Originally Posted by TeamRX8

well I accidently overfilled my engine oil recently. It is so full I cant even tell how much over because it completely covers the dip stick. Yet I ran the last four or five races of the season like this without so much as a single drop of oil getting in my intake

so please keep on with the forum wives tale ....

Originally Posted by Jon316G

Did I miss something?
What does pre-mixing have anything to do with "stuck valves"?

Originally Posted by T-von

I already know what going to eventually happen based on my knowledge of these engines. Here's something you guys need to understand. The lower intake on the S1 and S2 will still be subjected to carbon intake runner build-up over time. VDI sticking open and AUX 5th and 6th port actuators sticking open WILL be a problem with S2 engines also regardless of it's slightly different design. The old S4 and S5 Rx7's had problems all the time with sticking aux 5th and 6th port actuators. For those of you that have never pulled these engines apart, carbon will work it's way far up the intake runners causing those components to stick/freeze open. Revving your engine on a regular bases helps since it keeps these components in operation on a regular bases, however revving still wont prevent the carbon from still building up the runners. This is where I found that premixing was very helpful. Not only is it the absolute best way to lube the rotary combustion chamber and fight carbon, but when the injectors spray the fuel/2 cyl oil mixture, you get an oil film that evenly distributed all over. This film will also work it's way up the intake runners. As long as you have an oil film, carbon can't stick to it.


I personally have a 91 Rx7 NA convertible that I rebuilt 5 years ago that gets granny driven all the time. When I say granny driven, I need shifting at 3k all the time with NO hi rpm revving. The engine have 45k on it. Based on my driving habits, my engine should be carbon infested but it's not. My OMP doesn't work so I've premixed that entire time. My aux actuators still move freely and I haven't driven my car in a year and a half.


Now my advice to all you S2 owners is to premix. Yes I understand Mazda improved the S2 OMP set-up but even that system will never lube the combustion chamber was fell as premixing will. I can assure you that is fact based on how Mazda designed the OMP delivery system.

Originally Posted by templar99

Hi ******!
i used the code reader to re-set the CEL last night. Drove all the way to work this morning without the CEL returning so I'm hoping it was just a weather related fluke. I thought about adding some Lucas Gas Treatment on my next fill up but may try the pre mix instead. What did you use?

Originally Posted by plain ole ******

It has been stated that carbon can gum up the intake valve and premix can possibly help and this was the post I was getting that idea from.

Originally Posted by Jon316G

We do see more "stuck valve" related issues when the outside temps drop.


No.
The link Mazurfer directed you to was created to help pin-point your particular issue because we've seen SSV related codes caused by almost every component of that valve.
You didn't mention the code, so we are assuming its SSV (P2070) because that is the most common, but we've seen "stuck valve" codes for all of them (APV, SSV, VDI).


Most of the "advise" on this forum is randomly throwing ideas at you until you solve it and not much true troubleshooting, which does get frustrating to watch.
But to some degree, you have to test various components so you know what needs to be taken apart to clean/fix/replace.



And as I pointed out before... its not always a stuck valve causing these codes, but another component such as the actuator or solenoid.
In which case "tapping with a hammer" will not help.


If you don't notice issues driving or idling, you'll probably fine to wait until the weather gets warmer.
But keep an eye out for the code to return and if it comes back more frequent, you may need to tackle this sooner.


Did I miss something?
What does pre-mixing have anything to do with "stuck valves"?

Originally Posted by tony.colombo

this happened to e before but it was right after I put in my mid pipe. guess what happened was the screen inside AEM intake got sucked up to the intake opening and hit the intake when opening. good times....

Originally Posted by Jon316G

The first stuck SSV I encountered (which is the same vehicle in my SSV removal video) is from a guy who pre-mixed.
I'm the original owner of my '04 and have never pre-mixed... and my SSV was clean (light film) last time I looked.
But pre-mixing isn't a bad thing anyways so I'm not going to discourage people from doing it, I just wouldn't bet money on it preventing valves from sticking.

Originally Posted by Jon316G

^Well then you continue believing what you like.
You'll realize I don't care to flex my "e-muscles" around here like others do.

Originally Posted by Jon316G

^Well then you continue believing what you like.
You'll realize I don't care to flex my "e-muscles" around here like others do.

Originally Posted by Jon316G

^Well then you continue believing what you like.
You'll realize I don't care to flex my "e-muscles" around here like others do.

Originally Posted by Karack

injecting oil in the intake compensates for low compression for either a junk engine or one that has been severely flooded. you just have to determine which it is in your case. compression test.