Engine rattling / shaking after filling from spare fuel tank - P3191

Discussion in 'Generation 1 Prius Discussion' started by jamesprius, May 16, 2020.

  1. jamesprius

    jamesprius Junior Member

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    Wow can't disconnect it. Might have to look for the one next to the fuel tank then.
     
  2. jamesprius

    jamesprius Junior Member

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    Thanks this hose was A LOT easier to remove.
     
  3. jamesprius

    jamesprius Junior Member

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    I drained out the entire tank. I guess there was some contamination. I guess the bottom of this is the old fuel?

    Filled it with fresh gallon, but engine seems to be still shaking.

    Also noticed seems to shake a lot worse on Park vs Neutral or Reverse.
     

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    #43 jamesprius, Jul 5, 2020
    Last edited: Jul 5, 2020
  4. jamesprius

    jamesprius Junior Member

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    Second flush seems to be a lot cleaner, but still no go. I guess next could try a fuel system cleaner or changing the spark plugs unless someone has a better idea.
     

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  5. Josey

    Josey Member

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    You might have gunked up the fuel filter which - as far as I know - is unfortunately in the tank. Of course, one could just say "check the fuel pressure," but that's a stupid rabbit hole all its own. Whoever designs these kinds of things should be tortured and then shot. Slowly. You know what? Just give me a GDMF schrader valve for checking fuel pressure! And an nice, normal, inline fuel filter!

    So by all means, bomb it with some fuel system cleaners for a while. Chevron techron and seafaom are my faves. And a new set of plugs is not very expensive nor very complicated so I'd never say not to...
     
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  6. jamesprius

    jamesprius Junior Member

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    Hopefully it's not the fuel filter, apparently that's stuck in tank and you'll have to remove the tank just to change the filter.

    I was thinking berryman's b-12 or gumout. It looks like b-12 is a bit strong and might eat away at the rubber and seals though.
     
  7. ronlewis

    ronlewis Member

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    OK, I skipped to the end of this thread so may be covering old ground. Do you have no other codes pointing to a misfire? 3191 can be random - something burped and it goes off. If you had a code pointing to a cylinder, you can just swap around plugs and injectors to see when the problem moves with the swap.

    You also mentioned it being smoother in Park or vice versa. That can simply mean your gas engine is not running. Does it shake as soon as it turns Ready, or 6 seconds or so later, when the ICE starts up? FYI, I'm dealing with a one-off 3191 that I'm pretty sure was caused by coolant leaking into the intake manifold through the throttle body. I've read of that leak getting worse and burning up plugs. But, you'd probably be overheating as well, as I am.
     
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  8. jamesprius

    jamesprius Junior Member

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    Hi Ron,

    The only code I had was a 3191. The engine shuts off after it starts shaking/choking for about 15 seconds if I leave it in park. That's then the 3191, which just says the engine could not start, which I guess is obvious. I don't think it's one specific spark plug but don't know til I pull them.It's also not overheating so probably not that.

    In neutral the engine still shakes but not as wildly, I assume this is because there is less fuel/air going to the ICE. (I think the ICE is still running in neutral, no?) It actually won't shut off in neutral, but didn't want to leave it in neutral too long.

    Yes it shakes after about 5 seconds, so probably the ICE.

    Your issue sounds a bit different.
     
  9. dabard051

    dabard051 Tinkerer-in-Charge

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    Late lurker here... since this started with the addition of old fuel, let me suggest that there may have been enough dirt/contaminants in the old fuel which made it past the fuel filter that the injectors are possibly clogged.

    Solution is to get rid of as much of the old fuel as possible, replace with good premium fuel and fuel injector cleaner; that MAY dissolve enough gunk to resolve the issue. It's a maybe.

    If that fails, then the injectors may need replacement. Ouch.
     
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  10. jamesprius

    jamesprius Junior Member

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    Hi yes thanks. I removed the old fuel. Filled with a new gallon but no go. Going to empty again and try with some b-12 chemtool and 1/4 gal. of fresh gas. Not sure of the ratio yet. Going to pull the spark plugs to check also. Hopefully new injectors are not needed *Crosses fingers*. That would be the last thing I can think of.
     
    #50 jamesprius, Jul 12, 2020
    Last edited: Jul 12, 2020
  11. dabard051

    dabard051 Tinkerer-in-Charge

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    Hint: if you want the engine to ALWAYS run, start the engine, turn on the AC, set it to min temp, and press the MAX button. Normally the ICE shuts off when it gets to operating temperature, then cycles as the A/C demands... the MAX button tells the engine not to turn off.

    This may speed the process to get any 'bad' fuel out of the system once you have "good" fuel in the tank.

    Good luck with the procedures...
     
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  12. jamesprius

    jamesprius Junior Member

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    Nice tip! I'm new to priuses. When it was running before, never knew when the ICE would turn on or off...
     
  13. ronlewis

    ronlewis Member

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    Injectors aren't a big deal. Easy to replace, not that expensive. I bought a set of used ones off Ebay for, IIRC, $40. Literally, the ICE never runs, after warming up, unless it has to, like when you're driving or parked/idling with AC on. I expect it stopped when you put the car in Neutral. You can always pop the hood and see - it's the left side of the engine compartment. Injectors, plugs, coils, dirty throttle body - those are the main culprits.
     
  14. jamesprius

    jamesprius Junior Member

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    Thanks. Just never had to change injectors so it seemed daunting. From the video I saw you have to remove the throttle body to get to the fuel rail and injectors.

    It's weird on neutral the ICE still tries to run, just less fuel going to engine than park. The triangle w/ exclamation pops up in neutral and the HUD mentions the battery is not being charged.

    It it normal to not be able to shift to neutral w/o power? Haven't tried on an automatic for a while. Seem's like it's harder to push a car if you can't do this.
     
  15. ronlewis

    ronlewis Member

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    No, you just remove the air cleaner. Some instructions say to bleed the fuel line pressure, but I didn't. Just lift it off, some fuel will squirt out, not much. Then, the injectors just pull out. I can replace them all easily in 30 minutes, and not even get dirty.

    Most new cars won't shift out of park without the key in the ignition - or by depressing a shift lock that's usually "hidden" somewhere around the shifter, like under a pop up tab on the console, or under the ashtray, something like that. I forget if the Prius has a shift lock.
     
  16. Q*bertZ

    Q*bertZ Junior Member

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    search this thread

    2001, Engine Vibration (missing badly), Flashing CEL

    page 3 has the way I preasure tested the fuel line
     
  17. dabard051

    dabard051 Tinkerer-in-Charge

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    JP, please keep us updated as to what you find & how you (eventually) resolve your problem.

    My story: I decided to clean all the surface dirt off the engine of my '03 Prius this weekend (lots of dust & grime). Turned on the engine, opened the hood, then hosed off the engine while the engine was running. Did this early in the run, before the engine got really warm. Somehow, some water got somewhere it shouldn't have, and the engine began to run rough. No fault codes... and a 'clicking' sound that made me suspect the oil level was low. Turned engine off; checked oil level; it was fine. Restarted; let the engine run for about 5 minutes in Park, turned it off, then restarted. The ICE ran smoothly then. So it doesn't take much water to cause the engine to misbehave.
     
  18. Nelsonprius

    Nelsonprius Junior Member

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    The air intake is just behind R headlight, need to plug that before spraying with engine off, then should be ok
     
  19. jamesprius

    jamesprius Junior Member

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    Ah ok, I guess it' just one of those things you have to do it once first. Q*Bertz thread had some nice pics of removing the injectors.
     
  20. jamesprius

    jamesprius Junior Member

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    Glad you were able to figure it out. Always heard of the engine water cleaning causing it to not start afterwards.

    So I pulled spark plugs #1, #2. They seem a bit dirty, so probably will change them after running the cleaner through.


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