The 75 and ZT Owners Club Forums - View Single Post - More on the EGR Bypass Valve....Modify or Leave alone

Jules · 3rd December 2007, 13:04

Just been reading an article on Honest John an excellent review Website:
http://www.honestjohn.co.uk/carbycar/
See also
http://www.honestjohn.co.uk/carbycar/index.htm?md=121&

This is admittedly about a Ford Galaxy 1.9Tdi, but I wonder if this would apply to 75 ZT owners who have disabled their EGR or fitted a bypass.

The consequences can be dire...............read on

"On TDIs, EGR valve should open to allow carbon dioxide, which acts as a cooling gas) into the combustion chambers when the engine is under load (>30% boost). This allows the combustion chamber temperature to drop and thus the temperature of the exhaust gases. If it sticks in the closed position the exhaust gas temperature will rise causing a) the turbo bearings to fail and b) engine oil into the induction system. This can cause the engine to run on its crankcase oil until it is either stalled or goes bang. Problems with EGR valves in TDI engines are often the cause of rough running when the valve is stuck in the open position as well. In several cases turbos have blown but the EGR valve has not been replaced. Inevitably the new turbo unit will not last long."

Come on technical bods, lets have some more clarification on this subject!

Left:............................................. ..........Right
choked EGR 40k miles.................................EGR Bypass Tube

3rd December 2007, 13:04	#1
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	More on the EGR Bypass Valve....Modify or Leave alone Just been reading an article on Honest John an excellent review Website: http://www.honestjohn.co.uk/carbycar/ See also http://www.honestjohn.co.uk/carbycar/index.htm?md=121& This is admittedly about a Ford Galaxy 1.9Tdi, but I wonder if this would apply to 75 ZT owners who have disabled their EGR or fitted a bypass. The consequences can be dire...............read on "On TDIs, EGR valve should open to allow carbon dioxide, which acts as a cooling gas) into the combustion chambers when the engine is under load (>30% boost). This allows the combustion chamber temperature to drop and thus the temperature of the exhaust gases. If it sticks in the closed position the exhaust gas temperature will rise causing a) the turbo bearings to fail and b) engine oil into the induction system. This can cause the engine to run on its crankcase oil until it is either stalled or goes bang. Problems with EGR valves in TDI engines are often the cause of rough running when the valve is stuck in the open position as well. In several cases turbos have blown but the EGR valve has not been replaced. Inevitably the new turbo unit will not last long." Come on technical bods, lets have some more clarification on this subject! Left:............................................. ..........Right choked EGR 40k miles.................................EGR Bypass Tube __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block Last edited by Jules; 17th January 2008 at 12:26..