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Mixture

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

1975 - 1993 240
1983 - 1992 740
1982 - 1991 760
1986 - 1991 780
1990 - 1998 940
1990 - 1998 960
1997 - 1998 V90/S90

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1990Volvo740
Posts: 18
Joined: 10 August 2024
Year and Model: 1990 Volvo 740 GL NT
Location: Seattle
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Mixture

Post by 1990Volvo740 »

Someone have a diagram for the location of the Air Fuel mixture screw?

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volvolugnut
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Year and Model: 2001 V70
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Post by volvolugnut »

It is the plastic knob in a plastic valve body on the front of the throttle body. If you plan to adjust it, mark it so you can return to the original setting if you find you have made things worse.
You may just have a vacuum leak somewhere.
Paper manuals for 240 (very similar to 740) Volvos used to be common in bookstores.
volvolugnut
The Fleet:
Volvo: 2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple Volvo parts cars.
Mercedes: 2001 E320, 1973 280, 1974 280C, 1989 300E, 1988 300TE, 1979 300TD, parts cars.
2009 Smart Passion
Ford: 1977 F350, 1964 F150 (2), 1938 Tudor Sedan
Farmall tractors: 1956 400 Diesel, 1946 A
And others.

1990Volvo740
Posts: 18
Joined: 10 August 2024
Year and Model: 1990 Volvo 740 GL NT
Location: Seattle
Been thanked: 1 time

Post by 1990Volvo740 »

volvolugnut wrote: 16 Aug 2024, 17:13 It is the plastic knob in a plastic valve body on the front of the throttle body. If you plan to adjust it, mark it so you can return to the original setting if you find you have made things worse.
You may just have a vacuum leak somewhere.
Paper manuals for 240 (very similar to 740) Volvos used to be common in bookstores.
volvolugnut
There's nothing there.
HS 04.jpg
HS 05.jpg

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volvolugnut
Posts: 6233
Joined: 19 January 2014
Year and Model: 2001 V70
Location: Oklahoma USA
Has thanked: 927 times
Been thanked: 1000 times

Post by volvolugnut »

Yes, no knob there. 740 is different. I will try to find something about A/F adjustment.


Turbobricks forum posting:
https://turbobricks.com/index.php?threa ... ix.375543/
No pictures, but discussion and note that there is no adjustment possible.

volvolugnut
The Fleet:
Volvo: 2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple Volvo parts cars.
Mercedes: 2001 E320, 1973 280, 1974 280C, 1989 300E, 1988 300TE, 1979 300TD, parts cars.
2009 Smart Passion
Ford: 1977 F350, 1964 F150 (2), 1938 Tudor Sedan
Farmall tractors: 1956 400 Diesel, 1946 A
And others.

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