constant valve lifter noise ok?
#1
constant valve lifter noise ok?
Hi all, I'm a long time lurker with a high mileage (85K) '99 996 that has recently developed a pretty noticeable engine tick that actually seems to get a little louder when the engine gets warm, and it doesn't go away. The car runs fine and pulls great. My trusted independent mechanic says no worries, it's just lifter noise which isn't a problem. Just want to get your opinions, should I believe him or am I in for a new engine soon? thnx in advance.
#3
not sure, anyway I would be able to tell if it is myself? and if
it is the EGR, should I be worried? the ticking is constant, not rapid at idle but gets more rapid up and down with acceleration and deceleration. Thanks
#4
Race Car
That is normal opertation for the EGR valve. Not to worry. So much for trusting your mechanic. Glad he didn't suggest tearing apart the engine to install new lifters....only to have the noise continue after he was done.
#7
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Porsche tech says it could be a debri in the hydraulic lifters that partialy blocking full flow of the hyd fluid to properly lift the valves.
Trending Topics
#9
Rennlist Member
I know on the 993 that this is not uncommon and due to a partially collapsed lifter. If it is a lifter and it is always noisy, then replacement is the only fix. Everything else is just a band-aid that falls off.
Does anyone else know if the 996 has had a history of failing lifters?
Marv
Does anyone else know if the 996 has had a history of failing lifters?
Marv
#11
Race Car
Originally Posted by turambar
Is this a serious issue? Do you guys think I need to take care of it asap, or can I wait a bit?
thanks
thanks
#12
Three Wheelin'
Join Date: Jan 2005
Location: Portland, Oregon
Posts: 1,348
Likes: 0
Received 0 Likes
on
0 Posts
Is the EGR system located where you can get at it with the engine running? If it is, you can use a long socket extension as a stethoscope. Compare the noise there to the noise at the valve cover (or use a real stethoscope). You should be able to localize the noise.
#13
Race Car
Originally Posted by leedav
Is the EGR system located where you can get at it with the engine running? If it is, you can use a long socket extension as a stethoscope. Compare the noise there to the noise at the valve cover (or use a real stethoscope). You should be able to localize the noise.
#15
Race Car
Originally Posted by turambar
1999porsche911, would you be able to tell me where the connector is located at in the bay? Thanks again for all your assistance.
When you hear the ticking sound from your engine, stop, open the trunk, disconnect the valve connector (with engine running). If the ticking stops, you have found the noise maker.