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Old 07-23-2002, 17:55   #1 (permalink)
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confused Exhaust rattle or noisy lifters - same sound???

Hi all,

Last night I took the XF back to the exhaust place that recently fitted my extractors and 2-1/4 inch system, because it has started making a loud, metallic, tinny, rattly, vibrating sort of noise at around 1000rpm when the auto is in "drive" and I'm accelerating gently. If I hold the brakes on and push the accelerator just a bit I can keep the noise going for a while and it definitely sounds to me like the exhaust is rattling itself to pieces, like a flange connection is loose or a heat shield is hitting against it or something.

The guy said it was noisy lifters, can you believe it? The engine was rebuilt in about Feb 99, so I reckon he's trying to do me over. Does anyone out there think that noisy lifters could sound like an exhaust rattle? If it *is* lifters, then I guess I'm up for big bucks to fix it. It's probably worth doing the cam at the same time.

I'm going to get a second opinion on the weekend.
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Old 07-23-2002, 18:31   #2 (permalink)
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My Pacemakers do make a tinny sort of ticking sound, and have done since installed, I think I recall someone mentioning that it enhances the sound of the lifters or something..

If you can try and get under the car whilst the engine is running to better diagnose the sound and where it is coming from.

When my exhaust was first fitted there was one bend which was slightly fouling and causeing a rattle at certain rpm...to fix it I just changed the angle of that mounting loop to give it less tension
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Old 07-23-2002, 18:42   #3 (permalink)
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With lifters you will hear a tick tick tick noise at Idle.
It is not hard to miss. When they rebuilt the engine did they replace the cam or use the old one that was in the engine?
If the cam was not replaced or lifters, if they were not lubbed correctly then Lifters could be the problem.


When I had my XF with Headers and 2 1/4 inch system I could hear the sound of lifters over the exhaust.
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Old 07-23-2002, 18:55   #4 (permalink)
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I think I know the lifter sound you're talking about guys, it's more obvious when the engine is cold. Sort of like a tapping sound which goes away when the engine warms up.

But this is a rattle like no rattle you've ever heard before. You wouldn't suspect anything but the exhaust IMO. If the drivers door is open it seems to come from under the car at my side. I'll be sticking my head underneath and getting the missus to rev it up for me just to make sure. Haven't had a minute to scratch myself lately.

Not sure if the cam was replaced or what else when the engine was rebuilt, I was young and stupid back then (younger and stupider than now anyway).

I've been looking at new cars lately, so I should just trade it in and hope they don't notice it.
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Old 07-23-2002, 18:56   #5 (permalink)
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That was my 100th post!
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Old 07-23-2002, 19:28   #6 (permalink)
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Whereabouts in melbourne are you???
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Old 07-25-2002, 07:42   #7 (permalink)
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how long after startup does the noise dissapear?

If its only from cold start and it dissappears a couple of minutes later, it will be slight piston clearance issue.
Nothing to worry about if this is the case.
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