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Knocking on Startup


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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

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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.

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