Update:
I rebuilt the rear brake calipers last weekend as they were seizing as mentioned earlier in the thread. Both calipers are now moving freely. This made a slight improvement to MPG as expected but nothing major. The front brakes are fine.
The car also had an MOT this week. It passed with no advisories and the emissions tests were good. Here are the results from the print-out:
Fast Idle Test
Engine Speed: 2500-3000 RPM
CO: 0.00%
HC: 1ppm
Lambda: 1.01
Natural Idle Test
Engine Speed: 450-1500rpm
CO: 0.00%
According to this, the engine is running well in my view. I would assume this rules out any engine problems causing my low MPG (unless the problems only happen under load?). If cam timing was out, I think it would show up on the emission test.
If it's not the engine and it's not the brakes I'm not sure where to look next! The transmission module also shows no error codes.
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- 2005 Audi A8 D3 4.2L Petrol
- 2008 Ford Mondeo 2.5T
- 2000 Ford Focus 1.6
Last edited by MatthewH; 21st January 2017 at 01:12 PM.
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