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Old 11-18-2015, 04:00 PM   #1
donaldr
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2007
Default Random - Multiple Misfire Detected

I have a 2007 Saturn aura XE 3.5L 150k miles

Codes:
P0172 Bank 1 system too rich - Confirmed
P0300 Random - Multiple Misfire detected - Confirmed

other notes from OBD
ST FTRM1 (%) goes from -1 to +2 during idle
ST FTRM 2 (%) goes from -2 to +2 during idle

LT FTRM1 (%) hovers around -4 or -5
LT FTRM 2 (%) hovers around -6

Before any check engine light ever turned on, the car would lose power during acceleration in first and second gear, almost as if it were bogged down this happened for a month or so.

Then that problem went away and a few days after while driving uphill the check engine light was flashing and service traction control would scroll across the dashboard. The car was shaky and lost some power, and a really loud whining sound( possibly serpentine belt)
After about 5 minutes of driving the vehicle on a flat surface, the check engine would stop flashing and the service traction control turned off, the only thing left was a whining sound.

Started the car up this morning there was no visible problem except the loud whining coming from the serpentine belt area under the hood.

Not sure if there is anything that connects all of these systems together or if it is multiple problems.

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Old 11-19-2015, 07:33 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: Random - Multiple Misfire Detected

There may be several problems to consider and whether or not one or more are all related may not be answered unless you can provide more info.

With 150k miles on this car, what's the maintenance history, parts replaced? Spark plugs? Throttle cleaned? Air filter? Without some background info, anyone can guess at anything.

Some things to consider; fuel pressure check and partially blocked catalytic converter.

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Old 11-20-2015, 09:58 PM   #3
donaldr
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2007
Default Re: Random - Multiple Misfire Detected

Well I caved in and took it in for diagnostics, came back as bad plugs and plug wires as well as the throttle body needing cleaning.
They also suggested getting fluids changed.

Is it possible to change the tranny fluid myself instead of taking it in. I was told that my tranny was a sealed system.

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Old 11-20-2015, 10:51 PM   #4
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2003 L-Series 3.0L Sedan
Default Re: Random - Multiple Misfire Detected

Its your car. You can do anything you want to it. Transmissions need oil so its filled at the factory. Seals can leak so there must be a way to refill it. And a drain plug to remove oil. "Sealed" is a misnomer in relation to xmission fluid. Normal driving may never wear out lubrication oil while severe use may require replacing oil for long term reliability. As a rule, automatics tend to last without fluid replacement compared to manuals where clutch discs, throw out bearing, and hydraulics need replacement from wear and tear.
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File Type: pdf transmission-fluid-replacement.pdf (84.4 KB, 3 views)

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