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Old 10-21-2019, 05:22 PM   #4
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,257
 

2003 L-Series 3.0L Sedan
Default Re: 2004 3.5L using oil, do I have low compression??

Whether or not anyone can determine oil consumption based on stft/ltft is debatable. One site describing how stft/ltft may help; https://www.autoserviceprofessional....for-you?Page=3. If you notice after reading thru all three pages, no mention is made of oil consumption issues. Observing tail pipe exhaust is one of several ways to determine if oil is being consumed in combustion chambers but doesn't tell you if this is valve seal leakage or piston ring wear. White smoke indicates steam, moisture turned into steam from humidity in the air since water doesn't combust. Condensation from overnight cooling is boiled as the exhaust system heats up, seen more in winter temps. Some questions need to be asked and may point to either normal or the beginnings of oil consumption issues.

If you search threads, you may come across periodic valve adjustments due to certain issues. If there's concern about possible compression issues, the best way to determine compression is with a compression gauge. Loaners from AutoZone make it less costly for one time use without buying it. Diagnosing problems can require mechanical as well as electronics knowledge since all EFI engines still use mechanical fundamentals for timing, compression, oil pressure, etc. Not everything can be determined solely from reading OBD II displays.

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