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I just purchased this G35 from someone who recently got it from an auction. It’s started smoking after an “oil change”, but the oil is black. There are several oil leaks including on the spark plug and coil for cylinder 4. It’s smoking pretty bad from the exhaust. Didn’t pay much for it. Trying to diagnose the issues before purchasing a new engine.


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There's very little you can diagnose from just pulling apart the intake plenum. From the oil staining, I'd guess there's some blowby of the valves or rings (perhaps both). It would be helpful to know:

-Year and mileage of the G35?
-Any service history of the car?
-Results of a leakdown test?
-Any compression test?
-Any ECM codes in memory?
 

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Discussion Starter #3
There's very little you can diagnose from just pulling apart the intake plenum. From the oil staining, I'd guess there's some blowby of the valves or rings (perhaps both). It would be helpful to know:

-Year and mileage of the G35?
-Any service history of the car?
-Results of a leakdown test?
-Any compression test?
-Any ECM codes in memory?
2007 with 155,264 miles. No service history. Purchased from dealer who got from auction the week prior. I haven’t performed a leak down test or compression test yet. I plan on doing it tomorrow. No codes. Sending off the oil for testing.


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To get a starting point, take the VIN to a local Infiniti dealer and request the service history on this car.
 

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Pretty significant compression losses on the left bank. The right side isn't perfect either. That VQ needs a full rebuild and that's why a peek at the previous service history might provide a clue.
 

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Pretty significant compression losses on the left bank. The right side isn't perfect either. That VQ needs a full rebuild and that's why a peek at the previous service history might provide a clue.
Thank you dkmura!

I’m going to buy a new engine. Gives me something to do.


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From that pic of the engine bay- I'd say you have PLENTY to do. Don't know what you paid for it, but that looks like a wreck to me.
 

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From that pic of the engine bay- I'd say you have PLENTY to do. Don't know what you paid for it, but that looks like a wreck to me.
It was whole. I took it apart after the compression test. I only paid $500. Interior is better than others I’ve seen online for sale.


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It was whole. I took it apart after the compression test. I only paid $500. Interior is better than others I’ve seen online for sale.


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Hey, if you got a clean title with that G35 for $500 that could be a good deal. Still a lot of work. I also wonder what kind of maintenance your VQ got to cause that kind of damage.
 

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Hey, if you got a clean title with that G35 for $500 that could be a good deal. Still a lot of work. I also wonder what kind of maintenance your VQ got to cause that kind of damage.
I will check with the dealer next week as you recommend.


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Call before you go to the dealer. If the car was running, they might just look at your registration. But since it's not, and the only thing you likely have is a bill of sale, they may or may not be willing to share the G35's service history.
 
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