Quote:
Originally Posted by gjkrv8
Thanks ICETOO - I drove about 90 ks today from Melb to Rye. I have turned off the power to the ECU for a while in case it fired up in a weird mode. I am also going to have a look at the MAf to make sure its clean as I read something about that. Also Can you disconnect O2s and run in Open loop mode to see if the O2s are giving false readings?
Thanks
rgds
Gregg
|
Still reckon the ECU may need a good run to relearn. Sometime when the independent power supply to the EPROM in the ECU jags in the tuning map and codes can be lost. Do you have you original tune loaded into your dash controller unit or hand controller unit what ever the case as you can reload the tune and go from their.
We are assuming here that you have done checks for uptake restriction and vacuum leaks at the intake. This will normally show as a MIL error from the MAF datum series of P codes.
If you do have a dash unit or and OBDII interface with a PC or I pad, you can assign a driver to the O2 sensor in the analogue drivers menu (of most tuning suites and controllers) to ascertain what lambda signal value is being read by the ECU...this will directly influence injection metering, timing ans the fuel intermix ratio.
You can also a sign a driver to the secondary O2 sensor downstream of the catalytic converts if fitted....and compare the two values. I think running the O2 sensor in open circuit will not give any real data as the ECU will have to run of the secondary if fitted with the primary bypassed...but may also help narrow down the gremlin...but I would expect if there was no secondary the ECU will become even more confused.
Another thing to check is fouling of the Manifold absolute pressure and temperature (MAPT) sensor. These pick up junk from either PCV or EGR recirc systems when the engine cools and the condensate forms a sludge that will effect the voltage potential on the sensor and thus send incorrect data to the ECU to manage....and poo data in equals poo direction out.
Worth a quick pull, look and tizzy up with some electrical contact cleaner.
Lets us know how you go mate..Ads!