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shaking engine

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  • fabz77gp@aol.com
    i gotta 98 coupe with a 3.8 series 2 nonsupercharged. 2 wks ago i put dry gas in my car cause it was gonna be below 0, and afterwards i went to the same place
    Message 1 of 2 , Feb 3, 2007
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      i gotta 98 coupe with a 3.8 series 2 nonsupercharged. 2 wks ago i put dry
      gas in my car cause it was gonna be below 0, and afterwards i went to the same
      place for regular gas. i usually pump 87 but recently for the past week its
      been shaking like hell. the whole car sounds like it has a high duration cam
      and its supposed to run smooth. i mean it sounds pretty cool but its not
      supposed to run like that though. could it be stale gas, spiked tank w/sugar,
      woodshavings, etc?? any ideas? will this go away? is my engine about to blow? (god
      help me)
      -fabz-


      [Non-text portions of this message have been removed]
    • rsjherb
      sounds like that drygas may have damaged your fuel pump or a fuel injector or more than one injector. First check your fuel pressure with an accurate
      Message 2 of 2 , Feb 5, 2007
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        sounds like that drygas may have damaged your fuel pump or a fuel
        injector or more than one injector. First check your fuel pressure
        with an accurate guage,you should have around 40-45psi minimum.remove
        the vacuum line from the fuel pressure regulator and the pressure
        should increase about 5 more psi on top of your idle pressure of 40-45
        psi.If pressure is lower than stated replace the pump and the fuel
        filter.Injector testing is a little more tricky.There are a few ways
        to diagnose a bad inector. One with the car at idle unplugg each
        injector until you find the cylinder that doesnt make a difference
        unplugged.That will be your suspect cylinder, check that cylinder for
        compression, spark,injector pulse to isolate the fault. The second
        test method is with a scan tool and observe your missfire data.Find
        the missfiring cylinder and do a injector balance test with the scan
        tool.You can disable and activate each injector with the scan tool and
        observe fuel pressure drop by activating each inj.Third test same as
        second without scan tool. Jump each injector while observing fuel
        pressure drop on gauge with engine off. this will tell you if you
        have a dead injector.apply power to one side of injector and quickly
        ground the other terminal real quick to simulate a quick inj pulse.
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