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 Weak mixture on one bank, Weber 32/36 DGV
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andydeans3
V4 Guru

United Kingdom
1550 Posts

Posted - 14 Sep 2021 :  19:54:38 Show Profile Reply with Quote
quote:
Originally posted by melle
Really difficult to diagnose something like this from a distance, so I can only shoot ideas from the hip really. Does the no. 3 plug seat OK, and is there no damage to the threads or the seat in the head? HG leak, i.e., coolant leak to no. 3 cylinder? How's the coolant level and ave you recently done a compression test? When did you last adjust the valves? Does the thermostat open at all?

Melle
-Not a drop of water lost on this weekend's trip to Buxton, Stratford, Hatton park, and home.

- Compressions checked a few weeks ago. All around the 140 psi mark
- Tappets checked at the same time.
- As far as I'm aware the thermostat opens. I've just done a big journey over the weekend, and had no cooling/heating issues.

What I have done today, is fit new plugs.
I'll report back what they look like next week.

Andy

www.saabv4.com



1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro
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andydeans3
V4 Guru

United Kingdom
1550 Posts

Posted - 22 Sep 2021 :  14:05:34 Show Profile Reply with Quote
The 4 plugs are below, numbered 1 to 4, left to right.
I think there's more of a consistency now.
I checked the compression again today, with a different compression tester from before.
130 to 145 psi across all 4.

[url=https://flic.kr/p/2mt9UpL


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

United Kingdom
281 Posts

Posted - 27 Sep 2021 :  11:29:30 Show Profile Reply with Quote
The moral to all this is change the plugs if you have a plug problem, whatever, change them for what it doesn't cost, and compare! I have had occasional problems with NGK's over the years. Still reckon they are the best going for the money.
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