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PostPosted: Mon Aug 26, 2019 9:12 pm 
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Joined: Mon May 13, 2013 8:34 pm
Posts: 45
Car Model: Saab 99 Turbo
Hi All,

Just looking for some advice/knowledge on getting my timing right, after a recent rebuild I've been running the engine in, timing was setup with a timing light as specified in the manual, distro vacuum tested using timing light at the same time and appeared to be working.

What developed only on a hot engine and not a cold one was a knocking at revs increasing from 1000 to 2000 and then would stop when increased, after worrying about knocking bearings, a slight tweak in advancing the ignition got rid of the knocking and so suspected pre-detonation. Before this tweak the plug colour was a healthy tan/black, since the adjustment the plugs have gone to white tips and black surround so something no quite right with the timing and/or fuel, I've been gradually increasing the fuel in increments and running has improved but in 3rd gear it tends to hunt, more so if your quicker on the accelerator but 1/2/4 gears it runs well.

I'm wondering if the distro vacuum isn't working correctly, also mine is a 79t so has a small vacuum pot on it but I have seen the later ones with a big pot on and wondered if there was a reason for this? I've got one in the spares so was thinking about trying it out.

Any insight appreciated, thanks in advance


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PostPosted: Mon Aug 26, 2019 9:24 pm 
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Joined: Tue Aug 04, 2015 12:18 am
Posts: 35
Location: Scotland
Car Model: 900
Have you sooked on vac pipe to see if unit intact?


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PostPosted: Tue Aug 27, 2019 12:19 pm 
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Joined: Mon May 13, 2013 8:34 pm
Posts: 45
Car Model: Saab 99 Turbo
Yes tested the vac pipe that way and also with a timing light...


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