I'm kinda sad to see that you've sorted the problem. I'm gonna miss the regular updates you've shared and the advice so many have given. I've had a funny misfire that comes any goes, most noticeably during the hotter days of summer, with the AC running. I think I'm gonna order a crank sensor and see if my issue will disappear...
Great to hear your back on the road. Cheers!! :beer
When my R53 went into limp mode a couple years ago, I had a bad MAP sensor. As I remember there are two sensors. If you can get a code reader it'll help to pinpoint for a better diagnosis.
Thanks for the good wishes. 2004 MC ....The Mini is home thanks for Visa and flat bed truck....there went $400! was an expensive weekend..LOL more on that later.
I completely drained the tank and replaced the pump. Strange thing is I get the fault , check while the engine is running which cylinder is bad by pulling the plug wire. First is #4, stop the engine, switch on and the cylinder is now #2, repeat and I get #3 repeat #4 repeat #3 repeat #2 never seams to be #1 but I didn't test that many times. I'm going to test the fuel pressure tomorrow as I tired of the Mini today...haha
Could the 02 sensor be the problem? I think the issue is fuel related as the wideband gauge goes lean. I'm guessing the bad fuel could have damaged the sensor?
Things it could be:
Upstream O2 sensor, MAP sensors, crank position sensor, cam position sensor....
You can swap the upstream and downstream O2 and see if that changes anything.
Can you test fuel pressure with a gauge?
Sounds like a fuel starvation problem...
Fuel pressure regulator? clogged fuel system somewhere? Is the vacuum hose attached to the fuel pressure regulator? (check both ends)
I have a fuel pressure gauge so I'll start with that tonight. I pulled the regulator off and cleaned the little filter and the line looks fine. I did check for leaks. the strange thing is when I drained the tank using the fuel pump I saw a lot of crap come out into the container which should not be the case because the filter should catch that.
The problem I see is swapping parts is going to be very expensive. The 02 sensor is $200 from eminiparts. I believe the up stream 02 sensor is the original one so maybe it's faulty? but reading online the idle would be affected which is not the case. What I can't figure out is it remains on 3 cylinders at idle and goes back to 4 after I restart the engine. the problem only happens I hold at rev's. like 1500, 2000 , 2500 etc if I blip the throttle up and down it does not happen........also I have emailed Total USA and CR so maybe they will pay?? LOL
Yes I just filled up with gas and replaced the Vee belt. So I thought I'd knocked a pipe off while changing the Vee belt. Nothing was amiss. Regarding the grounds. I've had this problem before when the SES light came on because a tyre in the back move a ground, so I took off every ground I could find. cleaned them and refitted.
Here's the latest from last night. Fuel pressure is around 52psi and does not change when the fault develops. Now here's the strange thing. The engine runs fine from 4000rpm and up. wideband reads a constant 14.7 to 15.3 mixture. I held the revs at 4000rpm for about 10 minutes. no miss fire. so the pressure, injectors, sparks, pump must be good.
If I drop the revs the problem starts bang on 3500rpm. so from 1500 to 3500 the problem will happen. I pulled the plug off the up stream 02 sensor and ran the engine. apart from running a little richer 13.4 the same rev range applied. problem 1500 to 3500 nothing after 4000rpm.
So I thinking something controls the mixture from 1000 to 35000 and then something else from 4000 upwards. The up stream is the original 02 sensor and the down stream an internet version.
The wideband gauge is worth the money to take out the guess work.
Tonight I'll swap the 02 sensors as suggested because I think the issue is some mixture related based on the crappy gas. How about the throttle pedal? could there be something wrong there? Also I have a spare MAP sensor some place.
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