fuel econ & cold weather

Lee666 · Post by **Lee666** » Thu Dec 08, 2005 11:26 am

Ever since the weather has turned really cold my fuel economy has been complete shite, sitting in idle(around 950-1000rpm) is beyond a joke, even got out at one point to check for a leak!!!
Any ideas?

robin_xr4i · Post by **robin_xr4i** » Thu Dec 08, 2005 2:17 pm

When the engine is cold it generally needs more fuel so the ECU will do this, when the engine is warmed up a sensor tell the ecu it reached operating temp and it will adjust the fueling.

Well thats what happens on my XR3i. The sensor was bust and it messed up the fueling!!!!

So i guess the same thing might be happening on your 480?

JohnTurbo · Post by **JohnTurbo** » Thu Dec 08, 2005 3:16 pm

I drove home last night...70 miles. Fuel use was bang on normal. Perfomance was up...2degrees and light fog were obviously working wonders on my IC.

catgroom · Post by **catgroom** » Fri Dec 09, 2005 3:01 pm

Yep my Turbo has been going miles better today on same fuel,same load.

Overtaking on boost has been much more ermmm,brisk shall we say!

Nice one Rich!

By the way,at this time of year,we also get more fuel in our tanks because less evaporates between the petrol pump and the car on delivery.Added to which,the air is more densus!Haha!

suddy · Post by **suddy** » Fri Dec 09, 2005 7:55 pm

when the engine is cold, fuel economy is about 30, once it warms up though its more like 35.

on a long run, say to hungary for example, its more like 40

i wouldnt worry about it.

Murf · Post by **Murf** » Fri Dec 09, 2005 9:16 pm

i miss the cold weather boost fun, My MR2 has an inlet air temp sensor and the eco cuts the boost by 3 psi when the weather is cold, apparently so you get the same power output regardless of the weather!
booooooring

VanDerGraaf · Post by **VanDerGraaf** » Fri Dec 09, 2005 11:28 pm

Disable that feature immediately!

robin_xr4i · Post by **robin_xr4i** » Sat Dec 10, 2005 10:51 am

Cold dense air make the 480 feel sooooooooo much more responsive.

Murf · Post by **Murf** » Sat Dec 10, 2005 12:21 pm

Disable that feature immediately!

yeah, you just unplug a wee pipe but that also disables the boost gauge and fuel cut and all the other ecu safey features

i dont wanna be pushing it in the cold anyway, i had it fully sideways this morning leaving braehead car park, i wasnt pushing it and it wasnt even on boost, it can be a bit scary sometimes!

VanDerGraaf · Post by **VanDerGraaf** » Sat Dec 10, 2005 1:44 pm

I knew you couldn't resist getting it on the road, winter or not!

SanPhire · Post by **SanPhire** » Mon Dec 19, 2005 3:18 pm

Yup - I get the same - Greta idles around 950-1100 as she warms the engine up (usually for the first 5mins of the drive or the engine water temp stops reading "COLD") and guzzles 98RON like Ulrika Johnson downs pints, but then settles down to her standard levels of frugality... and enjoys the cold air purring through the Pipercross which deminishes her standard levels of frugality