Quote:
Originally Posted by Wizard
... Plus, according to the video the system goes lean during the studder. Which tells me it's not spark related...but probably more towards fuel and or fuel control....
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A 02 sensor only reads air, if a cylinder miss fires there is a lot of air that comes out, because it did not burn the fuel. So a wideband will read this as lean, or a narrow band might catch it, but the sample rate of a data logger or scanner is so slow it might not catch it.
To better help this guy we need a full mods list, and whats wired up on the interior. Check to make sure the MAS, coil pack, PTU, cam/crank sensors, o2 sensor, injectors all have a good connection. Then look at the ECU wiring, I have seen people use the ECU sensor ground for things like gauges, WB o2s etc, this will burn up a small part of the board and cause problems.
~John
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