Does anyone know how to adjust the fuel mixture on a turbo 940?

Hi jayeye940wagon,

You can adjust the fuel to air ratio, with chips and tricks and things. Yet usually to dump more fuel in the engine.

A Turbo will use a slightly richer fuel to air ratio, certainly during Turbo boost, so optimal running conditions for perfromance and slightly less so, fuel economy.

Do you know what version engine control system (Bosch fuel injection and ignition) is equipped on your 1991 Volvo 940 Turbo?

Find one of these on your North American driver side strut tower?



See here:
https://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm

You may want to read through the Volvo 700-900 FAQ.

Your 1991 Volvo 940 Turbo does not have Bendix Rex / Regina or Motronic. Though the different engine control (or management) systems share the same fault code schema. Socket 2 for fuel injection fault codes and socket six for ignition fault code.

Though the correct Bosch oxygen sensor will help.

Do you see the CHECK ENGINE dash light indicator on your dash display?

https://www.brickboard.com/FAQ/700-900/



The FAQ article about engine tunr and performance, with some passing notion as to fuel economy.

https://www.brickboard.com/FAQ/700-900/EnginePerformanceSymptoms.htm

Questions?

Hope that halps yoo-hoo-hoo-hoo.

Earl Grey Tea MacDuffed


--
Give your brickboard.com a big thumbs up! Way up! - Roger Ebert.

What is your MPG?
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Will I buy another Volvo??? We'll see....

around 22 combined hwy/city

My 89 740 got 34 mpg,after I flushed & fixed all the brakes,,I dont see whya similar 940 wouldnt get the same,,,

What type of driving? Is that highway, city or all around mileage?

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Will I buy another Volvo??? We'll see....

I drive fast, but lately I've been taking it slow outta the hole, and it's made a noticeable difference on th MPG. Combined hwy/city it's around 22, which I think sucks for a 4-cylilnder. Would I buy another Volvo? Absolutely. I wish they made a pick-up.

Yeah, 22 mpg isn’t great but that is what Blindboy gets and is line with what I’ve heard about automatic 940’s, 740’s and 240’s. I remember that my NA 240 got about 25-26 mpg highway w/o a turbo so it wasn’t much better than your 940 with turbo. Try to keep your foot out of the turbo by going light on the gas. Hey, these are heavy cars with small engines that have to work hard and they have all the aerodynamics of your kitchen refrigerator...:)


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Will I buy another Volvo??? We'll see....

Common misconception but Volvo are NOT heavy cars, they weigh between 2800-3200lbs for the 740/940 line and that is pretty light comparatively speaking but they feel heavy, or solid, if you like. Many would say they are underpowered by today's standards, but what the hell, I still love them!

my 93 is about 22mpg But I think The oxy sensor is the wrong 1 .So ill check again when I get my new 1 from FCP..

Dear jayeye940wagon,

Hope you're well. The Engine Control Module adjusts the fuel/air mixture, based on signals from the air mass meter, engine coolant temperature sensor, etc.

So far as I know, there's no way to do this manually.

Hope this helps.

Yours faithfully,

Spook

crap

Dear jayeye940wagon,

Hope you're well. Does your response signify acceptance of my conclusion or rejection of it?

Yours faithfully,

Spook