Freelander 1 TD4 BLACK SMOKE WITH NO LOSS OF POWER

wammers · Jan 23, 2016

Nodge68 said:
First there was this ^^^^.
This is inaccurate information. This is what I was referring to.

You have just said exactly what I was saying. The ECU references the MAF signal for fueling.
There's no need for Wammers to give the remedial explication on how a diesel, in general works.
What I'm saying correct. The BMW MR47 ECU uses the MAF signal to calculate correct fueling.
If the MAF signal is incorrect, the fueling will also be incorrect.

You don't have a clue what you are talking about. Fuel is injected subject to throttle position request and power required. Nothing to do with the MAF. The MAF is there to measure the amount of exhaust gas entering the engine when EGR is active. For any given power request throttle opening manifold pressure there is ALWAYS the same amount of combustible air in the cylinders other than subject to EGR being active. Fuel does not change.

hd3 · Jan 23, 2016

" Zero maf signal from a dead maf (but not open circuit) will under fuel the engine to such an extent that it will NOT START. If you don't believe me, remove the maf from its housing, reconnect it and try to start the engine...No airflow = no maf signal = no fuel. "
( http://tuning-diesels.com/75Zt/R75maf.htm )

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wammers · Jan 23, 2016

hd3 said:
" Zero maf signal from a dead maf (but not open circuit) will under fuel the engine to such an extent that it will NOT START. If you don't believe me, remove the maf from its housing, reconnect it and try to start the engine...No airflow = no maf signal = no fuel. "
( http://tuning-diesels.com/75Zt/R75maf.htm )

************************************************************

So are you saying that if the MAF is disconnected on a TD4 the engine won't run?

Nodge68 · Jan 23, 2016

hd3 said:
" Zero maf signal from a dead maf (but not open circuit) will under fuel the engine to such an extent that it will NOT START. If you don't believe me, remove the maf from its housing, reconnect it and try to start the engine...No airflow = no maf signal = no fuel. "
( http://tuning-diesels.com/75Zt/R75maf.htm )

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Thank god. Someone who knows what they are taking about.
RR (linked) knows what he's talking about. Or is he wrong too.

Nodge68 · Jan 23, 2016

wammers said:
So are you saying that if the MAF is disconnected on a TD4 the engine won't run?

HD3 clearly said remove the MAF from the air flow. Not disconnect it.
Read the link for enlightenment on the effects the MAF has on running and performance.

wammers · Jan 23, 2016

Nodge68 said:
HD3 clearly said remove the MAF from the air flow. Not disconnect it.
Read the link for enlightenment on the effects the MAF has on running and performance.

You really don't have a clue. Perhaps you can explain how the MAF controls fuel when there is always more air in the cylinders than is needed. Anyway carry on no skin off my nose. MAFs on diesels don't work in the same way as they do on petrol engines you seem to think they do.

wammers · Jan 24, 2016

Nodge68 said:
Thank god. Someone who knows what they are taking about.
RR (linked) knows what he's talking about. Or is he wrong too.

In some of his statements yes he is.

Nodge68 · Jan 24, 2016

wammers said:
In some of his statements yes he is.

Ok wammers you win. Nobody knows as much as you, you cock.
You answer all the questions in future cos I ain't gonna.
I'm out of here.

wammers · Jan 24, 2016

Nodge68 said:
Ok wammers you win. Nobody knows as much as you, you cock.
You answer all the questions in future cos I ain't gonna.
I'm out of here.

No need for personal abuse. There maybe some who know more, it's just that you are not one of them.

dfossil · Jan 24, 2016

So if the EGR is removed is the MAF totally redundant on a TD4?

wammers · Jan 24, 2016

dfossil said:
So if the EGR is removed is the MAF totally redundant on a TD4?

No. Not having it connected will confuse the ECU.

dfossil · Jan 24, 2016

OK - so if the MAF is still connected but the EGR is bypassed - is it then sending any info to the ECU - is it affecting the fueling? - would Nodge68 's test of "Unplugging the MAF is a good test. If power is lost, the MAF is likely over reading. If power increases, the MAF isn't retuning a strong enough signal." Still hold good

wammers · Jan 24, 2016

dfossil said:
OK - so if the MAF is still connected but the EGR is bypassed - is it then sending any info to the ECU - is it affecting the fueling? - would Nodge68 's test of "Unplugging the MAF is a good test. If power is lost, the MAF is likely over reading. If power increases, the MAF isn't retuning a strong enough signal." Still hold good

The MAF measures the amount of Exhaust gas being ingested when EGR is active so that the ECU can modulate the EGR valve to maintain a combustible air/exhaust gas mixture. The fuelling for the requested throttle position, power request, manifold pressure is not changed. The fall in the airflow through the MAF when EGR is active tells the ECU how much exhaust gas in being ingested. The fuelling is not changed. If there was to much exhaust gas for the power level set the engine would smoke to little it will produce NOX. The MAF DOES NOT control fuelling subject to airflow through it. As it does on a petrol engine. How hard is that to understand.

dfossil · Jan 24, 2016

a) my question was about when the EGR is bypassed - you did not address that
b) there is no need for "how hard is that to understand"
Good afternoon

wammers · Jan 24, 2016

dfossil said:
a) my question was about when the EGR is bypassed - you did not address that
b) there is no need for "how hard is that to understand"
Good afternoon

You do seem to have problems understanding a simple principal. Diesels are throttled by fuel NOT by air.

NoDosh · Jan 24, 2016

Wammers, you are utterly full of ****. Can you **** off back to the Tratter forum for a bit of a reach-around and post coital glow and leave the Freelander section alone?

It's a simple principle. Even you should get it.

Turboman · Jan 24, 2016

NoDosh said:
Wammers, you are utterly full of ****. Can you **** off back to the Tratter forum for a bit of a reach-around and post coital glow and leave the Freelander section alone?

It's a simple principle. Even you should get it.

None of that sort of thing in the Tratter section!

We are wholesome red-blooded types!

Wammers int one of we in any case, he is an inmate of the pimpwagon forum!

javars · Jan 24, 2016

Well that got out of hand.
Still hoping for a coherent answer to my problem.

wammers · Jan 24, 2016

javars said:
Well that got out of hand.
Still hoping for a coherent answer to my problem.

Good diagnostics may tell you something. If the ECU has been played with it's anybodies guess. Black smoke is overfuelling. Could be caused by to much fuel or lack of air. Or a combination of both.

wammers · Jan 24, 2016

NoDosh said:
Wammers, you are utterly full of ****. Can you **** off back to the Tratter forum for a bit of a reach-around and post coital glow and leave the Freelander section alone?

It's a simple principle. Even you should get it.

Obviously someone else who knows nothing, well done for proving it.

Freelander 1 TD4 BLACK SMOKE WITH NO LOSS OF POWER

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