Hey there, new to the forum.

I am checking out an 89 rx7 for a friend and it's throwing a CEL: "Code 26". This refers to an issue with the OMP or MOP. (Not sure the proper acronym you guys use.) Before you start a flame fest in here know that I am ASE certified. I know little about rotaries besides how they work from a theoretical point of view.

I have the proper electrical devises to check if the stepper motors are working properly...but don't have the manual to judge weather they are in spec or not. If you can post these numbers that would be awesome. I figured many of you are familiar with this code, and after searching this forum, I see this device isn't 'required' for a properly running rotary. But my friend is not motor savy and doesn't want to mix in oil at every fill up.

Any help would be appreciated. I'm hoping there is a common problem that causes code 26 to pop up.

Thanks for your time,
Steve

 

The manual is free from many places on the net. One I use most is here: http://www.rotaryheads.com/PDF/2nd_gen/index.html. Others are mentioned in the 2nd gen FAQ at the top of this section.

Code 26 is usually accompanied by codes 27 or 20, which is what we call "limp mode". Fuel and timing are fixed, and the engine loses almost all power. OMP/MOP failure is a common problem in S5 RX7s, and the only real fix is to replace the expensive pump. Often the portion of the ECU that controls the pump will burn up at the same time, which means replacing it as well.

You mentioned that your friend would not want to premix, but it would be the cheaper route. A company called Pocketlogger (http://www.pocketlogger.com/index.ph...age=1&ecu=S5NA) can rechip the S5 NA ECU so it no longer needs a functional OMP. Otherwise, in order to even premix, a working OMP would still have to be plugged in to avoid limp mode.

A 3rd, but much more involved option would be to use an S4 ('86-'88) front cover and mechanical OMP to replace it with the reliable predecessor. This would still require the Rtek chip to prevent limp mode.

 

My friend said he is definitely down to premix. What is involved with deleting the MOP and its components? A quick forum search yielded no results for this delete.

Thanks in advance and thanks for the useful info and especially the link.

 

Taking the pump off and blocking off the area where it was. Removing the MOP lines and oil injectors at their ends. Filling the holes with short, appropriately threaded bolts, and as RotaryRocket88 mentioned above getting the ECU "chipped" to remove the MOP circuit from the ECU.

 

Hey guys,

I also got the CEL on and it gives me error #26, from your discussions that explains maybe why my 7 doesn't boost up properly/power loss! others told me that it's my vacuum lines, but since the ECU flashes 26 then it's definitely not the vacuum lines, because I replaced the vacuum lines with new silicon ones.

So what should i do exactly? Replace the Metering Oil Pump? which costs $1700 from Atkins Rotary.

The ECU also flashes :

23 Fuel Thermosensor
25 PRC Solenoid (3Way Valve)
44 Turbo Control Solenoid

But Not 27.

Please help guys.

Thanks

 

Used OMP's are rather cheap. You can also replace or augment your current ECU to bypass the faltering OMP system.