Misfires it's still cylinder 5?

2007 LINCOLN MKZ
150,000 MILES • 3.5L • AUTOMATIC
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FREERIDER78
Cylinder 5 misfires. I did a coil swap to determine it's still cylinder 5. When I did the injector pulse test on this cylinder the noid light flashed a few times and then stopped, indicating a problem with the injector circuit but not the injector. Could this be the ECM stopping the signal?
Jun 28, 2026 at 12:45 PM
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STRAILER
  • ✓ASE Certified Mechanic
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Yep, it sure can, injector drivers go bad all the time inside the PCM. Fortunately I believe you can swap out the PCM without programming for this year, I would get a used one from eBay. Let me know how it goes.
Jun 28, 2026 at 5:47 PM
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