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Codes after new headgasket. Water pump.

Discussion in 'Gen 3 Prius Technical Discussion' started by bobby515, Sep 30, 2024 at 8:56 AM.

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  1. bobby515

    bobby515 Junior Member

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    update found the purge sensor disconnected. plugged in got 34 mpg in traffic today. normally 38-40 on 70 degree days.
    i don't think its 1 tooth off. i listened here thinking it was a head gasket with a cheap bad borescope..the pistons looked night and day all good.
    i get the rumble when it starts 40% of the time. and on taking off till 30 mph. if i floor the car it goes fast.
    in the past a clean egr cooler fixed this. runs just a little worst before much better.
    in the suburbs. the car gets 40 mpg to 50 mpg. before new gasket.
    i also had Rumble with a bad hybrid battery. could I have a bad injector.?? thanks in advance
     
  2. bobby515

    bobby515 Junior Member

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  3. ASRDogman

    ASRDogman Senior Member

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    You should go over EVERYTHING. Check every connector,hose, everything.
    You've found several things not connected.... you may have more.
     
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  4. bobby515

    bobby515 Junior Member

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    Seems like all is connected proper. 2 things.
    Should I spray the manifold with soapy water to see if I got a leak.?
    And the fuel injectors were very grimy on the exterior. Is it possible while I removed they and spray cleaned them. I got 1 more cloged?
    At this point besides timing chain. I don't know what to look for. Overall the car don't run horrible.
    Just the rumble when starting. But like this am after sitting.it may not rumble over night . But will thur out the day. During fuel acceleration. At fuel power it's good.
    Upon checking the timing marks. Other guy here says on crank you can see the marks ??
    Explain how.
    I have no problem removal of covers to check. I just think it's something simple.
    No more codes . Had a engine power code and cly 1 code. All are gone now.
    not just in historical. But regular code.
    Evap Code is only code left in history only. All codes are gone. No check engine 100+miles driven in city 50. Screenshot_20240930_084939_Gallery.jpg
     
  5. ASRDogman

    ASRDogman Senior Member

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    Remove the rocker cover. Rotate crank shaft to TDC.
    Look at the cam sprockets, do they line up like they did when you first put
    the timing chain on? You will NOT get the timing chain colored link, unless you are
    lucky, or turn the crank enough times so they do. Just look where the SPROCKETS are.
    If they are on the marks, or place, then the timing is good.

    Don't spray water on the intake. Spray carb cleaner where the intake mates to the head.
    And spray any vacuum connections. (while the engine is running). If there is a leak, the engine
    will change speeds.

    If the injectors were fine before doing the head gasket, it's likely they still are.
     
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  6. rjparker

    rjparker Tu Humilde Sirviente

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  7. bobby515

    bobby515 Junior Member

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    Tks.
     
  8. bobby515

    bobby515 Junior Member

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    Coming to think after checking everything. Car has power. Rumble during take off. Cones and goes. Same as idle. Great than just ok.
    Mpg today normally 38 -40 at 60 degrees out 32 mpg. Wife's birthday is tommorow 51..
    Thinking you may be correct. The head gasket is not so hard like all say. Like a puzzle alot of steps only.
    If I would install the chain again. I would put maybe grease on crank to hold chain. Or a baby string that won't hurt the engine. Tie the chain to the crank only...
     
  9. bobby515

    bobby515 Junior Member

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    When looking at the crank. How do I tell if it's lined up to the chain. In the picture . Thanks for the picture.
     
  10. rjparker

    rjparker Tu Humilde Sirviente

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    You should be able to see the bottom colored link assuming the other two colored links are aligned properly.

    Hopefully you bought oem plugs and injectors and did not get counterfeits which usually sell for 1/3 or less than dealer. Remember you had disconnected devices when you changed actual oem parts which are usually very long lived.
     
    #30 rjparker, Oct 4, 2024 at 12:58 PM
    Last edited: Oct 4, 2024 at 1:49 PM
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  11. rjparker

    rjparker Tu Humilde Sirviente

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    Long shot but happens:

    In an earlier post you said

    “I also had Rumble with a bad hybrid battery. could I have a bad injector?”

    Makes me wonder if your “rumble” was not actually Pinging / Knocking / Preignition caused by low octane gas in a carboned up engine and or a low hv battery charge in a carboned up engine?

    If it only happens with the hv battery state of charge is low or it clears up with a tank of Premium high octane then it is likely Pinging requiring another hv battery and or carbon removal.

    A failing hv battery (is yours a used / or reconditioned replacement?) would also reduce mpg by 5-6 mpg.

    Again this is a long shot but pinging is easily recognizable by an experienced older mechanic.
     
  12. bobby515

    bobby515 Junior Member

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    Thanks for your answers. Let me clear up a few things. All oem parts.
    No big carbon anywhere on disable.
    Big carbon on intake and egr cooler many months ago.
    It's not pinging. 62 years old. Old guy here
    Seemed before I brought the battery it was worst.. got alot better with the h.v
    Battery .
    Before I took it all apart . It had the rumble very little. Just loss of coolant.
    I am no descriptive proper about the description. First off all codes are gone.
    Seems to me you are correct with the timing change. As it's best described as a misfire and start and low speeds mpg 32. 2 weeks ago 40 +
    If the bottom timing mark on the crank lines up. But the cams are off. Remove the cover and reset the timing gears.
    I strongly believe that this makes sense as the crank gear on the chain could easily move. During install...
     
    #32 bobby515, Oct 4, 2024 at 2:50 PM
    Last edited: Oct 4, 2024 at 3:09 PM