EGR effect gas mileage?
08-16-2005, 03:03 AM
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EGR effect gas mileage? My SES light has been coming on and off over the past few days. I scanned and it was P0404 egr. I deleted it it came back then went off by itself then came back again. I noticed my last two tanks the mileage was down a bit. How much to replace it? or just can I clean it and how? Any help is much apppreciated, thanks
08-16-2005, 08:54 AM
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P0404 is EGR Position error. It means that the computer commanded it open, but its actual position varied more than 20%. This could occur if its stuck shut, or the spring is weak allowing the pintle to move excessivly.
Gas mileage can be effected by loss of EGR operation. When the code sets, it disables the EGR for the remainder of the key cycle. When cruising on the highway, the EGR is commanded open. When this occurs, inert gas is recirculated back into the intake and this reduces pumping loss, therefore improving gas mileage.
At one time, the Ford Explorer was able to pass emissions without an EGR valve, so it was removed. As a result, the Corporate Average Fuel Economy (CAFE) suffered, so the EGR valve was put back on.
Gas mileage can be effected by loss of EGR operation. When the code sets, it disables the EGR for the remainder of the key cycle. When cruising on the highway, the EGR is commanded open. When this occurs, inert gas is recirculated back into the intake and this reduces pumping loss, therefore improving gas mileage.
At one time, the Ford Explorer was able to pass emissions without an EGR valve, so it was removed. As a result, the Corporate Average Fuel Economy (CAFE) suffered, so the EGR valve was put back on.
08-16-2005, 12:19 PM
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Maybe this is why I noticed my mileage went down a tad when I did my long tubes and deleted the EGR and AIR. I did get 27mpg all highway on my last tank but that was lower than what I got before...
08-16-2005, 02:36 PM
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Originally Posted by SUPRYZE
P0404 is EGR Position error. It means that the computer commanded it open, but its actual position varied more than 20%. This could occur if its stuck shut, or the spring is weak allowing the pintle to move excessivly.
Gas mileage can be effected by loss of EGR operation. When the code sets, it disables the EGR for the remainder of the key cycle. When cruising on the highway, the EGR is commanded open. When this occurs, inert gas is recirculated back into the intake and this reduces pumping loss, therefore improving gas mileage.
At one time, the Ford Explorer was able to pass emissions without an EGR valve, so it was removed. As a result, the Corporate Average Fuel Economy (CAFE) suffered, so the EGR valve was put back on.
Gas mileage can be effected by loss of EGR operation. When the code sets, it disables the EGR for the remainder of the key cycle. When cruising on the highway, the EGR is commanded open. When this occurs, inert gas is recirculated back into the intake and this reduces pumping loss, therefore improving gas mileage.
At one time, the Ford Explorer was able to pass emissions without an EGR valve, so it was removed. As a result, the Corporate Average Fuel Economy (CAFE) suffered, so the EGR valve was put back on.
08-16-2005, 08:47 PM
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Originally Posted by Black70Stang
Thank you for the quality information!
08-17-2005, 08:22 AM
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I have had very few "success" stories from cleaning them. If there is carbon buildup on the pintle causing it to stick shut, then cleaning "may" help it. If its an internal malfunction, cleaning will not help.
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09-30-2005, 10:09 PM
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Originally Posted by sdbrown84
I was wondering the same thing. When I buy headers, should I keep the emissions, or ditch them (AIR & EGR). I dont want to lose any gas mileage?
10-01-2005, 11:33 AM
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Originally Posted by oange ss
AIR sytem is only used for faster cat "light off" during start up, it has nothing to do with gas mileage, so if you have long tubes and no cats then the system is useless
Either way, it doesn't seem to "hurt" anything, so why not keep it?
10-01-2005, 10:07 PM
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It really cleans up the look of the engine without the tubes and AIR and EGR equipment. If it isn't necessary and you like a less cluttered engine, why not remove it? I'll probably take mine off when I put LT's on.
