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{ENGINE} Interesting EGR Info.....

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    {ENGINE} Interesting EGR Info.....

    I found this posted on corral.net. So, if you got a EGR code (31,32,33,34 or 35) and have crappy MPG, this might explain why.
    This also applies to all you guys who think blocking off the EGR "improves" performance.

    Quote:
    "you shouldn't run the block-off unless you're either not running EGR or there's an alternate supply for it, because...

    ...the fuel management strategy assumes the presence of a functioning EGR system and you'll get an overly lean part-throttle cruise if you block it off and don't have a chip tune to tell the computer not to...and when you have a lean part-throttle cruise, the EEC picks that information up from the O2 sensors and adds fuel. But it doesn't just add fuel to part-throttle cruise operation, it adds compensating fuel even during open-loop (non-O2-feedback) conditions such as startup, idle, and WOT.

    Short story is since the EEC assumes a functioning EGR, and if you haven't instructed it otherwise, you're setting yourself up for rich running and resulting performance/driveability issues by blocking off its flow."
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    #2
    So true. It's good to have a littel extra fuel, but too much just makes thing worse. And if its adding more fuel to the open-loop mode, that is deffinantly too much.

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      #3
      I solved that problem by pulling the computer.

      Too much fuel can also fuck up your cats.
      Pebbles-1968 Ford F250
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      Comment


        #4
        A 3 foot pole is what *ucked up my cats. LOL Gut them suckers!

        Still a rich fuel mixture can cause a good se of cats to get red hot. Can even melt down the inside of the cat which is how it ruins them.

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