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Ticking sound

I noticed that my 930 has a ticking sound coming from the engine. It can be under partial or full throttle, low boost and no boost, hot or cold. Its pretty noticeable when the windows are up and under partial throttle. I'll be accelerating and can hear it, then I let off the throttle and it seems like it goes away. I'm thinking either a valve or injector but I'm probably wrong. lol...

Car is an 84 930 The best fuel i can get out here in New Mexico is 90 octane but the elevation is around 4000ft, and i try to run .7 bar and under so I dont think its detonation but any help would be appreciated. Thanks in advance.

Jonathon
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1984 930... Andial intercooler, GT35R, Zork tube, RarlyL8 wastegate pipe

Last edited by AFD660; 05-16-2010 at 12:53 PM..
Old 05-16-2010, 12:31 PM
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Check this out:
Bye Bye Clicking Sound..A Slow'N'Rusty Pictorial - BOV Housing
Old 05-16-2010, 12:46 PM
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Thanks for the link but its not a clicking sound or anything like how its described in the first post of the article.
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1984 930... Andial intercooler, GT35R, Zork tube, RarlyL8 wastegate pipe
Old 05-16-2010, 04:25 PM
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Is it a "metallic" clicking? Does it speed up with the engine RPM too? If so, it sounds like excessive valve lash and easily fixed. It could also be an exhaust leak in the primaries if it doesn't sounds metallic - do you have headers?
Old 05-16-2010, 04:36 PM
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DonE
yeah sounds like a metallic ticking sound that speeds up with the RPM.. and goes away or gets real quiet when idling or off throttle. so probably valve lash???
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1984 930... Andial intercooler, GT35R, Zork tube, RarlyL8 wastegate pipe
Old 05-17-2010, 07:52 AM
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Valve noise shouldn't go away when you let off the gas. The ticking also should be more pronounced when the engine is warm vs cold.
An small exhaust leak is more pronounced when on the gas and usually louder when the engine is cold.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8

Last edited by RarlyL8; 05-17-2010 at 11:28 AM.. Reason: typo
Old 05-17-2010, 08:56 AM
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When I bought my car one exhaust port gasket leaked and it made a tick like sound as you're describing.
The one cylinder exhaust tick was louder when the motor was cold and went away somewhat as the motor warmed up and metal parts expanded.

The threads for one 8mm exhaust port stud were stripped or pulled.
I timeserted it, problem fixed.
Old 05-17-2010, 11:11 AM
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If you are careful you can take a long dowel or screw driver and rest it against different parts of the motor and hear where it might be coming from. Just rest it against different parts of the motor like the intake manifold, valve cover, cooling fan housing... and press the other end againstt your ear.

Of course a stethoscope would be better and be careful of moving parts like the fan, belt, compressor...

Should help you narrow it down. It is kind of fun to do and you will be supprized how well you can hear inside the motor.
Old 05-17-2010, 11:36 AM
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and a hose around 4' long so you can lay on the ground with one end in your ear and probe the other end around the exhaust ports and header flanges listening while it's running.
Old 05-17-2010, 12:47 PM
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I like!
Old 05-17-2010, 01:50 PM
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Thanks guys.. i'll try the hose and screwdriver thing... and hopefully narrow it down to something simple...just bought a crap load of valvoline VR1 at autozone and have other maintenance things to do on girl.. lol.. thanks for the tips guys..
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1984 930... Andial intercooler, GT35R, Zork tube, RarlyL8 wastegate pipe
Old 05-17-2010, 04:01 PM
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Wo ist die Rennstrecke?
 
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If you are a DIY owner, do yourself a favor and buy a mechanic's stethoscope. You'll like how you can tell exactly which valve rocker is out of spec or if there is noise in the cam chain box and so on. Worth the investment.

And you are dead-on - look for the simplest fix first.
Old 05-17-2010, 06:45 PM
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