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Knocking on Startup

Carl-Fl

By Carl-Fl
in 986 Series (Boxster, Boxster S)

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Carl-Fl Member

Carl-Fl

Posted
Posted

Okay, today's newest adventure. My boxcar had been siting two days and when I started it up this morning(52 deg) it had a slight knocking or ticking sound for the first two minutes then stopped. It sounded like lifter noise from an old V8! The idle was a little rough but cleaned up when sound ceased. I walked around the car to try and isolated the area but then it got quieter.

Any ideas? Sound familiar? By the way car is 99 2.5 w/21,000 miles, and no CEL on.

Thanx in advance for any suggestions

Carl

  • Admin
Loren Member

Loren

Posted
  • Admin
Posted

So that we don't have to adjust the valves every 6,000 miles anymore Porsche installed hydraulic lifters in all their cars. So, if you let the car set for a a few days the oil drains out of the lifters and they clatter at start-up. As the engine warms (and the oil gets back into the lifters) the noise goes away. Completely normal.

Carl-Fl Member

Carl-Fl

Posted
  • Author
Posted

Thanx Loren. My original thought was days gone bye with an old hydraulic lifter problem of dirt or contaminet. I didn't realize the Boxster used them. My 911 has solids and requires my attention more frequently.

Carl

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