I have an 87 dodge dakota 3.9L V6. I just got the E.G.R. valve changed and need to get the smog pump replaced because of a horrible noise that it's making. If I take out the smog pump will that have an effect on the gas mileage? I ran it for a while without the smog pump and the gas mileage went to hell. That was also with a bad EGR. With a new EGR could I run it without the smog pump and get the same gas mileage I had before? Thanks for your help.
Smog pump and Gas Mileage and E.G.R. valve
Feb 20, 2006
5 Replies
Not for long. The smog pump provides enough air in the exhaust stream for the catalyst to do its job. Without air, the catalyst can't completely burn the HC and CO, so it runs too cold, carbons itself up and eventually plugs solid.
Thanks Steve. Do you mean the E.G.R. valve plugs solid without the smog pump? Again, thanks for your help.
No, the catalytic converter itself is likely to fill up with carbon and cause an exhaust restriction.
EGR valves plug with carbon no matter what you do :-/
Steve, You have been a tremendous help thank you. Would it be safe to leave the smog pump off for another 2 weeks of light driving?
That's hard to say. It would *probably* be OK. Who knows what condition the catcon is already in, though?
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