EGR disabling and Fault registring

grivas · 14th May 2008, 21:26

Hi,

I am curious as to whether the ECU registers and stores a fault code, if the EGR valve is disabled or if it is replaced by a bypass tube, does any one know.
If so, does the ECU set the MAF signal into a default mode that will then limit or at least reduce the power output of the engine somehow.
Finally does Testbook be used to check?.

pondweed · 15th May 2008, 06:55

I beleive it does register a code but doesnt raise the engine light. Unlike my Siemens HDi which raises engine light when either plug OR a vacuum pipe is disconnected...grrrr)

Bazman · 15th May 2008, 16:04

I fitted an EGR Bypass a few months ago and no faults have come up on T4 since.

Barry.

GERFIX · 15th May 2008, 17:26

I disabled my EGR Valve a few months ago. I since fitted Ron's Synergy 2 and PB MAF. There is talk on the other site of the EGR bypas/disalbing causing the car's computer to reduce the power due to incorrect running. If that's the case then it is something I have not yet experienced. I have felt no detrimental effects since disabling my EGR.

Keith · 15th May 2008, 20:33

I have seen "airflow too high" a couple of times on my T4
once due to a faulty mafam and once cause unknown but I have not worked on enough cars with the bypass to draw any conclusions

I am hoping Rob on org will quantify his comments about the ecu behaviour.

If there is any chance of that happening I will be going back to standard EGR as I realy have not noticed any improvement with the bypass fitted

GERFIX · 16th May 2008, 09:11

Quote:

Originally Posted by Keith

I have seen "airflow too high" a couple of times on my T4
once due to a faulty mafam and once cause unknown but I have not worked on enough cars with the bypass to draw any conclusions

I am hoping Rob on org will quantify his comments about the ecu behaviour.

If there is any chance of that happening I will be going back to standard EGR as I realy have not noticed any improvement with the bypass fitted

I was just about to work on a DIY bypass but as it would mean demolishing the valve with various grinders and cutters, I am now a bit dubious as to whether I should or not at least until there is some concrete evidence available.

Zeb · 16th May 2008, 13:26

Hmmm....put it like this. After roughly 15000 miles with the EGR bypass I have had no problems....equally, anyone who has been in my 75 will testify that 'reduced power' is an alien phrase to dear old Emily...sooner or later I will get her on a T4 and I will let you know...

Keith · 16th May 2008, 17:37

I must admit I am driving an auto with one fitted and by comparison to my saloon is pretty slow so the EGR bypass may be doing something!

Zeb · 19th May 2008, 08:16

Just been looking at the threads regarding ecu and egr...I just can't see it as there are no sensors in the egr saying if the egr is operating or otherwise...at the very least, it is one less thing to get clogged up and have to clean...

black olive · 19th May 2008, 12:33

Id blanked off the egr vacuum tube on moodyblue, and when the RAC had an OBD reader plugged into the car it was registerind an EGR related fault code

14th May 2008, 21:26	#1
grivas I really should get out more....... Rover 75 CDT Club Tourer Join Date: Nov 2006 Location: Milky Way Posts: 2,381 Thanks: 105 Thanked 513 Times in 382 Posts	EGR disabling and Fault registring Hi, I am curious as to whether the ECU registers and stores a fault code, if the EGR valve is disabled or if it is replaced by a bypass tube, does any one know. If so, does the ECU set the MAF signal into a default mode that will then limit or at least reduce the power output of the engine somehow. Finally does Testbook be used to check?.

15th May 2008, 16:04	#3
Bazman Avid contributor Rover 75 2.0 cdt connoisseur SE tourer Automatic Join Date: Jan 2008 Location: Retford Posts: 106 Thanks: 0 Thanked 0 Times in 0 Posts	EGR Bypass I fitted an EGR Bypass a few months ago and no faults have come up on T4 since. Barry.

15th May 2008, 17:26	#4
GERFIX I really should get out more....... MINI COOPER S Join Date: Nov 2007 Location: Tranent, East Lothian, SCOTLAND Posts: 2,834 Thanks: 0 Thanked 0 Times in 0 Posts	I disabled my EGR Valve a few months ago. I since fitted Ron's Synergy 2 and PB MAF. There is talk on the other site of the EGR bypas/disalbing causing the car's computer to reduce the power due to incorrect running. If that's the case then it is something I have not yet experienced. I have felt no detrimental effects since disabling my EGR. __________________ .......................................Colin http://i245.photobucket.com/albums/g...Cooper-S-2.jpg

19th May 2008, 12:33	#10
black olive I really should get out more....... 260 SE vin 214 ( last mark 1 260 ) Join Date: Dec 2006 Location: Lancashire Posts: 2,009 Thanks: 1 Thanked 8 Times in 4 Posts	Id blanked off the egr vacuum tube on moodyblue, and when the RAC had an OBD reader plugged into the car it was registerind an EGR related fault code __________________ [SIGPIC][/SIGPIC]

15th May 2008, 06:55	#2
pondweed This is my second home Waiter, Waiter! I seem to have a Roomster in my drive... Join Date: Nov 2006 Location: Sussex Posts: 3,268 Thanks: 0 Thanked 1 Time in 1 Post	I beleive it does register a code but doesnt raise the engine light. Unlike my Siemens HDi which raises engine light when either plug OR a vacuum pipe is disconnected...grrrr)

15th May 2008, 20:33	#5
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	I have seen "airflow too high" a couple of times on my T4 once due to a faulty mafam and once cause unknown but I have not worked on enough cars with the bypass to draw any conclusions I am hoping Rob on org will quantify his comments about the ecu behaviour. If there is any chance of that happening I will be going back to standard EGR as I realy have not noticed any improvement with the bypass fitted

16th May 2008, 13:26	#7
Zeb Banned MGZT V8 & ZTT 190+LPG Join Date: Nov 2006 Posts: 8,089 Thanks: 0 Thanked 0 Times in 0 Posts	Hmmm....put it like this. After roughly 15000 miles with the EGR bypass I have had no problems....equally, anyone who has been in my 75 will testify that 'reduced power' is an alien phrase to dear old Emily...sooner or later I will get her on a T4 and I will let you know...

16th May 2008, 17:37	#8
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	I must admit I am driving an auto with one fitted and by comparison to my saloon is pretty slow so the EGR bypass may be doing something!

19th May 2008, 08:16	#9
Zeb Banned MGZT V8 & ZTT 190+LPG Join Date: Nov 2006 Posts: 8,089 Thanks: 0 Thanked 0 Times in 0 Posts	Just been looking at the threads regarding ecu and egr...I just can't see it as there are no sensors in the egr saying if the egr is operating or otherwise...at the very least, it is one less thing to get clogged up and have to clean...