Just curious... on an s5, if the OMP goes bad, it trips an ecu code, right? limp mode?

Are there any circumstances where the OMP may be not functioning, yet not trip the ECU codes?


Reason I'm asking is based on the reply, i think i will run some premix as a precaution (like 200:1), just in case.

I'm down to the first hash mark beside the "LOW" on the oil dipstick, and I THINK i started off with "FULL" @ oil change about 1500 miles ago. (1 gallon jug of oil)

 

ive never seen one that was bad that didnt trip a code

mike

 

That's good to hear. On a side note, could the OMP be injecting too little or too much oil without tripping a code?

 

Yes. Just because the stepper motor is working doesn't mean it's pumping or something isn't clogged. It might be VERY rare but it could happen.

Chris

 

(i was gonna start a thread about it.. but..)

with all this in mind, how does one inspect the MOP functionality and efficiency? and repair?

 

Yes, in theory the MOP could be bad but not tripping a code. If the actual piston pump inside has failed (not likely) then it wouldn't trip a code. Other circumstances could be that the oil lines are plugged or broken, or the oil dribblers (injectors) could be clogged (very common).

There is a test procedure in the Haynes manual for both the metering oil pump, and the oil dribblers.

 

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