post ALL codes.

A misfire can be ignition, fuel, mechanical.

 

Thanks jtec I do not have a reader here right now. What I am looking for now is confirmation on spark plug wire routing. The coils are on 1,3,5. do the wires run straight across? ie 1 to 2, 3 to 4, 5 to 6?



Mark

 

No. The wires would have to go to the cylinder that would be on the top of the exhaust stroke when the coil cylinder was top dead center on the compression stroke. 1->4 3->6 5->2

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Well....



The initial misfire was probably resolved with the new coil and wires. The subsequent issues with #4 and #2 fouling were due to those wires improperly installed (swapped). No I didn't do the wires but it was just a mistake that won't likely happen again. FYI I have found the wires are numbered as to which cyls they run to right on the casing. Live and learn.

 

Was the above order I wrote down correct? My 3.7 has a coil on every cylinder.

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Was the above order I wrote down correct? My 3.7 has a coil on every cylinder.

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You are correct.

Thanks!

 

Well I am back. Even though the motor is running smooth as glass she is getting a code for misfire on number 4 and a Catalyst efficiency below threshold (bank 2). The check engine light is coming on about every 30 miles with the issues. since it was #2 and #4 that had the wires swapped I am wondering if we plugged up the cat on that side, is that side bank 2? I just swapped plugs between 4 and 6 to see if the problem moves.



What do I do about the cat fault, replace it. In the old days I'd just cut it out or bust up the guts. Afraid these newer cars might be too smart for that.

 

If you were dumping raw fuel into #2 and #4, you likely ruined the cat. I wouldn't do anything until you figure out the misfire on #4 though. Can you feel a misfire? You say it's running smooth though. Looking at fuel trims would give you an excellent direction to go. A cheap scan tool would be an elm325 Bluetooth obd2 adapter and the Torque app. It's what I use until I can afford a bidirectional one.

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you more than likely have a bad injector on #4. been there too. all t takes is a bit of dirt to get in an mess up just 1 injector.