Engine Check light is on. Engine shaking.
Diagnostics say #5 misfire. I have replaced all 6 spark plugs and intend to change coil #5, but I can not locate coil #5 because I dont know the order (position) of the cylinders on the engine. Any help?
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Was there a reason for changing the spark plugs, was it giving you a misfire code? I have an 08 mazda 6 and I've changed the spark plugs before without any problems, if the engine is rattling and shaking it may be a misfire from a faulty plug or a bad coil pack atop the spark plug. You should be getting a Check engine light on the dash if so take it to a local Autozone or Advance Auto Parts, they'll check the code for free.
When a misfire occurs, engine speed will fluctuate. If the engine speed
fluctuates enough to cause the Crankshaft Position (CKP) sensor signal
to vary, The Powertrain Control Module (PCM) or Electronic Control
Module (ECM) can determine that a misfire is occurring.
When is the code detected?
- Engine Cylinder #5 and #6 is Misfiring.
Symptoms: - Engine Light ON (or Service Engine Soon Warning Light) - Lack/loss of power - Hard start - Engine hesitation
Possible Causes: - Improper spark plug at cylinder #5 and #6 - Insufficient compression at cylinder #5 and #6 - Incorrect fuel pressure - The injector circuit is open or shorted at cylinder #5 and #6 - Fuel injector #5 and #6 may be faulty - Intake air leak at cyli
Possible Solution: - Perform Injector Service - Replaced Spark Plug #5 and #6 - Replaced Injector #5 and #6 - Replaced Ignition Coil #5 and #6