2021 3.5L Powerboost Cylinder 6 Misfire Detected

[HammaMan]

The first step should have been to check the spark plug wires with a VOM.

I've now moved from bot suspicion to leaning more towards it's a bot.

Sponsored

 

[FaaWrenchBndr]

The first step should have been to check the spark plug wires with a VOM. There are specifications for the Ohm reading from plug wires and if a wire is out of spec then the decision is whether to replace the single wire or all the plug wires.

When cars were introduced with Cat converters and ran at higher temperatures to reduce fuel emissions, overheating was a common problem and this extended to baking the insulation of the plug wires. Testing the plug wires used to be commonplace but this has been forgotten.

If a coil is not producing sufficient voltage it would affect all the cylinders and not just one. It would be most noticeable when accelerating where a weak spark will cause the engine to "stumble".

We have so few mechanics that are able to diagnose auto problems and so they replace part after part until the problem seems to be fixed. They cost their customers a great deal of money in the process.

so help me out with this……

How is it, exactly, that you would check spark plug wires on a 2021 3.5L
can you explain that?

Also, while you’re at it, you care to explain how as you say it the coil would affect all the spark plugs?

Have you ever heard of the term coil on plug?

 

[FaaWrenchBndr]

I've now moved from bot suspicion to leaning more towards it's a bot.

this or on an acid trip back to 1972

 

[dochawk]

this or on an acid trip back to 1972

Hey! I have brand new spark plug wires on my '72!

hmm . . . [insert evil genius mode] . . . how about converting a 1972 Cadillac 500cid to COP . . .

 

[FaaWrenchBndr]

Hey! I have brand new spark plug wires on my '72!

hmm . . . [insert evil genius mode] . . . how about converting a 1972 Cadillac 500cid to COP . . .

as do I, ‘72 MGB with a 3.4L v6 conversion

 

[dochawk]

can the frame actually handle that???

[I sometimes wonder what full throttle would do to the frame of a 90s cadillac if you managed to defy a couple of laws of physics and mount the 500 in it . . .]

 

[rack04]

Why would replacing the ignition coil on cylinder 5 fix the misfire on cylinder 6? Or typo?

Sorry for the late reply. I replaced the coil on cylinder 5 and 6 because the code was moving between both cylinders.

I did get an update from the dealership today. They're seeing misfires on most of the cylinders, but only cylinder 5 and 6 are above the threshold for the check engine light. Their words not mine. They asked if I perhaps got bad gas but I have filled up multiple times at different stations running empty between each fill up. That was my first thought so I even tried premium 93 octane. I'm using reputable gas stations, i.e. costco, bucees, and walmart. They're going to do some more diagnostic tomorrow to try to get to the bottom.

 

[trdtuner7]

Did you ever get to the bottom of this??

Sponsored