Peugeot 307 SW 2.0 hdi 90 hp 2005 - High fuel consumption faulty EGR

Honest John Back Room » Technical matters
What is life like with your car? Let us know and win £500 in John Lewis vouchers | No thanks
View Threaded
Fri 20 Jan 2012 20:03
Peugeot 307 SW 2.0 hdi 90 hp 2005 - High fuel consumption faulty EGR - Sandstorm

Hi,

Recently my Peugeot 307 SW 2.0 hdi 90 hp, gave a fault indication. Indicating a problem with the exhaust gas. The orange indicator was lit on the dashboard. I noticed that the fuel consumption had increased. I could do approx. 150-180 kilometers less with 1 tank of gasoline. Also the actual fuel consumption on the dashboard was presenting different values. It also takes a while before the boardcomputer calculates an actual fuel consumption especially driving slower than 40 km/h. Below 40 km/h no value is calculated.

Today we checked the EGR valve, the valve is functioning well. The EGR is a vacuum operated sensor. Then we noticed the vacuum was present almost all the time opening the EGR valve. We could not make sure what was causing this issue.

We unpluygged the vacuum hose from the EGR valve and closed them by a stop. After that we removed the fault indication. After a test ride I noticed no difference in the fuel consumption, it was still quit high. Als the fault indication came back and the light of the motormanagement is back on again.

The motor is starting and running OK, but still has a high fuel consumption.

What to do, to find the cause of this problem, please help.

Sorry for my poor English, but I'm a dutch guy.

Reply | Report as offensive | Link
Sat 21 Jan 2012 00:59
Peugeot 307 SW 2.0 hdi 90 hp 2005 - High fuel consumption faulty EGR - unthrottled

I hope you're not putting gasoline into an HD! ;-)

Rather than EGR, is the fault indication saying "anti pollution fault" (or the Dutch equivalent!)?

Some of Peugeot's engines were fitted with FAP particulate traps that needed an Eloys additive to help burn off the soot. The eloys reservoir tends to be depleted after 50,000 miles or so. Without the additiv, the engine would have to use a lot of extra fuel to try to raise the eXhaust gas temps. Could this be the problem?

Reply | Report as offensive | Link
Fri 27 Jan 2012 20:34
Peugeot 307 SW 2.0 hdi 90 hp 2005 - High fuel consumption faulty EGR - Sandstorm

Thank you for your reply. My car was manufatcured by then end of 2004, so no particle filter is present.

Update:

Today I went to an official Peugeot dealer for a software update. The problem might be caused by a shorted circuit a while ago, when I was replacing the rear light and the motor was running idle. Before the software update we noticed that the 'duty cycle' of the EGR-valve was 99.2% in idle mode. After the software update the value slowly drops from 99% to 65%, so there is a difference. But I didn't have had enough time to test if the fuel consumption has been decreased.

Does someone know what the 'duty cycle' of the EGR-valve must be, when running idle with an cold engine? Personally I think that the EGR-valve must be closed completely during a cold start and has a 0% duty cycle.

Can someone confirm that the acutal fuel consumption is not present (showing --) driving slower than 30 km/h (17 mph)?

Reply | Report as offensive | Link