All Things Mk5 > How to Guides / Troubleshooting

Extremely Poor MPG

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SkyJawa:
Thermostats......?

Itguy:

--- Quote from: SkyJawa on December 01, 2013, 12:16:13 am ---Thermostats......?

--- End quote ---

That's what I wondered. How long is it taking to warm up and how long on average are your journeys in time/distance?

GLIDN:

--- Quote from: Itguy on December 01, 2013, 07:19:07 am ---
--- Quote from: SkyJawa on December 01, 2013, 12:16:13 am ---Thermostats......?

--- End quote ---

That's what I wondered. How long is it taking to warm up and how long on average are your journeys in time/distance?



--- End quote ---

It takes about 10-15 minutes to get up to temp. Then no fluctuation from 90, on motorway or otherwise.
I thought this as well. Hence I decided to check temp reading on gauge vs VCDS.

Also replaced the fuel filter with a new one as well.

GLIDN:

--- Quote from: bacillus on November 30, 2013, 10:24:44 pm ---What are your fuel trims (block 032 and you don't need to start the car to run the measuring block)?

--- End quote ---

Group 32 (in engine)
Shows Lambda Regulation
Block 1               Block 2
-2.8% (idle)        9.8% (partial)

Human Joist:
There was a thread on here last week about warming up and it seemed to end with the conclusion that if it warms up and stays at correct temp but takes ages its the two smaller thermostats and not the main one. They stick this stopping the car warming up as quick. Apparently it should take 5 mins tops. Mine takes 10-15 and I intend to check/replace them both. Cost about £40 plus coolant which is worth doing too

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