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Engine Knock? Or exhaust leaking? 850

posted by  someone claiming to be Yuri on  Fri Oct 22 14:04 CST 2004 [RELATED]

I recently noticed an odd noice on a cold engine. It only exists when I accelerate, go uphill, etc, where the load is higner. No noise at any rpm in Neutral. When the engine warms up this noise is much lower.
The noise is like engine knocking (pinging), not sevre, but I never had one before. When I open windows and listen to reflected sound it is like exhaust leaking. The engine has 136K.

Do Volvo engines of this model knock? If they do, would I pull some codes from the computer?

Yuri








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    Engine Knock? Or exhaust leaking? 850

    posted by  someone claiming to be 97 T5 on  Sun Oct 24 09:32 CST 2004 [RELATED]

    I have a 1997 T5. Same noise....sounds like either lifters ticking or an exhaust leak. It only occurs under load, when driving. Applying the brake and pressing the accelerator while parked will not duplicate the noise.

    Oil level is good (changed recently, new plugs, etc.

    Any suggestions?








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    Engine Knock? Or exhaust leaking? 850

    posted by  kshaw on  Sun Oct 24 04:44 CST 2004
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    last visit: Wed Oct 29 13:11 CST 2008
    [RELATED]

    Sounds like pinging. Try using fuel with a higher octane and see if problem goes away. Many cars (don't know about the volvo but my BMW had it) also have an anti-knock sensor that is supposed to adjust the timing to prevent this. The sensor may be bad too.








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      Engine Knock? Or exhaust leaking? 850

      posted by  someone claiming to be Yuri on  Sun Oct 24 13:12 CST 2004 [RELATED]

      I am already using 93 octane. I wonder if a bad knock sensor will be throwing codes.






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