Wtf?!?!?!

[Doc2012]

http://www.toyota-4runner.org/3rd-gen-t4rs/150802-***misfire-help***.html

Why was this deleted, and by whom? I had asked a question yesterday, and I go to look for a response today, and it's gone? WTF?

SO, I guess I'll ask my question again.....

How does a 02 sensor cause a misfire code? Someone, please, explain it to me. It just doesn't make sense to me.

The reason I'm asking is because I've b een throwing a 3 & 4 misfire code for a couple months. The truck has the obvious misfire sx. Shaky idle, feels like it's got a big ass cam in it, yadda yadda.

I changed the coil packs, changed the plugs, moved the plugs around, SeaFoamed it, injectors on 2 & 4 are new, 1,3,5 & 6 are the stock ones. Compression test yeilded these results:

1-150
3-105
5-165
2-190
4-195
6-195

According to the FSM, the pressure should be a max of 174+PSI, with a minimum of 145PSI, with a difference between cylinders of 15PSI or less.

These numbers show that Cyl 3 is FUBAR. I have a pretty nice TICK TICK TICK coming from 3, so I think it's a valve not closing all the way.

This, however, DOES NOT explain the #4 Cylinder misfire.

I don't have the money to do an engine swap ATT, and I need to get this figured out.

If you might know something, help me out.

 

[EraSevera]

I had a similar symptom with my Subaru 2.5 boxer engine. It was throwing a code for a misfire on one of the cylinders. I did what you did in replacing ignition parts until I finally did a compression test and found that the misfiring cylinder was slightly lower than the rest (a difference of about 10-20 psi) It turned out that I had burnt a valve. Part of the valve seat had been overheated and was deformed, causing a bad seat.

I took the opportunity to change my timing belt while I had the cylinder head off. Then I totalled the car a few months later. :lookout: :facepalm:

 

[SV_Dude]

It's back. Closing this thread so there isn't duplicate threads.