What Is Wrong With My 2004 3.9 Motor?

Discussion in 'Other Auto Tech' started by 04V6Stang, Jul 30, 2012.


  1. 04V6Stang

    04V6Stang Member

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    The engine idles smooth, no trouble codes, but the engine surges at the mid to upper rpm ranges while holding the throttle steady. I have replaced the air and fuel filters, spark plugs and plug wires. Where do I need to look next?
  2. BlownFiveLiter

    BlownFiveLiter have car, will race....wait, it doesn't run

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    Toss a scan tool on it anyway. Often times you'll find pending codes that don't trigger the check engine light, simply because the problem doesn't persist long enough.
  3. 04V6Stang

    04V6Stang Member

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    Good point, I'll try it tomorrow.
  4. 04V6Stang

    04V6Stang Member

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    Checked it with my scan tool today, NO codes. What next?
  5. Noobz347

    Noobz347 Stangnet Facilities Maint Tech... Er... Janitor Admin Dude

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    Manual or auto?
  6. 04V6Stang

    04V6Stang Member

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    Automatic, could it be a problem with a speed sensor?
  7. drexelsteve

    drexelsteve Member

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    Check your fuel pressure under load. Could be a fuel pump going out.
  8. 04V6Stang

    04V6Stang Member

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    Got a #0316 trouble code today after starting for the first time, engine actually idled like crap until it warmed up. That code is not listed on the chart I have. Anyone know what it is?
  9. BlownFiveLiter

    BlownFiveLiter have car, will race....wait, it doesn't run

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    P0316 is a misfire on startup for the first 1000 revolutions. How many miles and when was the most recent tune-up done?
  10. 04V6Stang

    04V6Stang Member

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    140,000. In the past two months, I have replaced plugs, plug wires, air filter and fuel filter. Before changing the plugs and wires I was getting a #3 cylinder misfire. After plugs and wires, no #3 misfire, but the mid to upper rpm surge was evident. Surge is still there after the filters were changed. #316 code was triggered for the first time yesterday.
  11. 04V6Stang

    04V6Stang Member

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    I have a fuel pressure gauge, but I don't see a stock fitting on the fuel rail to hook it to. How do you go about checking the pressure on this system, splice into the fuel line and install a gauge? Is the attached picture showing the regulator, if so, do you install the gauge before or after the regulator?

    Attached Files:

  12. drexelsteve

    drexelsteve Member

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    Yeah don't splice anything, if there isn't a schrader valve on the fuel rail you can get an adapter to go inline before tw fuel rail. But let's not get ahead of ourselves, if you are getting a p0316 now id suspect your having an ignition related intermittent misfire. Check the coil. Sometimes they will get hairline cracks on tw bottom of them. I see it all the time.
  13. 04V6Stang

    04V6Stang Member

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    A couple of posts back I explained the #3 misfire code I had before replacing plugs and wires. Since then, no #3 misfire. At that time I suspected the coil, but didn't see anything wrong with it visually. Autozone claims that they can't test the coil pack, I didn't want to just swap it out on a hunch. Is there a way that I can test it out. Can the coil have an intermittent problem and not send a trouble code to the computer?
  14. drexelsteve

    drexelsteve Member

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    Yeah with an intermittent misfire it might not set a code. No real way for a do it yourselfer to test the coil but I would still say that it is your suspect. They used that same coil on Taurus/ sable, rangers and f150s and they're easy to find in the junkyards.
  15. 04V6Stang

    04V6Stang Member

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    Just checked on Rock Auto, they have a Standard Motor Products unit listed for $30. I will probably go that route instead of hoping to find one in a wrecking yard with no issues.
  16. drexelsteve

    drexelsteve Member

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  17. 04V6Stang

    04V6Stang Member

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    Installed the new coil from RockAuto. Problem solved, runs great now. Turns out there were a couple of small cracks on the back side of the old coil.
  18. drexelsteve

    drexelsteve Member

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  19. jim dieff

    jim dieff New Member

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    buy a 5.0 lol
  20. David William

    David William New Member

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    Even my Peugeot has got similar problem.. i have changed fuel filters and water pump.. but no positive result.. I have checked my fuel pressure its normal.. now from few days there is a noise from engine and last night i found there is leakage from car.. Is it the Tank or Radiator am not sure or something else.. this engine is getting worst day by day.. i am totally fade up with it.. from last one month am try to fix it but at end of day same thing continues..
    now i have two options...
    1. should i change the engine??
    OR
    2. should i repair this??

    already i have wasted $1000 for this car.. any engine expert???
    can someone help me regarding this??



    peugeot maintenance

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