You showed 3 spark plugs is one of them Cylinder 6

 

Do you have adjustable camshaft gears have the camshaft or timing chains been altered or adjusted lately

 

The first log on the first page shows cylinder 6 was misfiring a lot.
The dirt is because I was using Z1 intake heads that come with their cold air intake kit. I think their ability to allow more air helped in also getting a lot of dirt and dust in. It's also that I live in a dusty area in the first place.

And for the STP, a very bad stupid move of me because I was eager to use seafoam which it's not available for sale around here so I went with STP.


I received it once showing P0300 random/multiple misfiring. Plus the usual codes for O2 sensors due to not having catalyst converters and only test pipes.

 

No. I didn't take a shot for plug No. 6 because I cleaned it up a couple days before the day that I worked on the car TBs and the rest of the plugs on the post with the 3 plugs.

 

Okay what did plug number 6 look like when you originally pulled it out also what about cam gears timing chain

 

Also just my opinion you should never need to use seafoam as long as you change the oil on time use good fuel and keep the engine clean inside I put 80,000 miles on a Mazda Protege5 using mobile one when I tore the motor apart it looks brand-new there was almost no measurable wear on the cylinders no discoloration in the valve train parts or no serious carbon buildup on top of the Pistons or valves except the exhaust of course

 

It looked slightly worse than the other plugs with more blackish deposits on tips and threads.

No aftermarket gears. All OEM without any tuning.

 

Well it's number 6 is darker more carbon it sounds like it's some sort of ignition problem which would probably be a coil on number 6 did you switch packs around

 

Also are you running a wideband AFR meter

 

And yes or no on the check engine light

 

I would have to look at the engine firing diagram what is Cylinder 6 is farthest away from the throttle body on that bank and the O2 sensors are reading misfire they will supply more fuel as a safety measure so that the motor won't lean out and have detonation in that case if Cylinder 6 is farthest away from the throttle body it would be the most carbon plug

 

Hope I didn't lose you there

 

What does the car idle at

 

Actually cylinder 6 is the nearest to the left throttle body (driver view)





No CEL

No because the OEM O2 is already a wideband sensor. I only need to log some data. But No gauge available.

Didn't switch packs. Because after cleaning the plugs, all the cylinder was almost acting the same with average 1 or 2 misfires in 10 driving cycles. I would like to fix that and see no misfiring at all.

It's cool. I was just doing somethig and got a lil busy

650 without a/c that I'm sure of and I think it's 850 with a/c on. Not sure though.

 

And it accelerates smoothly