Disable EGR Valve, Problem???

Discussion in 'General Motoring' started by Tom M, May 4, 2004.

  1. Tom M

    Tom M Guest


    I have a Plymouth Voyager (98) with a 3.3L about to turn 100K miles.

    The check engine light just came on indicating low egr flow (which I
    guess means its not opening). The vacuum supply line is good.

    What I'd like to know is will it cause any problems if I simply didn't
    repair it? I only want to keep this luxury sled about 1 more year.

    If I disable the EGR (by blocking the vacuum hose or other way), how
    to I silence the check engine light for this alarm?

    BTW, we don't get smog checked here.

    Tom M, May 4, 2004
  2. Yes. You will have reduced mileage and the risk of engine damage, as well
    as the likelihood of causing yourself more costly repairs. This is not
    1974, when emission control devices were slapped on piecemeal. The EGR
    system is integral to the engine management system's efficacy.
    What has this to do with anything? Fix it!
    You don't.
    So? Even if the *only* effect of a malfunctioning EGR valve were increased
    emissions -- which it is not -- everyone has to breathe whatever crap your
    vehicle puts out, regardless of whether you get smog checked or not.
    Selfish attitudes like yours are what brings the hassle and expense of
    smog checks to more and more new areas every year.

    Daniel J. Stern, May 4, 2004
  3. Tom M

    Steve Guest

    It may simply be a clogged valve or passage. Removing the valve and
    cleaning it, and blowing out the passages with compressed air may be
    sufficient to get it working again.

    On modern engines, EGR is used as a means to suppress/reduce detonation
    and knocking WITHOUT excessively retarding timing in addition to
    controlling emissions. When EGR fails to work correctly, at a minimum
    the engine controller has to retard timing and therefore reduce
    efficiency... at WORST the computer may not be able to control
    detonation completely and engine damage can occur. Most Chrysler engines
    I've dealt with can compensate enough to avoid damage, but I wouldn't
    risk it for long. Some engines (notably some 80s Cadillac v8s) will
    pretty much self-destruct when EGR quits.
    Steve, May 4, 2004
  4. Tom M

    Mike Romain Guest

    How do you figure that?

    A loose gas cap or a dirty air filter will cause the check engine light
    to come on as well as a whole pile of other things.

    Did you get the engine codes to narrow it down?

    86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
    88 Cherokee 235 BFG AT's
    Mike Romain, May 4, 2004
  5. Tom M

    Jim Guest

    I've been running with the EGR disconnected on my car for over 10
    years. No damage, no reduced gas mileage. In fact, the car has a bit
    better throttle response too.
    Jim, May 6, 2004
  6. And the model and engine of you CAR is?!?! (The Plymouth
    Voyager happens to be a VAN)

    Ted Mittelstaedt, May 6, 2004
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