Hard start/ Help with Auto Enginuity

Discussion in 'Domestics' started by GM Guy, Jan 4, 2018.

  1. GM Guy

    GM Guy Full Member

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    Please fill out the following to ask a question.

    MAKE:Chevy
    MODEL:Monte Carlo
    YEAR:2004
    MILES:148k
    ENGINE:3400
    DESCRIBE ISSUE....First, forget the Auto Enginuity question, I'll ask that later.
    I've got a rough idle when hot in gear and it has died a time or two. When restarted (lots of crank, sometimes multiple tries) it acts flooded (smell gas). This happens after engine is hot and has sat a little while ( hot soak). Tonight I checked fuel pressure ( factory pump still), it's between 48-55 PSI, no bleed off. Over the weekend it threw a P0300, random misfire code when the wife was driving it. I cleared it and it hasn't reset. It still has factory plugs/wires on it. I took it for a drive and accelerated hard to try to starve it for fuel or stress the ignition (look for a miss under load) and the old girl pulls hard and never stumbles. I'm leaning toward plug/wire replacement, but I don't want to just throw parts at it. Any of you professional wrenches have some wisdom for me?
     
    Last edited: Jan 4, 2018
  2. Mobile Dan

    Mobile Dan wrench

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    Dirty MAF sensor if it has one?

    Dirty throttle body?

    EGR stuck partially open sometimes? Usually on these engines, plugged EGR passages are a problem, but that won't cause your symptoms.

    If plugs and wires have never been changed, you are overdue. Might be your only problem.
     
  3. GM Guy

    GM Guy Full Member

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    Is the fuel pressure in the good range? I googled it but don't trust everything on Google. Like I Do trust this site.
     
    Last edited: Jan 4, 2018
  4. Mobile Dan

    Mobile Dan wrench

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    Fuel System - Gasoline Pressures 3.8LFWD
    Fuel Pump Pressure Minimum
    59 psi
    Key ON Engine OFF (KOEO) 53-59
    RPM 43-56 @ Idle rpm
    Fuel System - Gasoline Pressures 3.4L -----------------------------------
    Fuel Pump Pressure Minimum
    59.0 psi --------------------------------------
    Key ON Engine OFF (KOEO) 52-59-----------------------------------------
    RPM 42-56 @ Idle rpm
    Fuel System - Injector Resistance 3.8L
    Injector Primary Resistance
    11-14 @ 68°F ohms
    Fuel System - Injector Resistance 3.4L
    Injector Primary Resistance
    11-14 @ 50-95°F ohms
     
  5. nickb2

    nickb2 Wrench. I help when I can

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    If you can pull codes, you know what OBD2 means, do you have live data. Cuz I would sure like to know the ECT readings.

    As for auto enginuity, I am always up for those kinds os discussions. It's kind of a hobby of mine when I am not drinking beer or working.

    ;)
     
  6. nickb2

    nickb2 Wrench. I help when I can

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    Thx, that means a lot to old geezers like us.

    :):bat:
     
  7. nickb2

    nickb2 Wrench. I help when I can

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    OEM is good, so if you want to put new stuff in "the old girl" I suggest you don't cheap out.

    Every secondary ignition system like this is boss, but has a limitation.

    BTW, holy cow, called a taxi for my gal to go to work this morning, taxi got stuck in a snow bank high as my knees. I said, WTF, do you need glasses?

    What a storm. Quebec is getting hit hard, but I sure am happy I am not in nova scotia right now. Needless to say, only way out of that one, shovels, a bit of elbow grease and on your way. When shyt hits the fans, ppl need to stick together.
     

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