Stock 1993 940T = 16mpg. combined highway/street driving with a light foot .OMG Don't stop I'm almost there!

[Jack]

Ac on all the time ?

 

[OttoB]

I've been driving LH cars over 20 years. One fuel pump, two CPS. One AMM. Couple lambdas.

But all issues with fuel consumption and driveability are caused by exhaust intake leaks and FPR (four I guess. I bought a new one from Rockauto.)

 

[alschnertz]

I get it that these got poor mpg.
But this same car getting 16mpg 5 years ago instead of the 19-20mpg I used to get, is a 20% loss.

Been no mention of the fuel you're using. Has that changed in CA over the past 5 years?
We have to use 10% ethanol in CT at typical pumps. Yes, you can find pure (100%) gasoline at marinas, but you wouldn't want to fill a car there as a daily driver.
There are no alternatives because our legislators know it's up to us to use 10% to clean the air that drifts over our state.

I notice a 15%+/- increase in fuel consumption when using 10% ethanol compared to straight gasoline.
I also drive like a grandpa/grandma.

 

[Pietercc]

Ac on all the time ?

This was my thought, your radiator fan may be on because of the AC. If the ecu is seeing that it is not up to temp due to 171 thermostat it may be running richer. Check your injectors and FPR (sorry if already said, didn't read all comments yet)

 

[Khrrck]

Been no mention of the fuel you're using. Has that changed in CA over the past 5 years?

CA gas has had ethanol in it for ages. I don't think they've changed anything lately.

Generally it's quite hard to pin a small mileage decrease on a single cause unless you have a really well controlled environment. 10% ethanol gas has about 2% less energy per gallon than pure gasoline.

 

[Jack]

Crank up the psi in your tires

 

[240 240]

Crank up the psi in your tires

i had them 30-32psi. I just filled all 4 to 35psi

 

[240 240]

Ac on all the time ?

yes

 

[240 240]

This was my thought, your radiator fan may be on because of the AC. If the ecu is seeing that it is not up to temp due to 171 thermostat it may be running richer. Check your injectors and FPR (sorry if already said, didn't read all comments yet)

this could be an issue.
I had an oem 92* tstat on this car before.

I typically run the tropical Tstat but that was almost always on kjets or 2.2. The temp gauge in the middle of the day is pegged in the same spot.

 

[Khrrck]

I could have sworn we had a thread mentioning mpg and thermostat recently but I only can find this one from 2009.

240 - Need Help Choosing a Thermostat

They are sold in degrees of 71, 82, 87 and 92. I guess when the engine coolant temperatures reach one of those degrees the thermostat opens up and allows the coolest to flow correct? So which one should I get for my 240 B230ft? I guess 71 would be the best since I live in the hot south and it...

turbobricks.com

 

[philski o'flood]

toyotza

 

[bgpzfm142]

<dumb thought>

Your speedo is working okay, so it's sending a VSS to the ECU and cutting off injection on the throttle over-run?

</dumb thought>

 

[shoestring]

Been no mention of the fuel you're using. Has that changed in CA over the past 5 years?
We have to use 10% ethanol in CT at typical pumps. Yes, you can find pure (100%) gasoline at marinas, but you wouldn't want to fill a car there as a daily driver.
There are no alternatives because our legislators know it's up to us to use 10% to clean the air that drifts over our state.

This is from the DoE website:

Ethanol has a higher octane number than gasoline, providing premium blending properties. Minimum octane number requirements for gasoline prevent engine knocking and ensure drivability. Lower-octane gasoline is blended with 10% ethanol to attain the standard 87 octane.

Ethanol blended in gasoline at 10% is because it's a cheap octane additive, not because of emissions.

 

[2manyturbos]

Check your brake pads for uneven wear. You may have a sticking caliper piston causing constant drag. I've replaced quite a few calipers in the last few years for this reason.

 

[240 240]

Check your brake pads for uneven wear. You may have a sticking caliper piston causing constant drag. I've replaced quite a few calipers in the last few years for this reason.

bled all the brakes 2 weeks ago. no glaze on the disks.
but i didn't repack wheel bearing grease. I should check that.

 

[2manyturbos]

bled all the brakes 2 weeks ago. no glaze on the disks.
but i didn't repack wheel bearing grease. I should check that.

You can't, so, don't bother wasting your time. The 7-9 series cars run sealed bearings like a front wheel drive car runs.

 

[fatcatbestcat]

I'll sell you a 940T guaranteed to get 26 mpg under specific circumstances.

 

[240 240]

well I guess that explains why I can't ever remember greasing bearings on these cars

 

[240 240]

I'll sell you a 940T guaranteed to get 26 mpg under specific circumstances.

i don't want another one. Fuck these turbo cars. 108hp 240 I can fix everything in a weekend with spare couch change.

 

[conehead]

My 940 turbo got 23/24 at best. I heard something about diesel oil potentially clogging up the catalytic converter, but that's just me hearing something, no science whatsoever. I'd be checking my calipers, as someone mentioned above, and also check the cat to make sure it's not full of carbon deposits and what not, regardless of the diesel oil it could still be full of garbage.