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Old 11-29-2012, 10:31 AM   #1
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Question Can a bad EGR valve affect MPG?

I'm just curious if a bad EGR valve decrease gas mileage? I am pretty sure mine is still good (I know how to test it to confirm) but was just curious if this affects MPG if the EGR is bad? And if it's "not performing well" or completely failed, will a code ALWAYS be thrown?

Also, does a bad DPFE decrease gas mileage? And does it ALWAYS throw a code when it's not performing well or completely failed?


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Old 11-29-2012, 11:21 AM   #2
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Yes it does. A bad valve or if you use a tune to kill the EGR valve will lower MPG.
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Old 11-29-2012, 11:26 AM   #3
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Will it always throw a code if bad? Reason I ask is that I've read the DPFE can be non-performing (supposedly not "completely" bad) and not throw a CEL or equivalent.
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Old 11-29-2012, 11:37 AM   #4
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[QUOTE=PWGuy;4475786]I'm just curious if a bad EGR valve decrease gas mileage? I am pretty sure mine is still good (I know how to test it to confirm) but was just curious if this affects MPG if the EGR is bad?
>>>A stuck egr valve stuck open will make the motor run cruddy.<<<
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Originally Posted by starfuryt550 View Post
Yes it does. A bad valve or if you use a tune to kill the EGR valve will lower MPG.
How does having the egr closed or turned off w/ a tune effect mpg, when you are not interducing exhaust back into the motor, via the egr. IDK its open when cruising or light thottle postions.
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Old 11-29-2012, 12:40 PM   #5
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The EGR valve is not going to affect MPGs at all unless the engine is messed up anyway.
On my former ride, a Contour SVT i made several plates to fully or partially block the EGR.
THey never afected the mpgs in any way, over tens of thousands of miles.
The primary effect of a blocked EGR valve is having some engine slowing power instead of just zero.
(I forgot the right words for this (getting to damn old) but it allows one to use the engine to slow one down if you have a manual tranny)
Otherwise no problems at all. (except if the EGR is totally blocked it will throw a code)
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Old 11-29-2012, 01:47 PM   #6
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Quote:
Originally Posted by Elizabeth View Post
The EGR valve is not going to affect MPGs at all unless the engine is messed up anyway.
On my former ride, a Contour SVT i made several plates to fully or partially block the EGR.
THey never afected the mpgs in any way, over tens of thousands of miles.
The primary effect of a blocked EGR valve is having some engine slowing power instead of just zero.
(I forgot the right words for this (getting to damn old) but it allows one to use the engine to slow one down if you have a manual tranny)
Otherwise no problems at all. (except if the EGR is totally blocked it will throw a code)
Perfect, that's what I needed to know - thanks!

What about the DPFE Sensor that attaches to it?

Thanks again
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