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Old 11-04-2008, 07:10 AM   #21
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well thats a pretty easy thing to fix. (one identifiable problem... better then ion's gremlins)
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Old 11-04-2008, 11:49 AM   #22
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well.. thats what im hoping what it is
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Old 11-05-2008, 08:28 PM   #23
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Not tryin to jack your thread but, I don't want to start another topic. I am having a similar problem. Getting PO420 code,Crappy MPG, Also exhaust smells very rich. I have a high flow cat would that set a code? I have had it for a year though and the code just came up a month ago? I don't want to replace the O2 sensors if I don't HAVE to. My car has 127,000 miles if that's any help. I know GM recommends to change O2 sensors at 100,000 miles but, is it necessary
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Old 11-06-2008, 05:53 PM   #24
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not sure... man.. i've had the p0420 when i first bough the car
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Old 11-06-2008, 05:56 PM   #25
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a guy i work with was throwing that code, and it was due to a bad gasket around the gascap. he got some putty/epoxy stuff, put that around it, and its gone.

My mom had it, and it was a small leak in the fuel neck itself... had to have that replaced. basically...start from the fuel cap and work your way up to the engine.

doh... wait... those might have been p0404
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Old 11-13-2008, 04:25 AM   #26
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meh more gas problems still only getting 240s per tank.. with problems mehhh
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Old 02-13-2009, 11:12 PM   #27
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Quote:
Originally Posted by 01OldsAleroGt View Post
well scanned it today... its all pointing fingers to being catless.... the sprurattic switching of the O2 Sensors... which they are reading both the same due to the punched out cat..is causing the ECU to dump more and more fuel into the system... so i'll def be investing into my cat and exhaust very VERY soon... YAlero.. you'll be gettin your money to ya as soon as i get it !


bringing this back from the dead to tell you that "sprurattic switching of the 02 sensors" is normal while cruising. if it wasn't switching back from 0-1000mv (usually you'll see something like 80, 940, 420, 880, 17, 780 - you get the point) then something is wrong with it. it is supposed to switch from lean to rich constantly, around the switchpoint (ive seen anything from 450 to 550 depending on the vehicle and its calculated load)
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Old 02-13-2009, 11:14 PM   #28
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Old 02-13-2009, 11:52 PM   #29
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Originally Posted by itsbmw View Post
my car has been eating gas lately.

I only floored it from 0-speed limit about 8 times

well knock it off!

mine was too... but i was driving in 0 degree weather, locked in traffic all the time, AND all my tires were <20psi (oops)

fixed those (yes, i fixed the weather MYSELF) and my mileage is good again.
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Old 02-14-2009, 07:36 AM   #30
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