Quote:
Originally Posted by leem99
ive checked all wires all look ok i have found i have a weak spark on 12 and 4 and a strong spark on plug 3. no idea why. im guesing the welding has caused a issue. maybe coil pack or ecu issue. very strange. never seen this before.
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The coil pack is driven directly by drivers in the ECU. the ECU's are very sensitive to static (this includes spikes from welding)
It's not an immobiliser issue if the engine starts.
How are you testing for spark? it's dual coil. So it's very rare to have a good spark on 1 cylinder and not the other three, they usually fail in pairs.
Where did you do welding on the car?