Vauxhall Signum high mpg on tick over
Variant: 1.9 cdti auto 150
Model Year: 2007
ive had my signum for 2yrs been a great car,but its start to run 1.1- 1.3mpg when the car is at a stand still.its normal 0.2- 0.4. it happens only now and again and vauxhall couldnt find a code or get it to do it.it flys when running like this but drinks tons of fuel!
any help would be great as im not motor minded and dealer isnt intressted.
dave
any help would be great as im not motor minded and dealer isnt intressted.
dave
Posted: Apr 6, 2011 (13 years ago)
When it is stationary the car should be doing 0 MPG in theory...
Has the average MPG changed?
If it is an auto I would suggest putting in in 'N' while stationary. Leaving it in 'D' puts unnecessary load on things.
Have a look at the air filter - if it's clogged it won't help MPG.
Cheers.
Has the average MPG changed?
If it is an auto I would suggest putting in in 'N' while stationary. Leaving it in 'D' puts unnecessary load on things.
Have a look at the air filter - if it's clogged it won't help MPG.
Cheers.
Posted Apr 7, 2011 (13 years ago)
it actually sounds like the car is going through a REGEN on the DPF. Normally the car will do terrible mileage and shoud say 1.0-1.2 GALLONS PER HOUR at idle stationary (not MPG!)
The car needs to be run in third gear, about 60mpg for 25-30 minutes to allow the ECU to complete the regen program.
If after you have done this, it is STILL doing badly, then there is a problem with the DPF and ancillaries, (heated o2 sensor, the pressure sensor circuit on the DPF)
Hope that helps.
The car needs to be run in third gear, about 60mpg for 25-30 minutes to allow the ECU to complete the regen program.
If after you have done this, it is STILL doing badly, then there is a problem with the DPF and ancillaries, (heated o2 sensor, the pressure sensor circuit on the DPF)
Hope that helps.
Posted Dec 9, 2011 (12 years ago)
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