Thread: Fixed me Black smoke and other things

A question to those who have who have put in EGR blanks on their pre 07 2.7s. Most of you have indicated that the EGRs were really carboned up at relatively low km. In your opinion, for us with post 07 engines that cannot have EGR blanks fitted is it worth putting the EGRs on our maintenance schedule to have them decoked at say every 60K or some other suitable interval.

A friend of mine recently had his 130,000km 07 D3 run really bad - no power and running rough - the EGRs had gummed up and had to be replaced - fixed the problem.

Cheers

Garry

Garrycol ,Its not so much that the EGR pipes from the Exhaust up to the Y-piece are gummed up , because they werent , it is the amount of gumming up in the Y-piece downstream of the Butterfly and the coating of the MAP sensor . The gumming up thats a problem on the post 06's (and probably for the pre-06's !)is at the actual control valve down on the exhaust manifold .Its this valve that sticks then throws up an error because it failed to open in a given amount of time /temp/pressure You would have to see the amount of EGR/exhaust particulates to appreciate how much of this crap is going into the combustion process .
The error that is thrown up on post 06 model , does it actually prevent the car from operating properly ,? without going into some escalation process,is it more of a warning than a shutdown circumstance ?? If its only a warning and doesnt escalate , id rather block the EGR and put up with the warning .(as long as it wasnt a audible warning LOL )

Thanks for that - I am not sure of the exact reason (yes a fault is thrown up) but all the forums simply state that EGR blanks must not be fitted to 07MY on engines. Have asked on the UK site if there is a system under development and there was a resounding NO.

Garry

The whole EGR thing is an interesting debate ,whilst primarily its Pollution (Nox) minimising arangement ,it has its advantages on Spark/petrol engines but for CI Deisel engines its debatable .
By feeding the lower oxygen exhaust gas into the intake, diesel EGR systems lower combustion temperature, reducing emissions of nitrous oxides. This makes combustion less efficient, compromising economy and power. Diesel EGR also increases soot production, though this was mitigated in the US by the simultaneous introduction of [ame="http://en.wikipedia.org/wiki/Diesel_particulate_filters"]Diesel particulate filter - Wikipedia, the free encyclopedia@@AMEPARAM@@/wiki/File:FAP-Filter_Peugeot.jpg" class="image"><img alt="" src="http://upload.wikimedia.org/wikipedia/commons/thumb/5/57/FAP-Filter_Peugeot.jpg/220px-FAP-Filter_Peugeot.jpg"@@AMEPARAM@@commons/thumb/5/57/FAP-Filter_Peugeot.jpg/220px-FAP-Filter_Peugeot.jpg[/ame].[5] EGR systems can also add abrasive contaminants and increase engine oil acidity, which in turn can reduce engine longevity.[6]
It is this last statement that is the main reason to fit the the Block-off kit !

Originally Posted by 400HPONGAS

The error that is thrown up on post 06 model , does it actually prevent the car from operating properly ,? without going into some escalation process,is it more of a warning than a shutdown circumstance ?

LR's documentation for the warning light introduced with the 2007 model stated that it was provided so that the driver could be informed of a failed EGR valve so that it could be fixed rather than not know of the problem and therefore not get it fixed. Whilst its not conclusive, the implication was that it was a warning only. UK vehicles will fail their MOT (rego) test if the light is on so blanking a faulty egr valve is not an option. However if blanked at the inlet port (rather than the usual outlet port) whilst the valve is still working, the exhaust gasses cannot foul the valve so it will probably keep working forever.

My mates post 07MY EGRs failed and he never got a a dash indication just poor power under load (like when trying to back a horse float).

EGRs were completely blocked - when replaced the car's performance was back to normal.

Garry

The hard part for me is understanding/finding out exactly what condition is not met and how it is detected that actually throws the EGR CEL . Its probably some polling of the actuator return voltages/resistances , whatever , that some inbedded logic says is out of acceptable range . without knowing that its pretty hard to work out how to bypass it , the warning that is , and still disconnect the EGR from the inlet tract.

Originally Posted by garrycol

My mates post 07MY EGRs failed and he never got a a dash indication just poor power under load (like when trying to back a horse float).

EGRs were completely blocked - when replaced the car's performance was back to normal.

Garry

My understanding is that the MY07 update changes were introduced part-way through MY07 production rather than at the commencement, so some MY07s would be the same as MY06.