had my 2.5 plugged in and following codes show.....P0340........P0401......P1130.....P1131....WOULD THIS BE RELATED TO A DUFF IMRC???? many thanks.
Will try to erase codes over the next few days and see if they re appear.picked up a replacement IMRC today,if Ijust unplug the imrc what would that cause ? ie loss of power,no difference,or lumpy running.
I've heard variously that forcing the secondaries open, which you can do with a piece of wire, causes a corresponding loss of low end torque, lumpy idle and increased fuel consumption.
Lumpy running I have experienced myself, but maybe I should reset my ECU so that it can relearn how to deal with this. You can of course expect appropriate DTCs if you disconnect the IMRC...
Honestly, you won't have heard that here because it's 2/3rds wrong. Okay, you will lose (very) low-end torque - that's a given. But:
1) The idle is completely unaffected. Secondaries open or not, the only air the engine is getting is through the IACV. If the ECU doesn't like what the engine is doing, it'll adjust that valve to suit since the throttle butterfly is closed. Mine happily sits at around 940 or so and is as smooth as a buttered otter. Paul's is the same.
2) No, decreased fuel consumption in driving regimes that would normally involve the IMRC being closed. She's inhaling more air than the engine is demanding, but the ECU doesn't seem to increase the fuelling to compensate, (we'd need to know the ECU's programming to understand why, and that's never gonna happen). She will run lean and slightly hotter, which is - to a point - good for efficiency. We have data that proves this but you'd better make sure your cooling system is up to scratch.
Yes and yes, mate. Battery off, ECU adaptation reset, then reconnect and do the standard "learning" drive.