Coils and spark plugs

[jimmy olson]

I took my car in for service and was told a diagnostic check showed my spark plugs and 3 of the 6 coils needed to be replaced. After thinking about and looking up info online, I find it odd that the engine ran just fine, my gas mileage was good, and I had no “check engine” light. Thoughts?

 

[Speeder]

I took my car in for service and was told a diagnostic check showed my spark plugs and 3 of the 6 coils needed to be replaced. After thinking about and looking up info online, I find it odd that the engine ran just fine, my gas mileage was good, and I had no “check engine” light. Thoughts?

Why did they run a diagnostic? What's the current mileage and year of your car? Sounds like a money grab to me.

 

[jimmy olson]

I brought it because it would “miss” or “shudder” for a couple of second in lower gears at low RPMs. Otherwise, like up to speed on the highway, it ran perfectly.

 

[joegr]

I brought it because it would “miss” or “shudder” for a couple of second in lower gears at low RPMs. Otherwise, like up to speed on the highway, it ran perfectly.

Their diagnosis of bad coils could very well account for this. How many miles, and what year?

 

[jimmy olson]

Their diagnosis of bad coils could very well account for this. How many miles, and what year?

2019. 65,0000
After doing all that, they determined in was the transfer case and Genesis is covering 60% even though the warranty is up. (I’m not the original owner).

I’m just curious if it’s feasible to have bad spark plugs, 3 bad coils and have not so much as a check engine light.

 

[joegr]

2019. 65,0000
After doing all that, they determined in was the transfer case and Genesis is covering 60% even though the warranty is up. (I’m not the original owner).

I’m just curious if it’s feasible to have bad spark plugs, 3 bad coils and have not so much as a check engine light.

It would be unusual, but not impossible if they are marginal. The PCM counts misfires, but does not trigger the check engine light until the count goes beyond a particular threshold. I have seen this with some Lincoln/Jaguar cars.