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Registered:
October 2004
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 Pinging noise?
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Sat, 27 November 2004 07:27
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My mx62 (cressida) makes a noise that...I've adjusted the timing just under the rocker head cover to the specs that the Haynes manual i have specifies... she idles ok without pinging but after i rev the car the pinging comes after i take my foot off on the deceleration... does anyone have any ideas what the problem is here?
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Location:
Brisbane
Registered:
May 2002
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Re: Pinging noise?
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Sat, 27 November 2004 13:19
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"Pinging" (ie detonation) only happens under load, so your engine isn't pinging. It's pretty hard to diagnose your problem without being able to hear it, but at a guess I'd say there's something amiss in the bottom end, eg dud big end bearing. M engines are known for these sort of problems as they get older.
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Location:
tallahassee FL usOFa
Registered:
May 2002
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Re: Pinging noise?
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Sat, 27 November 2004 15:56
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instead of "ping", how about the "zap"or "snap" or "crackle" you hear from high voltage electricty jumping an air gap.
plug wires, else i'm with Norbie.
there was a very similar misleading description in a recent post.
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Registered:
October 2004
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Re: Pinging noise?
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Sun, 28 November 2004 05:43
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i appreciate the advice...it could the bearing thing that Norbie
said...perhaps I'm not saying the right sort of noise.. my friend said it sounds like a slight backfire after deceleration.
hope this helps
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Location:
Brisbane
Registered:
May 2002
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Re: Pinging noise?
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Sun, 28 November 2004 12:02
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Hmmm the plot thickens... you adjusted the timing and now it backfires? Sounds like you screwed up the timing, get someone to check it for you!
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Registered:
October 2004
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Re: Pinging noise?
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Sun, 28 November 2004 12:21
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ok Norbie...thanks i'll get someone to look at it for me a.s.a.p and hopehully see if thats the cause of the problem
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Location:
alice springs
Registered:
November 2004
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Re: Pinging noise?
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Sun, 28 November 2004 12:23
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mate if it is wasn't doing it before you did the timing then you have done something wrong. why did you change it anyway? 
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Registered:
October 2004
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Re: Pinging noise?
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Sun, 28 November 2004 12:52
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in reply to tojo: good point, i wouldn't touch it if i didn't believe it was broken to begin with... the noise has lessoned from a louder rattling on idle(noise used to come and go) after i tampered with it so it seems i haven't worsened the problem.
I appreciate all input so thanks for your post tojo
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