Ummm...I guess I failed to mention that smoking a cigar for the uninitiated WILL make you see things differently, too [or have you spending some time "praying to St. John". :arf:
Started this morning in positive mood, swapped the harness and crank sensor then fitted the ECU etc. went for a start and eventually the engine fired up hoooooo wooooooo! Went for the 3000rpm all seemed well for a few minutes then the issue was back. At this point I switched the engine and walked away. About 2 hours later I decided to go through the Bentley manual to see if I'm missing something, I read the Tmap controlled the ignition and mixture. I had replaced the Tmap so I pulled the plug, started the engine then at 3000 no issues. Yes folks you heard correct. No issues A little shocked I put the old sensor on with issue returning, no sensor , no issues. So I'm thinking the harness may had an issue and buggered up both of the sensors? Anyway the Tmap seems to be the issue. Anyone run without this sensor?
Congratulations on zeroing in on the problem, I like a good mystery as much as the next guy but man, you do deserve a happy ending. Could it be obstructed airflow?
So without the TMAP the car is going to run with a "static" "best guess" map on the ECU. With the TMAP, the car is going to run in it's "normal" mode and trust what the TMAP tells it. So possible culprits are ANYTHING in the TMAP functional or electrical path (obstructed airflow to TMAP, multiple bad TMAPs (possible but not likely), multiple bad harnesses (possible but not likely), bad connection on the ECU, bad internal ECU circuit path for the TMAP. HOWEVER... since the car "knows the difference" between when you do the don't have the TMAP connected, I suspect the harness and ECU circuitry is good. Otherwise the problem would likely persist with the TMAP disconnected. It's POSSIBLY a tuning issue... I suspect the ECU is using some portion of maps when the ECU is connected that it bypasses when the ECU isn't detected. Very odd issue you have here...
It's possible the other Tmap is bad because the ECU was checked twice on an R50 so today I'm going to do the Bentley electrical tests and check for leaks.
Did you say you replaced the Tmap? Even if you did it I would not rule it out completely. I can't tell you how mini times a new part was bad when I installed it.
Here's the electrical results. 27/2 and ground should be 3.9 V is 4.85 V ignition on engine off 31/4 and ground should be 4.0 V is zero ignition on engine off 31/4 and ground should be 1.25 V is 0.02 V at idle. So it looks like the MAP signal has no voltage. either at the ECU plug or Tmap plug. I figure based on this the Tmap sensor is good and the ECU because the ECU ran perfect on the other R50. Now I need to find out why there is no 4.0V map signal. Getting closer!
Oh I forgot. 51 and ground should be 5 volts approx. is 4.89 V this is the reference voltage so looking at the Tmap diagram I think the reference voltage is the supply to the Tmap signal because the voltage changes for the map signal under pressure. So maybe the both sensors are bad? I'm going to get another sensor. Also I'm going to ask the ECU guys to do a electrical test with plug on and off.
Done a bit of online reading as it's raining buckets. One Mini owner had multiple Tmaps replaced finding out he was over oiling his K+N filter. Another owner replaced the engine harness and fixed the problem. So I'm going to buy another Tmap and see want happens.
Tmap sensor is not available from Mini CR,a 1 month wait, the local used Mini parts want $75 for a used one. Or Eminiparts to the rescue for the same price new plus shipping. Lucky for me an engineer is coming to CR on Wednesday......so this could be the day! The day Mini is back!
One thing that concerns me is I have 3 Tmap sensors. 2 used and 1 new. All of them test the same which is strange but I suppose 3 of them could be bad. I hope the new one has Eminiparts luck with it. I wore my Eminiparts cap while fixing the Mini over the weekend and found the Tmap sensor issue so maybe the cap is lucky? LOL.
I really hope that this will be the fix. No one should have to go through this many ups and downs to repair a problem.
I hope so but another down! The engineer dropped the ball and did not bring the sensor even though the sensor was delivered! aaaaaarrrrrrrgggggggghhhhhhhhh now I have wait until another engineer is coming down. Oh the torture.
Some perfect universe timing for sure! Found another engineer coming down to CR on Monday so I hope the sensor will be in my paws on Tuesday. Another weekend to pass by in the pub! LOL
I'm going to use the time to fix the exhaust rattle and clean/polish off all the bird crap and spider webs. 4 months of sitting in the weather have taken their toll.