Sn8kebitten
Member
- Thread starter
- #1
TLDR: TVS coyote has good compression test yet intermittent misfire CEL every couple years and have been told sometimes it just happens with these mods and tuning and to clear it.
So I’ve had my 2017 GT auto since new, always changed oil with full syn Motorcraft. At 29k miles in early 2021, I had a used VMP Gen 2 TVS installed with supporting mods and tuned by PBD, so I switched to 5w50 full syn. I made maybe 6 passes at the local track that year in 2 separate test and tunes, but have not since, and I only baby it on the street.
In late 2022 at 40k miles, the CEL randomly popped up while idling in a parking lot. It was the dreaded cylinder #8 misfire. I reset the CEL to see if it was a fluke because there was no audible or physically felt misfire, but it came back within 500 miles about 5 months later (I rarely drive the car anymore).
So in February 2023 I had the shop who installed the VMP and did the datalogs for PBD do a compression test, and all cylinders were 178-185psi so it seemed healthy. They just chalked it up to dirty plugs from the Octanium I used once at the track in 2021 and replaced the NGK plugs.
No problems for 11 months until March of this year. I had 43k miles on the car, the new plugs having 3k, and the misfire code came back during a grocery trip (never going WOT). I contacted the local shop who said sometimes they see this randomly happen with supercharged cars, and to just clear it and see if it comes back.
I did that and now 1000 miles later, it still hasn’t returned and the car drives perfect like always, but like I said I rarely get on it with how loud it is and easy to blow the tires off. So I guess my question is, is this actually a common thing that randomly happens to custom tuned supercharged coyotes? Or maybe the fact that I only put a few hundred miles a month on the plugs and always baby it, they're getting dirty so I need to change them more often?
I just hate to think this engine could let go any day with only a 79mm pulley and 93 tune so I know it’s not making that much power lol. I’d appreciate your opinions. Thank you
So I’ve had my 2017 GT auto since new, always changed oil with full syn Motorcraft. At 29k miles in early 2021, I had a used VMP Gen 2 TVS installed with supporting mods and tuned by PBD, so I switched to 5w50 full syn. I made maybe 6 passes at the local track that year in 2 separate test and tunes, but have not since, and I only baby it on the street.
In late 2022 at 40k miles, the CEL randomly popped up while idling in a parking lot. It was the dreaded cylinder #8 misfire. I reset the CEL to see if it was a fluke because there was no audible or physically felt misfire, but it came back within 500 miles about 5 months later (I rarely drive the car anymore).
So in February 2023 I had the shop who installed the VMP and did the datalogs for PBD do a compression test, and all cylinders were 178-185psi so it seemed healthy. They just chalked it up to dirty plugs from the Octanium I used once at the track in 2021 and replaced the NGK plugs.
No problems for 11 months until March of this year. I had 43k miles on the car, the new plugs having 3k, and the misfire code came back during a grocery trip (never going WOT). I contacted the local shop who said sometimes they see this randomly happen with supercharged cars, and to just clear it and see if it comes back.
I did that and now 1000 miles later, it still hasn’t returned and the car drives perfect like always, but like I said I rarely get on it with how loud it is and easy to blow the tires off. So I guess my question is, is this actually a common thing that randomly happens to custom tuned supercharged coyotes? Or maybe the fact that I only put a few hundred miles a month on the plugs and always baby it, they're getting dirty so I need to change them more often?
I just hate to think this engine could let go any day with only a 79mm pulley and 93 tune so I know it’s not making that much power lol. I’d appreciate your opinions. Thank you
Sponsored
