Re: Off Topic....Need advice for ford pickup....follow up

[Amcjrb@xxxxxxx]

Pretty sure that the opposite is true, the EGR only works off idle at relatively high RPMs.  Thats why opening the EGR of a car at idle (by manually pressing the diafragm will stall the engine.

Jim Bolton

On June 30, 2005 Frank Swygert wrote:

> Pull the EGR valve and clean it real good. Then take a pipe cleaner and/or wire and clean the passage out very good. Pay close attention to the seat and plunger. You don't want to scratch the seat or sealing face of the plunger. You can use a fine sand paper/emery cloth on the plunger, use brake cleaner to spray out the seat area. Now check the vacuum line running to the EGR, and the EGR servo if there is one, and vac liine from it to manifold or junction block. Once the EGR is cleaned put it all back in and see what happens. If it still runs better with the EGR unplugged leave it unplugged with the hose plugged until inspection time (if there is an inspection). The diaphragm in the EGR is probably cracked or has a pin hole and is leaking vacuum. The other possibility is the vac servo or spring in the EGR is broken and it isn't sealing properly. Cleaning the seat and plunger may fix the sealing problem though.
> 
> EGR is not a power robber like some people think -- not if it's working properly. It only affects low speed running -- it turns off shortly after idle speed. Putting exhaust gas back into the combustion chamber robs the mixture of oxygen and lowers combustion temps, which in turn lower NOX emissions at low speed. As you speed up the engine cools better (most likely due to higher coolant flow) and EGR isn't needed. A leaking EGR (leaking exhaust gas into intake all the time) WILL rob an engine of power for the same reason -- diluted mixture doesn't burn as hot.
> 
> 
> On June 29, 2005 jamie smith wrote:
> 
> > A friend of my boss said he'd look at it so he took it to him on sunday. The friend messed around with it for a bit and checked different things and in the process of checking things he unplugged the egr valve and the truck started running better. Dale took it for a drive and tried it out and it is still not as good as it was when we got it but it is running alot better and has alot better power. Now, how do we determine if it is the egr valve that is bad or if it is something else causing the egr to cause a problem? Any other ideas? The egr valve for it is $125 so he doesn't really want to replace it if that is not the problem. Thanks.
> >
> >
> > Jamie Smith
> > Spokane, WA
> > oconner51@xxxxxxxxxxx
> >
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