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1990Volvo740
Posts: 18
Joined: 10 Aug 2024, 15:10
Year and Model: 1990 Volvo 740 GL NT
Location: Seattle
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Post by 1990Volvo740 »

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

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volvolugnut
Posts: 6501
Joined: 19 Jan 2014, 09:51
Year and Model: 2001 V70
Location: Oklahoma USA
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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
John Deere 214 lawn tractor about 1977 model
And others.

1990Volvo740
Posts: 18
Joined: 10 Aug 2024, 15:10
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: 6501
Joined: 19 Jan 2014, 09:51
Year and Model: 2001 V70
Location: Oklahoma USA
Has thanked: 987 times
Been thanked: 1075 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
John Deere 214 lawn tractor about 1977 model
And others.

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