Re: Is this a mechanical noise or detonation/knock ? - Saab 900 Bulletin Board - Saabnet.com
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I'm sorry if I continue to be a hag about this, but if the distributor servo can doesn't retard when pressure from the intake manifold is applied to it, then you are going to get knock.
What I do is at idle for example just apply a 6 - 10 psi regulated pressure to port on the servo can and watch to see the timing pulled out say about 10 degrees. Or, with the dizzy cap off, you might be able to see the arm on the servo can move when the diaphram is under pressure.
If you can see the tops of the pistons with a scope, make sure there isn't a carbon buildup as the red hot carbon will cause detonation. A couple of cans of Techron concentrate ( in other words, a couple treated tankfuls ) will spank the carbon off the pistonolas.
Posts in this Thread:
- high rpm engine clatter (revisited), Or.saab, Thu, 29 Oct 2015 21:48:13
- Fixed!, Or.saab, Tue, 3 Nov 2015 21:06:43
- Is this a mechanical noise or detonation/knock ?, BobD, Mon, 2 Nov 2015 13:30:46
- Location of noise?, SwedeFreak, Sat, 31 Oct 2015 19:38:23
- Re: high rpm engine clatter (revisited), Or.saab, Sat, 31 Oct 2015 13:39:33
- clatter update, Or.saab, Fri, 30 Oct 2015 13:52:10
- Re: high rpm engine clatter (revisited), turbocon86, Fri, 30 Oct 2015 06:19:57
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