Question about 2004 Infiniti I35

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What causes Blue-Grey smoke when it's first started for the day?

It has 155,000 miles. It's almost always had Infiniti dealer Service. And most of the time it smokes for 15 to 90 seconds only when it's first started and below 70 degrees. The colder it is, the longer it will smoke. It smells like burnt oil. So what are the most common causes, from most likely, to least likely?

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  • Bob Rest
    Bob Rest Mar 26, 2014

    But can worn valves or valve guides also cause it? And should I check for fouled spark plugs? If any are fouled, what does it mean?



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  • 46 Answers

Most likely- oil getting past the rings. Regular oil changes lately? Have you tried synthetic blend oil? Or full synthetic? There are also valves and gismos and thingy's on the Nissan and Infiniti that go bad and could cause same thing. Even your air filter, is it clogged?? Air flow meter and switch ( sticky or bad switch) also on those get varnish deposits and your air "flap" for your induction may not be opening properly, a good intake cleaner could help, and the cheapest to try !!!
Do you sit in a lot of traffic? Not a lot of full running? Low quality or wrong octane gas? Back to the air flow, it could be "choking" like on the old carb jobs. Dirty and the choke does not open fully or gets stuck, gave the impression you were burning oil, but it was just burning too much fuel at startup and it is a similar odor. Same effect with air flow meter and flap. Worked as a Nissan mechanic for almost 20 years in Wash DC and this was common because of traffic and idle times. Oh, and cheap and wrong gas, very important for the long run.

Posted on Mar 26, 2014


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Posted on Jan 02, 2017

  • 1118 Answers

SOURCE: burns oil on start up only

the dealer is right its a valve stem seal, when it sets valve not moving oil when hot will seap down thru valve seal into combustion chamber hense oil smoke when you start it up. its burning oil when your going down the road you just cannot see it because its such a mynute amount, because oil is moving and dosent get a chance to run into cyl. like it does when its setting, but its burning it. if its fouling a plug its bad and may be more than just a valve like maybe oil ring on piston. i got 40+ years of experance working on autos and trucks and if its using that much oil in just 100 mi. you got to be seeing something.

Posted on Jan 26, 2009

  • 7 Answers

SOURCE: Maintenance Required

Read the Manual that came with the car. It will tell you how to turn the maintenance signal off. Cant remember, been a while since ive done it. But i know 100% its in the manual.

Posted on May 05, 2009

  • 2004 Answers

SOURCE: 2008 infiniti g37 motor is knocking has 16500 miles on it.

Please change the oil now at the Nissan garage and watch the vehicle closely.

$100 is not so much like getting your car totally knocked.

Good luck and rate this solution/ suggestion.

Posted on Aug 25, 2009

  • 6 Answers

SOURCE: My 2005 Infiniti G35 ran hotm made rumbling noise

very probable that your head gasket went out.

Posted on Aug 04, 2010

  • 17970 Answers

SOURCE: Infiniti G35 - 2006 Sedan

Smoke on start? Could be a valve problem where all your oil is in the bottom at start? Belts are squeaking too? Maybe a tensioner went bad?

Saw this service bulletin---

This bulletin amends ITB02-049. This version amends the Applied Vehicles.
Please discard all paper copies of the earlier version.
APPLIED VEHICLE: 2002 - 2004 Q45 (F50)
2003 - 2004 M45 (Y34)
2003 - 2004 FX45 (S50) with V8 engine.
A tapping or knocking noise (similar to a piston or valvetrain noise) when starting a cold engine,
NOTE: The engine is considered “cold” when it has been OFF (not running) for several hours.
1. Dislodge and remove any carbon deposits that may have caused the noise and confirm that carbon
deposits were the cause of the noise.
• While the noise is occurring, quickly rev the engine several times to approximately 4,000 RPM. Then
release the accelerator quickly, as soon as the engine reaches 4,000 RPM.
• The noise should disappear immediately if carbon deposits are the cause.
• If the customer reported a noise that exactly matches the symptoms listed above, but you cannot
duplicate it, the cause may still be carbon deposits. Go to step 2.
• If the noise does not stop after revving the engine, or you observe any other noise that doesn’t match
one described above, go back to ASIST for further diagnostic and repair information.
2. To prevent this incident from occurring again, add a bottle of Nissan In-Tank Fuel System Cleaner
P/N 999MP-FSC00P to a full tank of fuel (in the vehicle’s fuel tank) according to the instructions on the
• This product is proven to reduce carbon deposits on pistons and combustion chambers, as well as
cleaning other components of the fuel system.

Hope helps.

Posted on Sep 08, 2010

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