1999 Mazda 626 Cylinder 1 Misfire

1999 MAZDA 626
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UNCLE
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  • 1 POST
I have a 1999 Mazda 626 that has a cylinder 1 misfire. I have changed plugs, wires, coil, injector, and oxygen sensors using only OEM parts. Still, this car is misfiring on the #1 cylinder! All cylinders are at 180 pounds on compression tests, and the plug IS firing. What am I missing?
Feb 3, 2006 at 1:51 PM
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COSMO
  • ✓Experienced Mechanic
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If you car is a 4cyl I would have a good look at the ignition coil that is on the side of the cyl head (this also applies to the v6) and look for any disdoloring inside the wire holes and look for cracks or arcing on the body of the coil. Also it would be a good idea to make sure the intake manifold gskt (4 cyl) is not leaking.

Cosmo...Mazda Tech
Feb 4, 2006 at 6:17 AM
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Suggested Repair

Inspect the ignition coil on the side of the cylinder head for discoloration inside the wire holes, cracks, or arcing on the coil body. Also check the intake manifold gasket for leaks on the 4-cylinder engine.

Conversation Summary

A 1999 Mazda 626 has a persistent cylinder 1 misfire after OEM replacement of the plugs, wires, coil, injector, and oxygen sensors. Compression is even at 180 psi on all cylinders and the plug is firing. The expert advises inspecting the coil on the side of the cylinder head for discoloration, cracks, or arcing, and checking the intake manifold gasket for leaks on a 4-cylinder.

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