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348 Do 348 exhaust manifolds fail?

Discussion in '348/355' started by Good2bgreek, Aug 2, 2019.

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  1. Good2bgreek

    Good2bgreek Rookie

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    #1 Good2bgreek, Aug 2, 2019
    Hey guys, I was driving my 348 on the highway and while at cruise I started to hear a loud noise coming from the engine. As I slowed down, it sounded like my exhaust note was significantly louder and not in a good way. Car ran but it was a little rough. No white or blue smoke from exhaust.

    Definitely coming from passenger side. Haven’t gotten car on lift to look at it. Pulled plugs and some fouling on passenger bank. Cylinder 2 looked worst. When I start car sounds like it overrevs a bit and settles into idle. I know the 355 has some issues with manifolds. Can it happen on 348 too? Any ideas on diagnosis?

    Car has factory manifolds, x-ost muffler, and high flow cats

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  2. ernie

    ernie Two Time F1 World Champ
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    #2 ernie, Aug 2, 2019
    I would first check the condition of the secondary air injection one way check valves, and the solenoids. You could have one that has failed and is open.
     
  3. steved033

    steved033 F1 World Champ
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    #3 steved033, Aug 2, 2019
    Is having just ONE that fouled a stuck injector?

    sjd
     
  4. Koenig1

    Koenig1 Formula Junior

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    #4 Koenig1, Aug 2, 2019
    I'll throw out a guess... One of your exhaust 'doughnuts'(round gasket) has failed at one of the cat connections= louder exhaust. Perhaps your o2 sensor is reading lean(because of leak) and telling the Motronic to increase fuel.
     
  5. ernie

    ernie Two Time F1 World Champ
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    #5 ernie, Aug 2, 2019
    Early 348s only have 1 check valve per bank.
     
  6. ernie

    ernie Two Time F1 World Champ
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    #6 ernie, Aug 2, 2019
    Good one! That's a possibility too. Though it would have to be on the header side of the cat.
     
  7. steved033

    steved033 F1 World Champ
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    #7 steved033, Aug 3, 2019
    I needed better grammar. Take 2.

    "Only the one spark plug fouled? Would that be an indication of a stuck injector?"

    :D

    sjd
     
  8. Good2bgreek

    Good2bgreek Rookie

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    #8 Good2bgreek, Aug 3, 2019
    Thanks for all the replies guys. I fired it up to take a look at some of these things and had it running for about a minute. It appeared that things came to a head. Engine stopped running altogether. Would not turn over anymore. This is the spark plug from cylinder two. Not good [emoji51]. Image Unavailable, Please Login


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  9. fatbillybob

    fatbillybob Two Time F1 World Champ
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    #9 fatbillybob, Aug 3, 2019
    Let me be the second to say "OH FACK"!
     
  10. fatbillybob

    fatbillybob Two Time F1 World Champ
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    #10 fatbillybob, Aug 3, 2019
    I have never seen an electrode fall. In the last 2 weeks this is the second plug failure I have heard about in a Ferrari. Prior to that I have never seen a plug fail but we replace them at service intervals just because.

    So your battery is good and motor does not turn? Bump/rocking car in gear and pistons not moving? Man this is a bad day...
     
  11. Good2bgreek

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    #11 Good2bgreek, Aug 3, 2019
    Battery is good. Motor does not turn. Bump rocking the car and it pretty much feels like the parking brake is on.

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  12. Ferrarium

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    #12 Ferrarium, Aug 3, 2019
    Did someone gap the plugs before installing them?
     
  13. Good2bgreek

    Good2bgreek Rookie

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    #13 Good2bgreek, Aug 3, 2019
    No. Iridium plugs, left them alone


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  14. A348W

    A348W Formula 3

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    #14 A348W, Aug 4, 2019
    Never seen that before, or heard of it happening!!!

    You could put a fibre optic scope in there to see what’s what; but I suspect it will just delay the inevitable.

    What make of plug are they (so I don’t put them in my 348!), how old are they and when/who put them in? (On the off chase there is any support!)
     
  15. Koenig1

    Koenig1 Formula Junior

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    #15 Koenig1, Aug 4, 2019
    Last edited: Aug 4, 2019
    X2, Yikes, sorry to hear...
     
  16. Ferrarium

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    #16 Ferrarium, Aug 4, 2019
    They look like NGK DR8EIX, that's what I use, looks like crappy ole champions are going in.
    This is unfortunate, I wonder the linkage between the noise and this?
     
  17. m.stojanovic

    m.stojanovic F1 Rookie
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    #17 m.stojanovic, Aug 4, 2019
    I wouldn't suspect the quality of the broken spark plug for the time being. As suggested by "A238W", I would first look inside the cylinders with a Borescope as it appears that the engine has jammed for some reason. The missing nose of the spark plug could just be a consequence of some impact in the combustion chamber.
     
  18. Good2bgreek

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    #18 Good2bgreek, Aug 4, 2019
    To be clear, the engine sounded ill before I changed the plugs. It sounded like there was a noise coming from the passenger side bank which made me suspect there may have been a manifold or header failure. Clearly it was probably something worse.

    At the start of the thread and you can see what the plugs looked like when I pulled them to see if I could get any information. They were changed with the last major in 2016. Since a few looked clearly fouled I switched them with the exact same plugs. NGK iridium.

    Started back up and car sounded exactly the same. After running at idle for about a minute, that’s when it suddenly stopped. Pretty sure it is completely seized now. I’m probably going to get it towed to the dealer, but I fear what they’re going to tell me.


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  19. ernie

    ernie Two Time F1 World Champ
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    #19 ernie, Aug 4, 2019
    OH!
    Not good at all!

    You need to have a look inside with a borescope to see if you can find the electrode. Hopefully you haven't any more damage than a busted spark plug.
     
  20. Good2bgreek

    Good2bgreek Rookie

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    #20 Good2bgreek, Aug 4, 2019
  21. ernie

    ernie Two Time F1 World Champ
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    #21 ernie, Aug 4, 2019
    Oh geese!!!!

    Sorry to hear this. I would do a compression test next to see just how bad it is.
     
  22. Good2bgreek

    Good2bgreek Rookie

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    #22 Good2bgreek, Aug 4, 2019
    Ernie,
    That valve looks broken off and sideways, I think which made the engine jam and piston will not move. Probably not going to hold
    compression. Tried rocking car in reverse to see if it will back off, no go. Have not been able to get a breaker bar on to try and rotate engine in reverse. My guess is either way that cylinder head has to come off. Not a good day man


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  23. m.stojanovic

    m.stojanovic F1 Rookie
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    #23 m.stojanovic, Aug 4, 2019
    I wouldn't try to rotate the engine to avoid (possible) more damage. The head has to come off. Also, inspect the timing belt - the change in sound could have been due to a camshaft initially skipping one tooth and the "crash" when there was further skip.

    (So many timing gear failures after majors)
     
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  24. Ferrarium

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    #24 Ferrarium, Aug 5, 2019
    Yes... pulley fence failure maybe the skipped belt....
     
  25. ernie

    ernie Two Time F1 World Champ
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    #25 ernie, Aug 5, 2019
    Sorry for your trouble. Keep us posted with the tear down.
     
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