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Weird noise on startup

bala

By bala
in 986 Series (Boxster, Boxster S)

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bala Member

bala

Posted
Posted

My 2000 S 3.2 has been making weird noise on cold startup. This has been happening since I did the throttle body cleaning. It occurs only at cold starts and not when the engine is warmed up. It goes away in about half a minute. During this half minute car idle is pretty rough and then it smoothes out.

Below is the link to the audio file in m4a format. Windows media player or apple player would be able to play it.

The smoothing out in the audio file occurs around the 30th second.

https://docs.google.com/open?id=0BzNj15TtG1g_NjU0YTlmNzMtNmNkOC00MWM0LWJkO TEtNzIxNjhiZTE4NmMx

logray Member

logray

Posted
Posted

Sounds like some serious hesitation and misfires. There are also some mechanical noises to be concerned about. Is your check engine light flashing?

If the noise sounds like it's coming from inside the engine, any noises such as these should be taken very seriously, in fact it is a good reason not to drive the car but have it inspected (flat bedded somewhere), unless you feel troubleshooting the issue further.

If the noise is coming from external to the engine you need to identify where it is coming from, with the engine cover removed of course.

The engine should only be run as long as necessary to diagnose the issue.

I would first retrace your steps to make sure you put everything back together right.

I would also scan the car's computer for trouble codes.

Good luck!

bala Member

bala

Posted
  • Author
Posted

CEL was not flashing but steady for quite some time now. Durametric is reporting O2 failure. Ordered and waiting to replace. After I recorded this I replaced the spark plug tubes and the coil tubes. Took for a drive and car was very underpowered. Struggling a lot to go past 70. Disconnected the MAF and it ran like a Porsche. I might have used the wrong can to clean the MAF (thinking electronic cleaner instead of MAF). Anyway I think it's time to replace it. BTW, after the tubes replacement, this pop noises are not there anymore.

logray Member

logray

Posted
Posted

Good to hear, and there were no misfire codes?

Sounds like you might be back to normal once you sort the MAF and O2 sensors out.

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