the 4cyl BMW's are bad about the plug wires going bad. they may ohm good but will still skip. The best way to check is when the engine is cold crank it up and measure the temp on each exhaust pipe at the head. if you dont have a temp gun spray them w/ a pump spray bottle. the skipping cyl will not burn the water off. Then replace just that wire with a known good wire. IT helps to have a few donor cars around the shop. Or switch wires between cylinders and see if it changes cylinders. if no change try swapping coils or plugs between cylinders to isolate which part is bad. |