So I was driving the other night and my check engine light came on. The car started to run like crap. So I shut it off let it sit and start it up. No code so I drive it home, the next day I am driving to work and it come on again. I cycle the key and when I get to work I pull the code. After looking it up on alldata I see it is my metering oil pump. So I call Mazda and about had a heart attack when I heard them utter 2000 dollars after my discount( I work at a Nissan dealer and we get discounts). So I call the guy I bought it from and he suggested mixing oil in with the gas. Would you all suggest this or is there another idea. I would rather find another metering oil pump to put on but haven't had any luck so far. So that is why I am asking for your alls input. Thanks

 

u could run premix but its a pain in the ***. u get oil on you plus u have to stand out in the cold even longer when u fill up.everyone makes mistakes if u run out of oil. u cant go anywhere till u get more. but yes u could run premix but the only way i would is if i had to or if it was a track car.

u have some luck now i have one off a s4 engine for sale

 

how much would you be asking for it. I am sure it would work on my S5

 

It is an 89, right? IIRC, a code 27 will also throw the equally dreaded "limp mode". The S4 OMP won't work on it. If it does go into limp mode, pre-mixing will help save the engine, but it still won't run right.

Two options make sense to me. First, try to find a good used one. Maybe Kevin Landers has one he could sell you (Rotary Resurrection) Kevin has a good rep, and everything I have got from him in the past has been perfect. Or, www.mazmart.com might have some.

second option....IIRC, R-Tek has an S5 ecu available which eliminates the limp mode, and would let you run without the OMP.. You would have to premix.

Good luck

 

the s4 wont work even if he uses the front plate crank case cover from a s4 block? on a s5 block.. i thought u could use diffrent irons like my neigbor he has a 13b with 12a irons... explain plz

 

i got the omp without the lines and the crank case cover that its in how much is it worth to you 30+ shipping?

 

No OMP=Limp mode=no power.

If he changes the front cover(with water neck), and the OMP, and adds the arm from the throttle linkage, AND gets rid of the limp mode by either tricking the ecu or getting the one from R-Tek, I think he would be ok.

I guess I should have worded that differently..not that it won't work, because it will. It just requires more than just the OMP.....sorry for the confusion...

Jim

 

Premix is not a pain in the ***. Would you rather spend an extra 30 seconds out in the cold at every fillup or live with a faulty system that has the potential to fail and destroy your engine as a result? My 2nd engine went after 10,000 miles because I bought a used OMP and it failed--take it from me, premixing is worth it.

Here's more info on premixing: http://www.fc3spro.com/TECH/FAQ/premix.html

 

ok well I premixed and it hasnt entered limp mode as of yet.(It did go into limp mode BTW when that code got thrown) But I do want to fix it though.

 

How do you premix.? Do you fill up the whole tank everytime so you can get it right? How exact would i have to be on the premixing....

 

you find the ratio and put in however much would equal the ratio depending on how many gallons you put in.

1oz per gallon is a lot, but i usually throw in about 8 gallons and 8oz of premix.
you dont have to be too exact, just know you have enough if not more then suggested.
cant hurt to be too safe right?

 

Yep, you can find used OMP's in the f/s section for less than 100 bucks.

 

premix

S5 OMP's are junk, at least when they are 15 years old they are...

 

yeah thats what im thinking about mine since its an 88. Im considering doing this premix.

DO the fuel injectors have any problem with this?

 

I premix mine. Somwone had a good idea somewhere around here that used a big thing of two-stroke oil and a pump, and basically go two pumps for a tank of gas or something like that. I was thinking of making some container and just fill it up at certain intervals and it mixes with the gas in the tank.

 

It's all answered in the link above.

1986 - 1988 models run a MECHANICAL oil metering pump.
1989 - 1991 models run an ELECTRONIC oil metering pump.

The 1989 - 1991 models running STOCK ECU need to see a working E-OMP.
If not, it'll throw the "27" code and trigger limp-home mode.
So, you cannot swap the OMP's without running into this problem.
You need to address how the ECU is going to react if the E-OMP isn't working right.


-Ted

 

OK. My only concern now is. I do road races and circuit/drift with my car. I do some hard down shifts, sometimes even locking my rear tires. SInce you guys say the injectors cut off and no lub is injected on down rev.. is scares me.

I sometimes go from 4th gear into 3rd into 2nd and the whole time rpms are around 5000 to 7000. Im thinking that alot for the engine to run dry and not be lubed at those hard downshifts. Is this something i should worry about.? Will my engine be damaged if i switch to premix and continue with hard downshifts?

 

Read the link.
It's all in there.
I wrote it.


-Ted

 

One draw-back about the pre-mix system is that the stock ECU shuts off the fuel injectors on decel or anytime you lift off the gas pedal and RPM's are dropping to idle speeds. This can be of a concern, as the stock OMP systems are constantly injecting oil all the time, but the pre-mix through the fuel injectors is not. This is where the before-mentioned pre-mix combustion by-product lubrication comes in - with lubrication already laid down from previous combustion cycles (especially under a heavy WOT run at high RPM's), there's very little worry about proper combustion lubrication.



I must have skipped over this when i read the article. THnx

 

to bad mine isnt 15 years old or I wouldnt be as mad as I am. It is a reman engine with like 30k on it. But never fear the guy I bought it from(A good freind) has one I am picking it up tomorrow. I ordered the gaskets from Mazda(not that expensive thank god) and it should be fixed Tuesday when those gaskets show up. Thanks for everyones input.

 

Ha. Much to my dismay I got another one on there and it is throwing the code. Is it possible I got my hands on a bad one or can it be something else? Is there a way to test OMP's?

 

Can the stock S5 ECU be "tricked"? If so, how? I have an S4 omp, rod, and front cover.