Knocking and rattling sound, no codes shown on techstream

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Baje, Jun 14, 2019.

  1. Raytheeagle

    Raytheeagle Senior Member

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    You got an endoscope to look at the piston heads through the spark plugs?

    After one month, that oil would have me concerned.
     
  2. Baje

    Baje Junior Member

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    Well first time seeing the oil, last month when the plugs were changed, they had the usual wear, I actually still have them. Unfortunately I haven't got an endoscope, hoping it's just a plug seal gasket. Calling around now to see if anyone has an endoscope I can borrow.
     
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  3. Mendel Leisk

    Mendel Leisk Patron saint of newly poured sidewalks

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    I wonder if a moderator could edit the first post, put in some paragraph breaks. Something like this:

    ====

    Hi all, I have a problem that I thought was solved about a month ago. It all started when I was parked outside one of my clients house which is at the bottom of a hill. When I moved off I heard the loudest knock and engine shake coming from the car engine and it continued all the way home, no CEL illumination. Parked car at home and connected techstream still to see if I could see if anything was wrong.

    Fast forward, took it to mechanic, fair acknowledgement here, we have no hybrid savy mechanics here besides the dealer. Did all sorts of checks, I left the vehicle with him, came back and all sorts of codes where there, inclusive of codes relating to misfires, cleared the codes and the only one that stayed was on No 3.

    I assume this was from him pulling the plugs to see what was happening. No 3 ignition coil had completely failed, side note EGR valve, cooler throttle body and everything else in there was cleaned of carbon was blocked up.

    Ok so back to no 3 ignition coil, while we were checking to make sure it was indeed the coil, I remember him saying he's going to adjust the magnet in the EGR valve, instead of tightening it completely he slightly backed it off. Car wouldn't start but this was because it was out of gas also, bought gas filled her up, recharged battery part ways with hybrid reconditioning pack.

    Car started then cut out, moved the ignition coil and the code followed the ignition coil. So bought new ignition coil, car started and no noise or knock and ran better than ever before.

    Fast forward one month and same thing again, noise started with coming over another steep hill and no codes. Checked EGR valve because I thought that might actually be the issue, why? Reason is after car left mechanic the next day I cleaned the engine down and I was checking the magnet in the valve, just being curious. Put it back on and car was knocking and shaking, I took it back off turned the spring around and it stopped all the shaking and knocking. So I thought it was that once again. Took the magnet off and realised that the magnet had spung all the way up and not locked off and the spring was actually stuck inside the magnet, this didn't happen last time the spring stays on the valve itself.

    Ok so went to the ignition coils, pulled them while car was in maintenance mode no 1 2 and 4 shows a pending code once pulled on my OBD2 was just quicker than techstream at the time, the thing about number 3 it shows a definite fault code and not pending. I changed the coils around still the same, clear the codes and all codes go and stay away. No change in engine noise.

    Could there be something wrong cylinder 3 that it shows definite fault and not pending like the others or is it my EGR valve starting to fail. I don't want to be spending aimless amounts of money when the parts are limited and so expensive here. No used parts in my part of the world, which is Barbados btw.

    ====

    I've "reported" my post, maybe the moderators can revise.
     
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  4. bisco

    bisco cookie crumbler

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    tl;dr :p
     
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  5. Raytheeagle

    Raytheeagle Senior Member

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    Short and sweet does have its place :).
     
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  6. Baje

    Baje Junior Member

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    I tried, for some reason it won't let me.
     
  7. Mendel Leisk

    Mendel Leisk Patron saint of newly poured sidewalks

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    There's a time limit, maybe 12 hours. But a moderator can fix, I've reported my post above, they'll maybe cut-and-paste that in. I didn't change anything, other than add breaks. :)
     
  8. Baje

    Baje Junior Member

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    Ok so placed car in maintenance mode then pulled ignition coils one at a time, when two and three pulled, engine knocked.
    I reconnected them and knocking stopped, engine just missing and like it's not getting a constant combustion. I scanned to see the codes and clear them. Screenshot of the codes are attached.
    I'm going back to one of my original questions, is there something going on by ignition coil 3/ cylinder 3? All the others read pending from the pull, that one shows current fault.
     

    Attached Files:

  9. Baje

    Baje Junior Member

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    Update on everything, after closer inspection of the plugs I decided that since number 2 & 3 plugs still looked good and I had changed the coil pack on those two I decided to research the condition of the other plugs that looked like they were soiled.

    What I found out is that it means they were burning rich, so I decided to replace both ignition coils on 1 & 4 and voila , car runs perfect once again.

    I wonder why no codes showed up to say that I was having a misfire though. Thanks everyone for your time and input.
     
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  10. Tim Jones

    Tim Jones Senior Member

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    Thanks...! I will remember this......
     
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