justanewbie
11-12-2012, 01:35 PM
Hi All,
I had to do the infamous chain guides on my car and a friend offered to do this whilst I was working away. He did it all, except he did not use the proper timing tools to re-time the engine.
Anyway, since then, I have re-timed the engine several times, the last time with the assistance of a BMW specialist (using the appropriate tools).
It is now smooth as silk, however, still running rich by way of observing the fuel trims.
From a cold start it goes from 0 to -15 on the Short Term Fuel Trims. The Long Term Fuel Trim is about -13 on bank 1 and -14 on bank 2... not enough to trigger the Engine Management Light but still not great.
Other bits I have done/replaced are:
- replaced 2 front oxygen sensors with new Bosch ones.
- tried another MAF.
- replaced intake manifold gaskets
- replaced vent pipe under intake manifold
- replaced rear crank case vent valve
- replaced fuel filter with regulator.
- replaced the valley pan.
- swapped over injectors from a M62TU 740i facelift.
Looking at the rear o2 sensors, I believe they should be fairly static at 0.45v... I have also tried swapping these for another working set. Could the fluctuating voltage of these be pointing me to a CAT problem?
Any help would be really appreciated!
I had to do the infamous chain guides on my car and a friend offered to do this whilst I was working away. He did it all, except he did not use the proper timing tools to re-time the engine.
Anyway, since then, I have re-timed the engine several times, the last time with the assistance of a BMW specialist (using the appropriate tools).
It is now smooth as silk, however, still running rich by way of observing the fuel trims.
From a cold start it goes from 0 to -15 on the Short Term Fuel Trims. The Long Term Fuel Trim is about -13 on bank 1 and -14 on bank 2... not enough to trigger the Engine Management Light but still not great.
Other bits I have done/replaced are:
- replaced 2 front oxygen sensors with new Bosch ones.
- tried another MAF.
- replaced intake manifold gaskets
- replaced vent pipe under intake manifold
- replaced rear crank case vent valve
- replaced fuel filter with regulator.
- replaced the valley pan.
- swapped over injectors from a M62TU 740i facelift.
Looking at the rear o2 sensors, I believe they should be fairly static at 0.45v... I have also tried swapping these for another working set. Could the fluctuating voltage of these be pointing me to a CAT problem?
Any help would be really appreciated!