Question about 1999 Porsche Boxster

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There is this sound like a valve tappet or chain noise on my 98

Boxster , it isnot real loud or real scary but the dealer said not sure what it is but its not the timming chains, there has allways been a sound after it starts for a second or two, now its longer and louder. what could it be?

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  • 52 Answers

They have a problem with the oil pressure relief valve chattering from cold for a few minutes, a simple fix to change for a new modified item with shamfered edges on valve to eliminate noise

Posted on Sep 06, 2009

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Posted on Jan 02, 2017

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1 Answer

Can a valve tap in a 2004 Town Car be the tension on the timming chain?


B Mckenna, Timing chains can make noise, when you say the noise does go away sometimes, it sound more likely to be a valve lifter or tappet noise. You can pick up a mechanics stethoscope cheap and listen to the noise and hear/see if it is louder from the timing chain area or the valve covers to determine location.
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may be you should make a diagnostic and you can do it in a garage or you can do it by yourself if you want to do it by yourself you need some tools and you can find some good ones here: chinasinoy.com

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SOMETIMES IT IS CAUSED BY THE OIL USED! THE WAY YOU DESCRIBE IT SOUNDS NATURAL, BUT YOU MIGHT CHECK THE TAPPET ADJUSTMENT! ONE OR TWO MIGHT BE A FRACTION LOOSE! THIS IS EASY TO DO, BUT REQUIRES YOU TO REMOVE THE VALVE COVERS AND WIGGLE THE TAPPETS BY HAND! TOO MUCH FREE PLAY CAN CAUSE THEM TO MAKE NOISE! YOU CAN ADJUST THEM UP A LITTLE, BUT DON'T OVER TIGHTEN THEM, OR YOU CAN DAMAGE YOUR LIFTERS! CHECK YOUR LAST OIL CHANGE, AND IF NEEDED, YOU MIGHT CHANGE TO A HIGH MILEAGE SYNTHETIC OIL LIKE MOBILE ONE, IN A 10W-30! 10W-40 IS TOO THIN FOR THAT TYPE OF ENGINE!

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ur car uses hydrolic lifters instead of tappets but they sound the same when faulty. most likely a 'sticky' lifter. very expensive to change.

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?tappet noise on 2000 996 cab - on run off in 3rd or 4th


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Sep 10, 2009 | 1999 Porsche Boxster

1 Answer

Noisy startup when cold, sounds like valve


Hello onarock844...The Hyundai 2.4 litre and the 3.3 litre are known to have valve train noise. Some sooner than others.
The timing chain tensioners on the 06 and 07 Sonata 3.3 engines built before August 4, 2006 are well known for developing wear that allows them to make a tapping or rattling noise for a short time after a cold start. This noise can be mistaken for a lifter noise, although the actual source is in the front cover area of the engine. Hyundai has released a technical service bulletin on this problem, which describes installation of an updated design timing chain tensioner (part #24410-3C300) to correct this noise issue.
Ask your dealer to refer to Hyundai service bulletin #06-20-002 for information...If this has already been corrected,,,and the noise is coming from the upper engine area and not from the timing chain area, then the valve clearance will need to be adjusted. This is done by disassembling the valve train and installing slightly different size tappets to change clearance.
This is a fairly labor intensive process, so if you are still under factory warranty then you will want to go over the dealer's head and get the Hyundai zone rep involved to get it covered before your warranty coverage expires...
I recommend useing a full synthetic engine oil, i know in a few cases where the noise has stopped when the oil was changed over to synthenic, also a high quality filter is important, such as a purolator.
Good luck...i hope this helps...please rate me a fixya.

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1 Answer

Hydrolic Valve Lifters.(Vanos) Replacing


Hi

The lifters can be cleaned by getting the engine nice and hot and then adding an engine flush to the oil and leaving the engine running at a high tickover for about 15 to 20 minutes, and then giving the car an oil and filter change.

Are you sure its the tappets and not the timing chain?

Regards

Geordie

Jun 13, 2008 | 1997 BMW 328

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