My Ex valves are dirty i know they are and i was wondering if there is any way to clean them up without having to pull the motor apart.

 

Nope. Carbon fused exhaust valves are nearly impossible to clean. I've experimented with them before - I had 8 different valves sitting in 8 different types of solvents and let them sit overnight. It didn't do anything. The only real way to clean off the carbon is to take the valves out and hit them with a stripping wheel followed by a polishing wheel. It's a very time consuming process. It took me a couple of hours to do all my valves:

 

I have a 98' Mazda Millenia (2.5L V6) with 90K on it and the ecu keeps throwing a 02 sensor code, i changed it and its still coming up. Ive herd that the motor in my car is known for throwing codes after carbon fouls the ex valve. So im assuming that's the prob.

 

I'm not sure how fouled valves can cause o2 CELs. Maybe try some Seafoam and see what happens.

 

Use a wire wheel or wire brush. I've used this on a bunch of set of valves and it cleans them up fine.

The face of the valve you won't get fully clean due to the pitting on it from the heat and temperatures, but the stem and the rest of the valve you can clean up fine and without any damage to it.

 

Wire wheel works good. Get a brass bristle one since it's less aggressive than a steel one.

 

Ive cleaned valves before but i was hoping their was some way i could get them cleaned off without pulling the motor apart. such a pain in the ***...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hks85 &raquo;</TD></TR><TR><TD CLASS="quote">Ive cleaned valves before but i was hoping their was some way i could get them cleaned off without pulling the motor apart. such a pain in the ***...</TD></TR></TABLE>


then the only way is a some kind of solvent(SP?). What I did on my b18b rebuild was dip the head in varsol for a few hours then clean it as much as I can with a normal plastic bristle brush and keep repeating the process till my it goe the cleanest possible without taking it appart

 

What is the actual code? Maybe i can help you diagnose it. Should be a P01?? code. There are a ton of 02 sensor codes.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BuddhaSiR &raquo;</TD></TR><TR><TD CLASS="quote">What is the actual code? Maybe i can help you diagnose it. Should be a P01?? code. There are a ton of 02 sensor codes. </TD></TR></TABLE>
Oh man, i dont know. It actually turned off on its own so who knows... well see if it keeps up then ill get it checked and let you know.