how do I bypass egr valves
 

I have see a post about bypassing egr's but I can not find it now. we have a 07 Volvo 780 with a d12 engine, we just replace the egr and want to now bypass or stop the exhaust flow to them, I had see a guy's post from Canada but cant find it now can anyone help me.

If your truck has a DPF, it is not a good idea to bypass the EGR. You'll destroy the DPF and cause all kinds of problems for yourself. If you don't have a DPF, at least with my Cummins ISX, all you do is let your engine cool overnight. Then, turn your key to the "ON" position for a couple minutes (DO NOT START THE ENGINE, just turn the key on), which will allow the EGR valve to completely close. Turn the key off and then unplug the power plug at the EGR. It's that easy. You might get warning lights. Some people do and some don't. You can also weld a plate over the exhaust port in the EGR valve, but that's not easily reversible. I'm not 100% sure the method that works on my Cummins will work on your engine. All you can do is try, I guess.

Just been reading an article on Honest John an excellent review Website:
www(dot)honestjohn.co.uk/carbycar/
See also
www(dot)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
Jacob Hoppe
transportation company
[ATTACH=CONFIG]1296[/ATTACH]