Random Multiple cylinder misfire

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Old 03-04-2009, 02:33 PM
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Default Random Multiple cylinder misfire

I have been experiencing an random multiple cylinder misfire code P0300, on cylinders 1 & 4. I just replaced the spark plugs with a proper gap, all the coil packs because they were never replaced before hand and the car has 125k. You could feel it misfire under full boost before I did the ignition coils. Now its only throwing a code when im driving at constant speed, not accelling or decelling. I have no idea what the problem could be, egt's, icm's...... Any suggestions on a course of action would be greatly appreciated
Old 03-05-2009, 06:32 AM
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Default check all vacuum hoses and boost hoses for leaks.

use your vagcom and log your egt values and O2 values to see if they aren't right.
Old 03-08-2009, 12:48 PM
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Default Arrghh - I think its the O2 sensors

The car just threw these two codes,
16518 P0134 O2 Sensor Circ.,Bank1-Sensor1 No Activity Detected
and
16538 P0154 O2 Sensor Circ.,Bank2-Sensor1 No Activity Detected
And now its misfiring like a SOB on most of the cylinders, does anyone know where I can get the front O2 sensors for less than 145 a peice?
Old 03-09-2009, 05:35 AM
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tried VAST?
Old 03-12-2009, 06:07 AM
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Yea but those are spliced universals, i found some authentic bosch ones for 110 a peice
Old 03-12-2009, 06:50 AM
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gotcha; however, the VAST ones are also sheathed, which is quite important.
Old 03-12-2009, 08:13 AM
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Huh, is ther a way to sheath them myself?
Old 03-12-2009, 11:21 AM
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it's a tight weave, so I can't think of a way off-hand.
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