D5 (D5244T to 2005) URGENT! EGR valve replacement

[TylerWatts]

Hi Mike
Yes, fitted it yesterday after again having mine go a while absolutely fine then flattly refusing to work... It seemed to be going fine, apart from smoking like a pig.

What would cause alot of smoking under acceleration? And I know it is over-fuelling, therefore what causes that? Woudl an out of calibration MAF be the only culprit or what else (with the onslaught of age and high mileade, 177k) might be adding to the smoking please?

Thanks
Tyler

[TylerWatts]

PS, I hate EGRs! Pointless complications in our engine's operation! Anyone know fi the ECU can be remapped/tweaked to eliminate the EGR parameter? Is that difficult due to the link between everything on the engine to fuelling, timing etc?

[richard willetts]

Do they run any better wihtout the EGr, is there a benefit in removing them?

[rnlisg]

there was a lot of posts on the jaguar x-type forum ref this,it seems the way they went was to drill a small hole(i think it was 6mm) in the center of the blanking plate,this fools the maf unit into thinking its still fitted and working,from the amount of posts and pictures etc on this it seemed to work well with no lights coming up and no issues with performance.
cheers
sandy

[TylerWatts]

Thanks Sandy, that's an interesting idea.

Richard, as you know, Diesels are lean burn engines, controlling power output purely by the amount of fuel added (on a simplistic level). When the EGR engages, it lets in Exhaust gas off-setting the intake air oxygen, and leans the burn leaving the exhaust which is supposed to burn extra oxygen in the exhaust gas to convert CO (carnom monoxide, very poisonous) into CO2 (carbon dioxide, 70% of the earth's atmosphere). This is only effective to a small degree, and costs more in unburnt fuel (when all the oxygen is gone, no fuel burns) and crud in teh exhaust system (and smoke) than it really benefits, plus it reduces power (torque predominantly, as it operates at low rpm) which means more throttle for the same output of work, ergo greater fuel consumption.

Similar effects occur in Petrols, except it is around maintaining the air-fuel ratio, rather than the throttling required at the time.

From having the EGV blanked, it was great until the ECU wised up and wasn't happy about it. Now the ECU is happy everything's working again it has cheered up, but consumption has dipped (accoring to economy gauge) and smoking is back in force (wasted fuel)! So if we could tell teh ECU to remove it's EGR parameters we'd be laughing! Unfortunately the amount of fuel we use because of EGV profits oil companies too much and EGR is embedded in every combustion engine on earth pretty much!

[rnlisg]

hi tyler&richard
there was also a huge discussion on the discovery 3 forum.the 2.7tdv6 engine has 2 of the buggers,they are very awkward to get at and main stealers want £7-800 to replace them.on the engines up to 2007(eu3)they could be easily blanked,with kits readily available £30-£50,there were no issues with warning lights etc,economy and overall running was better and no problems with mot,s.the eu4 engine 2007 on,although much the same could not be blanked without lighting up the dash big time,the problem was electrics one of the site sponsors was working on a plug in unit to fool the system into thinking egr,s were still connected(i think he is still on to it).
cheers
sandy