Burning Oil, Lambda Sensors and MOT Time
Discussion
My 2001 4.0 Tuscan (now with just over 56k on its original engine without any rebuilds) passed its MOT last year with a few issues on the emissions test. It took the tester and myself a few goes to get it through. Having read various threads on here, I'm fairly sure I have worn valve guides (blue smoke on start up, using over 1 ltr per 100 miles etc).
My question is: If I'm burning excessive oil when running, will this (seriously) affect my emissions test results or have I potentially got problems with my Lambda sensors?
My last MOT emissions results were:
The strange thing (to me anyway) is that the CO is high at revs, but fine when at Idle. Does this therefore suggest something else?
My question is: If I'm burning excessive oil when running, will this (seriously) affect my emissions test results or have I potentially got problems with my Lambda sensors?
My last MOT emissions results were:
| Value | Limits | Actual |
|---|---|---|
| Engine Speed | 2500-3000rpm | 2500 |
| CO | <=0.300% | 0.251% |
| HC | <=200ppm | 13ppm |
| lambda | 0.970-1.030 | 1.024 |
| Engine Speed | 450-1500rpm | 900 |
| CO | <=0.500% | 0.014% |
The strange thing (to me anyway) is that the CO is high at revs, but fine when at Idle. Does this therefore suggest something else?
Edited by S6PNJ on Saturday 4th September 13:49
Excesive smoke it will fail,and will block your cats if you still have them fitted, also by what your saying you have got some serious wear on the valve guides, the oil will increase chances of detonation pinking as fuel is contaminated by the oil, you can check the rings by driving the car under load then shut the throttle look out of the rear view mirror if there is smoke on the overun it could also be piston rings aswell sorry to be the bearer of bad tidings.
dpd3047 said:
Excesive smoke it will fail,and will block your cats if you still have them fitted, also by what your saying you have got some serious wear on the valve guides, the oil will increase chances of detonation pinking as fuel is contaminated by the oil, you can check the rings by driving the car under load then shut the throttle look out of the rear view mirror if there is smoke on the overun it could also be piston rings aswell sorry to be the bearer of bad tidings.
I wouldn't say it has got excessive smoke - a bit but not much. Yes my cats are still fitted but as I've managed less than 2k miles in the last 12 months, I'm probably not putting much oil through them. I do get some pinking at med-high revs under hard acceleration and sometimes see the puff on the over-run. The fact that I'm approaching a rebuild does not worry me (within reason as I've expected one over the last 5 years), I'm just after advice as to what I can check (easily) and whether it is likely to pass the MOT.Assuming this works, below are the latest 3 files from my ECU
Fuel injector map bank 123 http://freespace.virgin.net/pnp.cooke/0509123.MAP
Fuel injector map bank 456 http://freespace.virgin.net/pnp.cooke/0509456.MAP
Real Time Log file from a quick drive after having reset the map files http://freespace.virgin.net/pnp.cooke/20100905.RTL
The RTL file has a few 'hard' accelerations in it as I wanted to check the Lambdas were switching off so there might seem like some erratic driving going on (assuming you can interpret the wiggly lines!)
Does any of the above say anything to anyone?
What I've noticed is that the throttle values are out and the adaptives sometimes go in opposite ways (if my memory serves me correctly - last looked at the RTL 2 days ago)
Fuel injector map bank 123 http://freespace.virgin.net/pnp.cooke/0509123.MAP
Fuel injector map bank 456 http://freespace.virgin.net/pnp.cooke/0509456.MAP
Real Time Log file from a quick drive after having reset the map files http://freespace.virgin.net/pnp.cooke/20100905.RTL
The RTL file has a few 'hard' accelerations in it as I wanted to check the Lambdas were switching off so there might seem like some erratic driving going on (assuming you can interpret the wiggly lines!)
Does any of the above say anything to anyone?
What I've noticed is that the throttle values are out and the adaptives sometimes go in opposite ways (if my memory serves me correctly - last looked at the RTL 2 days ago)
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