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 Cold starting issues.
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72sonett3
V4 Fanatic

Spain
246 Posts

Posted - 09 Apr 2019 :  10:28:21 Show Profile Reply with Quote
You have a Weber 32/36 DG*V carb? What is the jetting?
It has one mixture adjustment screw (to set CO at idle) and 2 idle jets, see e.g. https://www.saabforum.nl/viewtopic.php?f=47&t=69790&p=807037#p807037.

If you have a compressor, blow out the idle jets with compressed air.

Ignition should be at 6 deg BTDC.

This is what I have in my Sonett (1700):


--
'72 97
'77 96L conv.
'79 96GL (LPG)
'83 900i (LPG)
'95 900SE conv.
'99 9-3T

Edited by - 72sonett3 on 13 Apr 2019 19:18:30
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andydeans3
V4 Guru

United Kingdom
1174 Posts

Posted - 13 Apr 2019 :  15:04:32 Show Profile Reply with Quote
72Sonett3.

Not sure without going to take the Carb apart, but I took advice from this and the UKSAABS forum at the time, and was told to ask Fast Road Cars, to jet it as for a 1600 Cortina. Which I duly did.

As a follow on. Having got my MGB Roadster on the road, with its' first free tax disc, (Yipee) on the 1st of April, I've not been using the SAAB this last 10 days or so. When I went to start it yesterday. Same story. No way to start it. Plenty of winding going on, so I don't think it was fuel draining back from the carb. However, as soon as I sprayed some "Cold Start" on the air filter, Off she went first turn. A bit "stuttery" to begin with, but then ran fine.
Must be a "fuel" problem!
Hoping to sell the MGB, so need to get this sorted out!


1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro
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GeoffC
V4 Fanatic

United Kingdom
408 Posts

Posted - 13 Apr 2019 :  16:06:54 Show Profile Reply with Quote
Presumably as it runs ok normally the jetting is correct. Hope so as I ordered
the same from Fast Road Cars but haven't fitted the carb yet. I think an electric fuel pump would help your mechanical one may be struggling to pull fuel through when it has been standing.
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melle
V4 Guru

United Kingdom
2747 Posts

Posted - 13 Apr 2019 :  18:26:33 Show Profile Visit melle's Homepage Reply with Quote
quote:
Originally posted by andydeans3
[...] as soon as I sprayed some "Cold Start" on the air filter, Off she went first turn. A bit "stuttery" to begin with, but then ran fine.
Must be a "fuel" problem!
This is a common and persistent misconception. I think I explained it in your thread on the other forum.

Since this is a "new" issue, I wouldn't suspect the jetting. Fix the timing first (check the dizzy clamp is tight) and then start fault finding as suggested earlier. Happy to lend a hand if you haven't fixed it by Swedish Day.

www.saabv4.com
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andydeans3
V4 Guru

United Kingdom
1174 Posts

Posted - 13 Apr 2019 :  20:36:10 Show Profile Reply with Quote
Yep, I'm going to re-set the timing, and if it still doesn't fix it, we can have a "fiddle" on Swedish Day!

1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro
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