Guys, I have been encountering some small backfiring issue with my 996tt (2002 tip) and the chief mechanic of the authorised dealer said it is the sticky hydraulic tappets which caused the backfiring. Accordingly, I have taken my car to them to have the tappets changed. My car has been with them for almost 2 weeks and yesterday I was told that my car is now encountering some engine compression loss (probably something is leaking after the change of the tappets). I mean how could this happen? Is this poor workmanship or not?

Actually I would like to ask you guys (i) is it reasonable to take 2 weeks to change the tappets? (ii) what can cause the engine compression leak in this situation? Thanks in advance.

 

No it shouldnt take 2 weeks, but with Porsche having basicaly nothing in stock besides oil filters that wouldnt supriseme.

Cylinder head leakage is usually caused by improper valve opening/closing or piston rings having excessive wear, I dount its the latter. Now being they are a Porsche dealer their tech should know that the engine has to run for awhile in order for the tappets/lifters to build up oil pressure. Is the engine still backfiring still?

 

BBGT2, thanks for your quick response. Actually I haven't yet get my car back so I dont know if the backfiring is still there. They have only given me a call saying that they need more time to figure out the compression leak problem. Do you think this compression leak issue is major?

 

Ask them what percentage are they talking about as far as "leaking", and what they are saying will fix it. I am sure someone else will respond with better answers in time this board is very helpful.