Vehicle: 2011 Toyota Camry Hybrid. 129,000 miles.
I do all the maintenance on it. Use Mobil1. Replaced spark plugs at 103,342 miles. I have Techstream software on a laptop with the OBD usb connector.
At about 125K miles, engine started running a little rougher when cold. at 126K I got a check engine light, and noticed also a mild decrease in MPG as reported on the dash.
Running techstream, it indicated cyl 1 and 3 misfire, and also an "all" cylinder misfire. As I had replaced the plugs, I opted to replace the ignition coils. Bought a full set of 4 at Autozone and installed them. I also ran a bottle of Techron in a half tank.
Engine ran much better, gas mileage seemed to be back to normal (about 32 to 33 mpg), and I passed the smog check no problem.
HOWEVER, now my MPG is way down to 24 mpg (!!!) I think I may smell gas occasionally, not sure. I did have some rough running, including one little bit of severe roughness that was matched with a new check engine light, and a cylinder 3 misfire.
I cleared that code a few hundred miles ago, and the check engine light has not come back, but my MPG is still very low.
Things I am wondering:
- I bought Denso plugs - could they have been counterfeit, and are now failing?
- Is one of the new coils failing?
- Do I have an injector problem?
- Is there something else I should consider?
Any comments or thoughts are appreciated.