My mother purchased a Toyota Avalon for my college age brother to use. With only a hundred and ten thousand miles comma we assumed that being a Toyota it probably would not break down. A short while later the engine began jumping and behaving erratically.
We attempted to have it diagnosed by the dealership. They did their $75 checkup and informed us it was time to replace a belt. I explained to my mom that they had charged her $75 to tell her what maintenance was suggested at the current mileage. We then took it to the nice people at aamco for a free diagnosis.
It IS misfiring on cylinder 4. First thing we did was replace spark plugs. This is no fun on a 6 cylinder… The one that was misfiring is actually in front but obviously I replaced them all. SAME PROBLEM
I replaced the ignition coils next. They were clearly beyond their expiration as you can see straight through to the red indicator.
And here I am now.
Logic says one of two things is occurring… But I may be wrong.
fuel injector is not getting fuel to the cylinder. The line could be bad or the injector could be clogged
the wire supplying power to the ignition coil could be bad
MY PLAN TILL NOW
I plan on disconnecting the fuel pump relay, pulling the plug and coil, and checking for a spark. Obviously this is to see if the electric supply is the issue.
If anyone has any insight as to how to make this diagnosis any easier, or a step by step process in either/or most likely to least likely… Or least expensive to most expensive…
I would greatly appreciate it