What's the difference between the various "models" of Chrysler 3.3 motors?

Discussion in 'General Motoring' started by Guest, Jul 28, 2004.

  1. Guest

    Guest Guest

    I have a '99 Grand Caravan with a 3.3 "G" motor (flex fuel) and the bottom
    end took a dump. I can rebuild what I have (119k+ miles on it) but I prefer
    to swap in a used motor with reasonable miles and then rebuild my old motor.
    Thing is I am having trouble finding a compatable engine. I was told that I
    cannot use earlier model enigines ( thru '97?) nor can I use later model
    engines ('01 - current). I was also told that I cannot use a standard "R"
    code motor - even if it is a '99. The last really seams strange as I could
    simply swap the my entire existing fuel system on the the "R" motor.

    Can anyone tell me whether or not I can use one of the "other" 3.3 motors?
    The '01-current motors would be great as I have found a couple of them with
    very low milage at a reasonable price.

    TIA for taking the time,
    Guest, Jul 28, 2004
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  2. http://www.car-part.com , searchable used auto parts nationwide. When you
    put in the VIN code of your engine, the search results show only
    compatible engines.
    Daniel J. Stern, Jul 28, 2004
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  3. Guest

    Guest Guest

    OK. Thanks. However I still want to know what the difference is between
    the differrent 3.3's.
    Guest, Jul 29, 2004
  4. Guest

    Bill Guest

    97 is one version of the 3.3. Then changes to the engine for 98 and 99. Most
    parts interchange between 98 and 99 but not with 97. Mainly due to emissions
    reg changes. In other words the 97s were one group of engines and the 98-99
    were another group of engines. The biggest difference between the G and the
    R engines is the PCM software. The G engine PCM software is capable of
    "learning" the use of up to 85% ethanol (E85) in the fuel tank by watching
    the O2 sensor (called sensorless flex fuel). Alcohol burns leaner. After it
    learns that there is 20% E in the tank, all OBD2 monitors are turned off.
    When E content drops below 20%, then the ECM calculates the number of
    tankfuls of gas that have to go through the engine before OBD2 monitors are
    re-enabled. The EPA awards emissions credits to mfg's that go beyond certain
    emissions minimums on a particular engine pkg. They can then use those
    credits against other engines that don't quite meet a spec somewhere else.
    It's balanced out by the "total emissions produced" by all engines built.
    There are people in the auto mfg's that make a living keeping up with this
    crap. (emissions credits) (not me). Most of the 3.3's between 96 and 2000
    were "G" engines, to earn the credits. "R"s would be sold in areas with less
    stringent emissions regulations.

    Bill, Jul 31, 2004
  5. Guest

    Bill Guest

    98 and newer. I misspoke :)

    Bill, Jul 31, 2004
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