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Omega General Help / Re: Engine Management Light On
« on: 07 August 2023, 18:28:44 »I'd be surprised if any of the pipes on the back of that breather can cause the EML light to come on. ECU only knows what the various sensors tell it, and AFAIK nothing measures anything in the breathers.It's unmetered air into the intake which potentially causes discrepancies elsewhere, hence the light.
More likely to be an electrical connection off one of the various sensors, actuators or valves that are part of the plenium. The ECU does know if they're unplugged - it basically measures their resistance, and if that resistance is out of limits then EML on. As others say - get the codes read, or do the pedal trick.
No. The big pipes come from the crankcase, which is basically at atmospheric. I've run mine with them disconnected - no issues - although that is/was a 3.0 not a 3.2. The holes in the breather are tiny (assuming they're not actually blocked). The ECU only measures MAF, not MAP, so there is no way for it to know there is a leak except from lambda readings. Lambda sensors won't throw a fault till the engine is warm. So if the EML is on straight from engine start then it won't be from an 'unmetered air leak' IMHO.
When I replaced my engine ISTR there were 3 'faults'. I'd not plugged the EGR or the fuel tank breather solenoid in properly, and it threw the TC's from start-up. My money is on something similar since the Plenium must have been off to do the cam belt. But all should be revealed if we can get Lizze to read the codes