Question about 1984 Nissan 300ZX

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My 84' 300 zx was fine till the starter went out, and a mechanic replaced it for about $650.00. It zinged when I turned the key, but it started. Then it went out about 6 months later. The mechanic said it was under warranty, but would have to replace some sort of caps for about $523.00. Then the fun began with a cloud of bright blue smoke, coming from the tail pipe. Plus bad fumes, I mean fumes and smoke and then the oil light came on and a loud pinging from the engine. Yes I put a quart of oil in every 2 days and try not to drive very much. The MAN said gee it is internal, the engine, I ask if he had replaced any bad seals or other chunks that were bad thinking it just might be something simple instead of a whole new engine, and a vacation for him. Then I found you guys, so please tell me if I should rip the engine apart getting to a seal or gasket or just rip his fingers off? Help!

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  • sandic53 Oct 18, 2010

    this is suppose to be a reputable christian shop. After looking all over the internet, several answers said to check the valve seals, they could be dried out after 140,000 miles, and if the blue smoke continued to use Mega Power older motor treatment. Does this sound like a real honest solution? Why would just changing a starter cause this rotten problem?

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Sandi,
The blue smoke means that it has started consuming lube along with gas. Meaning the rings have gone. At least the oil scrapper rings would have to be changed. What happens is that when the pistons move, the oil scrapper rings clean the cylinder completely of any oil (that was here to lubricate the cylinder). Now when they move they do not scrap the oil from here, which gets burnt and produce the bluish/blackish smoke. And the proof is that you have to add oil very quickly as is happening in your case.

Posted on Oct 18, 2010

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Hi,

I would find a better mechanic, by the sounds of things the guy really don't know what he is doing, or he is just ripping you off.

Go and get a second opinion from a reputable workshop then go and take this guy to the courthouse...

In all seriousness though it is sounding like you have blown the motor and you must have a massive oil leak somewhere for it to be using that much oil.
Hope you get this sorted.

Thanks

Jason

Posted on Oct 14, 2010

  • Jason Maurirere
    Jason Maurirere Oct 18, 2010

    Well, changing a starter motor would not cause this problem, and the hardened valve stem seals is a viable answer but it would not bellow blue smoke while your driving, this is cause from one of the following:
    1. The rings in one of the cylinders has cracked and it will then be sucking oil into the combustion chamber.
    2. The head gasket has blown and the oil gallery which runs through the head gasket is leaking into the combustion chamber and causing it to smoke excessively.

    Either way get a cylinder leakage teat done and this will find out weather it is rings or head gasket or valve stem seals.

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