poor fuel economy

[Gez08]

my fuel economy isnt the best and my car holds back when cold, is this a sign of the lambda on its way out? i have no lights on the dash, n once warm runs fine, just not sure on fuel economy.

 

[pete_clio]

whats poor MPG on your car?

 

[Gez08]

havnt wrked it out, but seems to go down fairly quickly even with low speed driving

 

[DrR]

Miles per tank?

 

[D4N13L]

i think most 172's are a bit s**t on first start up

 

[Wobba]

Have you checked the fuel lines? Get the car started so the fuel system is pressurised and have a really good check over, tracking the fuel feed, and the return hose from tank to filter to engine.

I was running about 19 mpg in the Williams until this weekend when I one of my lines finally gave up the ghost and spewed fuel all down the motorway. We replaced both the lines with some spare braided fuel lines I had in a lay-by (in the snow and dark) and my economy has never been better.

Lamda sensor is always a culprit of several problems like economy, emissions and idle, so yea it could be that too.

General poor car maintenance and sticking brakes can also be a cause.