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Old 01-06-2012, 01:30 PM   #1
harley_trip
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Wrench Cylinder Misfires

My son has a 2003 Vue AWD with the V6. 120,000 miles on it. It runs rough on acceleration. He changed the plugs (but not the coils, still learning).

He failed the Emmision test. I pulled the codes:
P1780 ?
P0300 Random/multiple cylinder misfire
P0303 Cylinder 3 misfire
P0301 Cylinder 1 misfire
P0128 ?
P0700 Transmission Control System

The Misfire codes are the same as before he changed the plugs.

Any help would be appreciated.
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Old 01-06-2012, 02:50 PM   #2
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2005 VUE 3.5L
2007 VUE 3.5L
Default Re: Cylinder Misfires

According to attached service manual extract just about anything other than low tire air pressure can cause misfire.

Let me know if you'd like any of the support documents (listed in blue).

Also, would a breakdown for each code help?

See if the engine temp gauge is reporting normal temperature. Many fuel decisions are based on accurate temps.
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Old 01-06-2012, 06:32 PM   #3
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Default Re: Cylinder Misfires

Has the 100,000 mile service been done to the vehicle yet? The important item associated with that is the timing belt replacement. For the po128 you need to replace the thermostat.
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Old 01-07-2012, 09:59 AM   #4
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2003 L-Series 3.0L Sedan
Default Re: Cylinder Misfires

The P0700 is the ecm saying the xmission control module (TCM) sent an error code (P1780). P1780 is the tcm not receiving acknowledgement from the ecm to reduce engine torque so it generated the error code. One module is blaming the other module.......................................

Ignore the above two codes as they're most likely bickering modules and the more pressing problems are the remaining error codes that can be separated into two areas. Whether one affects the other remains to be seen.

P0128 is as mentioned; replace the thermostat. Whether this would contribute to misfiring depends on how cool the engine runs. Most t-stats fail by running the engine cooler and if very cool (what's the temperature needle position?) this can force the engine to run richer fuel mixtures to contribute to misfiring.

The misfiring issue from all six cylinders, P0300, may be caused by a dirty maf sensor and/or throttle actuator. Both can be cleaned; maf sensor sprayed with maf sensor cleaner, throttle actuator cleaned with throttle cleaner and wiped. P0301 and P0303 may be a faulty ignition coil pack ($$$). It would help to know the condition of the spark plugs when they were removed for replacement, especially cylinders 1 and 3 and if they were in the same condition as the rest.

A general misfire (P0300) can be a combination of excessive fuel mixtures (poor fuel mileage) that may be from a worn out t-stat and/or dirty maf sensor/throttle actuator. The P0700 and P1780 are probably from the misfiring issue/rough running engine.
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Old 01-07-2012, 01:16 PM   #5
sideup66
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2003 VUE 2.2L
Default Re: Cylinder Misfires

No offense but the best way to clear this up would be to reset the computer with a battery terminal pull, which will clear all the stupid codes, then drive the car until the check engine light/service light come on then check your codes. This will probably clear anything stupid caused by a misreading sensor out. Unless youve already identified the pressing issues...
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