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  1. 05 STS pinging, no check engine light

    Cadillac STS Forum 2005 through 2012
    Hi has anyone else had a problem with their lh2 Northstar pinging? It doesn't matter what gas I use, I've been running 93 octane and I still get a ping, and no check engine light at all, or codes? It just started out of the blue. Right after I had power steering pump replaced. Thank you for any...

  2. 2005 STS 4.6L P0174 - phantom vacuum leak

    Cadillac STS Forum 2005 through 2012
    The white whale I have been chasing for a few years. My LH2 (~65k miles) has high LTFT (over 20%) on both banks during high engine vacuum, though bank 2 is higher and thus occasionally (maybe every four months) sets a P0174 after extended driving. At cruise or acceleration, LTFT are above 0% and...

  3. New cylinder heads after 90k miles and failing timing chain tensioners

    Northstar Engines and System Technical Discussion
    As a result of driving on LPG, I experienced compression leakage during cold run on cyl. #1. Both the inlet valves leaked as a result of burnt valves/seats due to lean mixture burning in cyl.#1 causing a higher combustion temperature. The lean mixture was a result of bleed air being mixed at the...
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