04 Mazda 6 car V6 trouble with smoke after 46k miles

[ENVIOclev]

In the early hours of yesterday, I initiated the ignition of my vehicle's engine, which promptly resulted in the emission of smoke from the exhaust system. The smoke seemed to have a bluish-gray hue. The predominant color is gray. Furthermore, the odor emitted was not consistent with typical expectations. Upon the car's initiation, the emission of smoke subsided, however reappearing to a lesser extent when the engine is subjected to more revolutions. Furthermore, there were instances in which it had unintended consequences. Has anybody else have a similar situation with their Mazda vehicle? What is your perspective on the current situation? I would really appreciate any guidance or recommendations that you may have to provide. Thank you for your response.

[johnmayerrr]

The occurrence of smoke during the first stages of engine operation is often attributed to the deterioration of valve seals, which results in the leakage of oil when the engine is not in operation and the subsequent accumulation of oil inside the engine. The presence of continuous smoke emissions might serve as an indication of potential issues with the piston rings. It is advisable to do a compression check on all cylinders in order to determine whether any of them exhibit abnormal readings.

Additionally, I recall a mention about the PCV valve. Although I myself have not experienced this problem, it has been reported by others that it may lead to the occurrence of smoking.
 

[nicebubby8]

Between the years 2003 and 2005, a significant number of owners of the V6 model had motor replacements as a consequence of oil starvation, mostly attributed to a design flaw in the PCV valve. Could you please provide the mileage of your engine?

[ENVIOclev]

hi. Currently, the mileage on my vehicle stands at around 46,500 miles. The issue of smoke seemed to resolve spontaneously. The duration of the occurrence spanned around 48 hours, during which each instance of starting the vehicle's engine resulted in the emission of smoke. I am postulating that the issue may be attributed to substandard fuel or a related factor, since the engine continues to exhibit a little irregularity in its idling behavior. I have refrained from refilling the tank at this point, opting instead to observe the situation before proceeding to engage with the vendor.

[johnmayerrr]

The blue smoke seen is indicative of the presence of oil, rather than being attributed to poor gas quality. The potential cause for the irregular operation of the engine might be the presence of water inside the fuel mixture. One potential solution to address the issue of gasoline freezing in the tank is the use of ethyl alcohol, often referred to as dry gas or fuel anti-freeze.

It is advisable to frequently monitor the levels of oil in your vehicle to ensure that excessive oil consumption is not occurring.

[MidnightMarauder]

Is there a Technical Service Bulletin (TSB) available for addressing the PCV problem in question? What is the proposed remedy by Mazda for this issue? I am significantly intrigued, since I own an identical vehicle to that of gerard179. I express my gratitude for your assistance.

[honeycut_mazda5]

To the best of my knowledge, no Technical Service Bulletins (TSBs) or recalls have been issued pertaining to this issue. Has the engine shown any auditory indications such as knocking or ticking sounds?

[MidnightMarauder]

Thus far, I have not experienced any abnormal engine noises, indicating that my vehicle is functioning properly.
 

[DenishP4]

I had a similar issue with my 2004 sports wagon around 16,000 miles into its use in 2005. It took the dealer a duration of one week to diagnose the issue as being related to the positive crankcase ventilation (PCV) valve. The replacement occurred once, few months ago, when the vehicle had around 42,000 miles.
There is a prevailing belief that exceeding the recommended oil level by a quantity more than one-fourth of a quart may also result in the occurrence of the aforementioned phenomenon.
I am pleased to provide relevant information in my first post.

[honeycut_mazda5]

I was previously under the impression that the valve problem had been resolved starting from 2006; nevertheless, it seems that this is not the case. There have been reports indicating that individuals who own 2006 vehicles have had a similar issue, as seen by a post shared on the Mazda6 Club platform. The only solution seems to involve the installation of a secondary positive crankcase ventilation (PCV) valve in tandem with the existing one. In addition to this, regular replacement of the valve may provide a certain level of protection. It seems that the majority of Mazda6 S vehicles have not had any adverse effects from this matter, since there have been no reports of recalls or technical service bulletins (TSBs) addressing this particular problem. It is possible that Mazda has implemented measures to mitigate the occurrence of this issue. To yet, I have had no issues; however, I am diligent in regularly monitoring my oil level and ensuring the absence of any anomalous engine sounds. This probable outcome may be attributed to the presence of a component valued at $12.00. The valve used by Mazda exhibits dissimilar characteristics in comparison to the valve utilized by Ford, and no instances of analogous complications with the V6 Fusion have come to my attention.

**Revised to include**

I propose a theoretical framework that has the potential to provide a comprehensive view on the subject matter at hand. There is a perception that the PCV valve exhibits a standard failure rate and is not disproportionately prone to malfunction compared to other brands. Given the absence of an abnormally elevated occurrence rate, there would be no need for a recall or Technical Service Bulletin (TSB). In the event of valve failure, there is a possibility of experiencing significant repercussions, maybe necessitating the replacement of the engine.

[Gianni682]

I successfully replaced the Positive Crankcase Ventilation (PCV) valve. The acquisition of the item should be facilitated by the authorized vendor. The technician performed the installation on my behalf.
The cost of the item from the merchant was not high.

[motorman3]

I conducted an online search for information on the EGR modification for the Mazda6 vehicle model.