missing and gas hog issues
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Ok I know it was the front oxygen sensor but I dont know if it says anything else. I will get the exact code tomorrow morning when I get to work.
Thank you for your help
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Hammer Time
Ultimate Carjunky
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Jun 11, 2010, 2:23 AM
Post #6 of 12
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Re: 2005 Grand Am missing and gas hog issues
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There are no less that 20 different codes related to oxygen sensors and they all mean something different.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Trvsh5
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Jun 11, 2010, 5:11 AM
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Re: 2005 Grand Am missing and gas hog issues
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Ok it was not the oxygen sensor code this time it was a random misfire code P300. Now were really lost :(
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Hammer Time
Ultimate Carjunky
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Jun 11, 2010, 6:19 AM
Post #8 of 12
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Re: 2005 Grand Am missing and gas hog issues
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How old are the plugs and wires?
I suspect it will set the O/2 codes again eventually and that will help identify the problem.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Trvsh5
Novice
Jun 11, 2010, 6:36 AM
Post #9 of 12
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Re: 2005 Grand Am missing and gas hog issues
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The wires are less than a year old and the plugs are 3 days old. I got good plugs and wires not the cheap ones. Ya im thinking the same thing, just hoping its not the timing chain and it leaves me standed one day lol
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bambam70
User
Jun 11, 2010, 11:16 AM
Post #10 of 12
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Re: 2005 Grand Am missing and gas hog issues
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does that have the quad 4 engine in it ? either way 4 or six, have you done a power balance on it ? using a test light grounded push it into the wire plugs where they go on the coilpack. make sure all cylinders are firing. sounds like your misfire may be an ignition prob. if you ground one of them and it does not react, thats your prob, that will also make it run rich, causing the o2 sensor to set codes. may not be your wires, may be a prob with your coil paks.
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Trvsh5
Novice
Jun 13, 2010, 6:42 PM
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Re: 2005 Grand Am missing and gas hog issues
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We have not done that yet, they have tested the wires and plugs but not to the coil. It does have the V6 engine. I think you might me right bc it has issues starting at times it just did it again tonight where it didnt want to start then i tried again and it started and shut off then on the third try after it started i hit the gas to keep it running, after that it ran fine on the way home. I think im going to try some GM fuel injection cleaner and have the coils tested. Thanks for all your help
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Sidom
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Jun 13, 2010, 7:17 PM
Post #12 of 12
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Re: 2005 Grand Am missing and gas hog issues
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You don't want to probe the boot like that with a test light. It puts a hole in the insulate boot and will let the wire arch. Basically it ruins the wires, we're talking high voltage here and don't want any type of leak in the insulated boots or wires.
That's an old school test that actually works pretty good. If you want to do it without ruining the wire, get some 2" sections of vacuum line, super glue a spark plug tip into one end for the wire so the wire will snap on to it and put it in line between the wire & coil pack and then fire up the engine. Now you just need to touch the piece of vacuum line with the test light & it will ground the cyl without ruining the wire........
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