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  1. DTC code P0354

    That much I couldn’t tell you... possibly poor quality control.. they should last the lifetime but being the first gen s550 I’d expect some weak points
  2. Engine Misfiring- HELP!

    Generally you start to worry when you see over a 10% discrepancy in compression between cylinders, that being said it is worth noting that they’re all on the same cylinder bank. Consuming coolant is usually the result of a bad head gasket which would explain the compression issues, alternatively...
  3. DTC code P0354

    Just diagnosed this issue on my fbo E-85 2015 Gt. These engine run on two wire coils, the one constant wire found between all 8 coils is the violet wire which gets a constant 12v with the ignition on. while the the other wire is a different color on each coil, these wires go to the pcm. The pcm...
  4. Misfiring even after replacing coils

    Don’t think it’s an issue caused by the wrong coil because it is the same cylinder misfire before and after replacing coils. Also cyl #4 is the only one with a constant ground on the signal wire
  5. Misfiring even after replacing coils

    I unplugged the pcm connector and it lost ground. I tested the wire between the coil and pcm and it’s got good resistance with no continuity to ground until I plug it in on the pcm side. These coils have a constant 12v from ignition in one side and the other wire should be a ground pulse that...
  6. Misfiring even after replacing coils

    Found that I was looking at the wrong coil. I was looking second from the drivers front and it was 4th from passenger front. Found that the coil had melted because it was getting a constant ground from the pcm So the coil was overheating.
  7. Misfiring even after replacing coils

    Would bad compression show ignition coil codes?
  8. Misfiring even after replacing coils

    2015 Ford Mustang GT. 48,000 miles. Catless long tube headers and tuned on E85. Warmed up car and drove 30 seconds before I got a p0351 and p0354 code. Replaced all 8 coils and plugs which were gapped at .030 from the car previously having a Whipple blower on it. New plugs gapped at .050 ...


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