joel91

I have an S5 which i know has an electric oil metering pump differing from the mechanical of the S4s..but what i need to know is that i have 800 miles since i did an oil change and i've have been checking the level every week and have only added not even a 1/4 of a quart to the oil...im a little worried is this normal for an S5??? The motor has approx 40,000 miles on it..... I checked for codes for the omp but no codes in ecu...doesn't the ecu check the position of omp to make sure its working right and if not will throw a code...can someone shed some light on this for me.
thanks

joel91

I did read the fsm but i'm just wondering since the ecu monitors the position of the metering pump stepper motor if the system wasn't working it would throw a code right?????

CSM RX7

I'm thinking that the ECU would only throw a code if there was a bad connection or a bad unit. The fact that you've used up 1/4 quart shows that it's pumping somewhat, which means the ECU would still assume it's a working unit. And it probably is. If you're concerned about the amount of oil being injected into the motor, then check the fluid connections on the pump and on the injectors. They could possibly clog and reduce the amount of flow. However, if you're going to check them, you're going to have to remove them all anyway, so I would just get a new set of tubes from mazdatrix or something. I had to replace mine because they broke when I was messing with the intake and injectors. I've never had any problems and the ones I got from mazdatrix were bent in a way that it was hard to connect them wrong.

It doesn't really sound like anything to worry greatly about, but definitely worth checking into.

Hope this helps,
Monty

BlaCkPlaGUE

The electric one is alot more accurate and efficient to pumping oil I would think. Or else mazda would NOT have gone to it. The mechanical one is alot more reliable, and I think if less oil consumption and more efficient oil metering was on their agenda, they would change to electric.

Like CSM said, it probably checks to see that oil is being distributed properly, or else it throws a code, but it can't tell if the lines are fucked, clogged or cracked. If I were you, I'd just get myself some SS braided lines, just to eliminate a possible and potential future problem with the whole OMP thing.

Icemark

The electric MOP is supposed to be a little more stingy/accurate on the output, as it is controlled by the ECU which is monitoring Load, rather than throttle position as all the mechanical ones operate by.

So yes, oil consumption will generally be less, but could be more if you use the engine for load braking and the like.

patman

iTrader: (3)

it depends how you drive. 1/4 qt in 800 mi is reasonable for easy driving. if you have been driving really fast, thats not enough.

pat

joel91

yea...i really don't get on it that much so i guess its probably normal, if you look close enough at the oil lines can maybe with a light can you see the oil moving up the line???

2Lucky2tha7

iTrader: (3)

EXCELLENT INFO:
I talked to a reputable guy at MAZMART a couple months ago about the OMP's. His final advice on the matter is that the electric series 5 OMP injects less oil than the mechanical series 4 OMP, and was actually the biggest culprit in causing the relatively shorter lifespan of the series 5 engines!! He said that in alot of cases, the electric OMP would just stop working and due to the loss of lubrication for the apex seals, the seals would finally give. This makes sense because if you figure that your engine has 100,000 miles or so on it and that it is "relatively worn out" and not as strong as it used to be, that depriving the apex seals of lubrication at this point in the engine's lifespan would certainly result in atleast SOMETHING breaking or wearing out. He mentioned that this is the reason why there are soo few catastrophic failures with the series 4 and earlier engines, and why it is harder to find good used series 5 housings and rotors.
He stated that I should either switch to a series 4 mechanical OMP and "up" the amount of oil that gets injected, or just add premix oil into my gas tank. He said that you can easily get 200,000 miles out of the engine this way.

I believe that this was the demise of the 91 N/A that I got back in October that I just finished rebuilding and I currently have 1,300 miles on the rebuilt engine. The engine had 109,000 miles on it when I got the car, and it was running on 1 rotor. When I disassembled it, I found that 2 apex seals were missing and the 3rd one was in pieces and stuck inside the apex groove of the rotor. Both the front rotor and housing were COMPLETELY TRASHED!!! I will be running premix in my next tank of gas because I wanted a "good break-in" of the engine.

Brian

joel91

last question, i've already searched and some people are using the stock Omp like me but also adding premix for security....Does anyone think it is worth it to add a little extra to the tank for security??? Will it hurt anything by doing both???

Icemark

depends on how much premix you are using... if you are using more than 200:1 with the stock MOP working then, yes there will be probably increased build up on the rotor faces.

joel91

If this is a good idea how many OUNCES per fill up would be good security??? And is there any special two stroke oil to use...i was at walmart today and saw universal two stroke oil for like chainsaws and lawnmowers in an 8 0z bottle for like .99 would this be ok to use???

thanks

joel91

so like 8 ounces should be ok per fill up right??? equating that i have about 15 gallon tank

joel91

i know i said last question earlier but i lied, could someone help me out with the above questions.......thanks

patman

iTrader: (3)

just read the back of the bottle...it has a table for how much to add per gallon.

i use pennzoil TCW3. costs like 6 bucks a gallon at wally world

pat

NZConvertible

There's excellent info on the electronic OMP in the S5 SAE paper, including how it reduces oil consumption by 80%. It explains how Mazda worked out how much internal lubrication was needed by comparing apex seal temperature vs. the amount of oil injection at various revs. The main drawback of the mechanical OMP is that the amount of oil injected increases linearly with revs, but the actual amount required does not, so more oil is injected at lower revs than is really needed.

2Lucky2tha7

iTrader: (3)

I still have my electronic OMP attached and I will be premixing as well. So I'll probably be adding anywhere between 8 - 12 ounces per tankful I guess, considering that my electronic OMP is probably still working.

joel91

yea im going to start premixing as having the stock omp hooked up as well...just for a little added security.....but basically any two stoke oil is ok thats what your adding to the gas tank right??

2Lucky2tha7

iTrader: (3)

I usually go to Walmart and find the Pennzoil TCW-3 rated 2-stroke premix---preferrably smokeless type. I've also found synthetic based 2 stroke premix for only a few dollars more for the gallon size at Advanced Auto here in PA.

patman

iTrader: (3)

i dunno about you guys who are doing both...seems like an awful lot of oil goin thru your engine.... i'd say its best to pick one or the other...

pat

joel91

we are talking about 8 oz to a tank full thats not much....

2Lucky2tha7

iTrader: (3)

^ Exactly.
Plus, I'd rather not have my electric OMP just hanging in the engine bay unbolted from the front cover. I'd rather just add premix.

joel91

Right!!