Porsche 911UK Forum

Welcome to the @Porsche911UK website. Register a free account today to become a member! Sign up is quick and easy, then you can view, participate in topics and posts across the site that covers all things Porsche.

Already registered and looking to recovery your account, select 'login in' and then the 'forget your password' option.

993 cab - engine noise

roja

Well-known member
Joined
13 Jan 2006
Messages
152
can anyone help?? .. i have owned my '97 993 cab for just under a year and have had a tapping noise coming from the engine under revs since day 1. I asked the head service tech at porsche about it and he said its nothing to worry about and that some cars jsut sound that way!... i also asked my father in-law who has owned over a dozen various 911's and he said that 911's are known to sound like a "marble in a tin can"!! (is this right)??... i was just coming to terms with the fact that this is how it should sound then last week for about 3 days the tapping sound disapearred and the engine sounded sweet!!! .. Anyone have any ideas as to where the sound is coming from?? or how i can get rid?? .. any help would be appreciated!!

Migration info. Legacy thread was 58861
 
Post the question on Rennlist.com forum 993 section (subscription) and you'll get a larger number of replies from owners who have lots of experience taking this engine apart.

A search of Rennlist has pointed to pre-ignition - pinking - low octane fuel can cause it or in addition the collapse of a rubber tube in the advance retard air line.

"Hi jason,
FWIW, pinging, to me, sounds like marbles being rattled around in a metal can that has been wrapped in a blanket. Is that similar to the sound you're hearing?

I had exactly the same problem, for me, what solved it was the adaption of a small y-cord splitter that lives on the left hand side of the varioram induction tucked back in there. This spiltter collapses with time and effects advance/retard, causing the pinging/knocking /rattling under load. You can effect a repair with a small piece of 8mm brass tubing, there is a thread on this very problem on the board somewhere, perhaps some clever johnny can direct you to it, it certainly solved this very annoying problem for me.

Ash"

/images/migration/UploadedForumImages/vacuum%20thingy.jpg

Migration info. Legacy thread was 58866
 
Thanks Stevo...

its been driving me crazy... Hopefully this might be the problem... but will have a look at the rennlist forum also!!

cheers

Roja


Migration info. Legacy thread was 58868
 
The reason it disappeared might have been better octane fuel - try topping up with Shell Optimax (98 octane) or similar - the highest rated you can get of any brand would do.

Migration info. Legacy thread was 58869
 
yeah Stevo ..I only use 98 octane..(shell preferably but sometimes caltex premium)have done since day 1... its just started to get a bit cooler here (aus) in the last couple of weeks and i thought it might be the temp...but alas the irritating sound is back (along with the cold weather)!!

Migration info. Legacy thread was 58873
 

New Threads

Forum statistics

Threads
124,055
Messages
1,436,750
Members
48,448
Latest member
blueteddybear
Back
Top