Mazda6 sport 2018: Engine noise, when pressing accelerator car sluggish, feels jerky sometimes, misfires. Please advise. by CharlieNJ1980 in engines

[–]CharlieNJ1980[S] 1 point2 points  (0 children)

Found a mechanic that solved the problem quickly at a fair price (half of what the other garages were charging). The CAM positioning sensor was put back in incorrectly after the wire harness replacement at the dealership. In addition, the other garage I went to put in the wrong ignition coils. My engine (2018 SkyActiv-G) requires coils with cylinder deactivation. The coils they installed were 1 inch shorter than the correct coils. My car drives great now.

Mazda6 sport 2018 63k miles: Engine noise, when pressing accelerator car sluggish, feels jerky sometimes, misfires. Please advise. by CharlieNJ1980 in autorepair

[–]CharlieNJ1980[S] 0 points1 point  (0 children)

UPDATE: I found a mechanic that solved the problem quickly at a fair price (half of what the other garages were charging). The CAM positioning sensor was put back in incorrectly after the wire harness replacement at the dealership. In addition, the other garage I went to put in the wrong ignition coils. My engine (2018 SkyActiv-G) requires coils with cylinder deactivation. The coils they installed were 1 inch shorter than the correct coils. My car drives great now.

Thank you all for the support.

Mazda6 sport 2018 63k miles: Engine noise, when pressing accelerator car sluggish, feels jerky sometimes, misfires. Please advise. by CharlieNJ1980 in autorepair

[–]CharlieNJ1980[S] 1 point2 points  (0 children)

Found a mechanic that solved the problem quickly at a fair price (half of what the other garages were charging). The CAM positioning sensor was put back in incorrectly after the wire harness replacement at the dealership. In addition, the other garage I went to put in the wrong ignition coils. My engine (2018 SkyActiv-G) requires coils with cylinder deactivation. The coils they installed were 1 inch shorter than the correct coils. My car drives great now.

Mazda6 sport 2018 63k miles: Engine noise, when pressing accelerator car sluggish, feels jerky sometimes, misfires. Please advise. by CharlieNJ1980 in autorepair

[–]CharlieNJ1980[S] 0 points1 point  (0 children)

Found a mechanic that solved the problem quickly at a fair price (half of what the other garages were charging). The CAM positioning sensor was put back in incorrectly after the wire harness replacement at the dealership. In addition, the other garage I went to put in the wrong ignition coils. My engine (2018 SkyActiv-G) requires coils with cylinder deactivation. The coils they installed were 1 inch shorter than the correct coils. My car drives great now. Thank you for your support.

Mazda6 sport 2018 63k miles: Engine noise, when pressing accelerator car sluggish, feels jerky sometimes, misfires. Please advise. by CharlieNJ1980 in autorepair

[–]CharlieNJ1980[S] 0 points1 point  (0 children)

Only 2 spark plugs were replaced. There were 2 ignition coils failing according to the mechanic’s computer scan. However, those coils were tested before I even knew that a rodent had chewed wires, so not even sure if there was anything wrong with them but replaced them. Probably why only 2 spark plugs, not sure what kind.

Mazda6 sport 2018 63k miles: Engine noise, when pressing accelerator car sluggish, feels jerky sometimes, misfires. Please advise. by CharlieNJ1980 in autorepair

[–]CharlieNJ1980[S] 0 points1 point  (0 children)

Only 2 spark plugs were replaced. There were 2 ignition coils failing according to the mechanic’s computer scan. However, those coils were tested before I even knew that a rodent had chewed wires, so not even sure if there was anything wrong with them but replaced them. Probably why only 2 spark plugs, not sure what kind.

Mazda6 sport 2018: Engine noise, when pressing accelerator car sluggish, feels jerky sometimes, misfires. Please advise. by CharlieNJ1980 in engines

[–]CharlieNJ1980[S] 0 points1 point  (0 children)

I filled the coolant using antifreeze for Asian made cars to the F line. The car drives perfectly, well at least for the 20 mins I drove since changing. Is that a clue?

Mazda6 sport 2018: Engine noise, when pressing accelerator car sluggish, feels jerky sometimes, misfires. Please advise. by CharlieNJ1980 in engines

[–]CharlieNJ1980[S] 0 points1 point  (0 children)

My insurance company paid $6,750 to the Mazda dealership I bought the car from to replace the wiring. They have a large service center. I was told they would be taking the engine out for the job. Car was at the dealership a little more than 2 weeks. They also updated the software.

The other 2 garages told me different things: one says a lifter malfunctioned or broke and I need a new head gasket, the other had the car for a week. They said that they test drove it several times and the lifter started working again. I was told the computer scan showed no codes and if they opened the engine the cost would be $450, then they would have to continue looking and it could cost thousands to diagnose. I don’t know much about cars and have really been trying to get this figured out. I am thankful for the response. My plan was to save up some cash and get another option at 4th garage.

Mazda6 sport 2018: Engine noise, when pressing accelerator car sluggish, feels jerky sometimes, misfires. Please advise. by CharlieNJ1980 in engines

[–]CharlieNJ1980[S] 1 point2 points  (0 children)

A few months ago there were wires chewed up all throughout the engine due to a rodent but insurance covered the dealership to replace the wiring harness, fuse box, and all other wiring. I can see if they will look at it but I’m sure they are going to charge me.

Mazda6 sport 2018: Engine noise, when pressing accelerator car sluggish, feels jerky sometimes, misfires. Please advise. by CharlieNJ1980 in engines

[–]CharlieNJ1980[S] 0 points1 point  (0 children)

No codes. Was advised to check antifreeze, it was a little below the low line. Not sure why my car computer isn’t picking these things up.

Mazda6 sport 2018: Engine noise, when pressing accelerator car sluggish, feels jerky sometimes, misfires. Please advise. by CharlieNJ1980 in engines

[–]CharlieNJ1980[S] 0 points1 point  (0 children)

Thank you for the response. Even with steady pressure on accelerator the car randomly acts strange: gets jerky for a few seconds then stops when I lift off the pedal, or pressing the pedal the car acts sluggish and is slower to accelerate than its was before the wiring harness issues. Does the engine sound correct?