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Old 1 Week Ago   #31
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Quote Originally Posted by AndyRKett View Post
What is your daily driving like, are you driving 10 miles down the road on every trip at a steady 80kph or are you sat in bumper to bumper traffic on the morning commute creeping a few metres at a time and burning a tank load of fuel while hardly moving ?

Did these problems exists from when you bought the car or are they something that has developed while youíve owned it ?
I bought car 4 months back, during covid19 lockdown, drove it home and next day i put new clutch plates, new water pump and timing belt , all new shock absorbers and front control arms with ball joints ends.
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Old 1 Week Ago   #32
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Re: 1.2 consuming too much fuel

Today i ordered new 02 sensor as well in order to eliminate the doubt.
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Old 5 Days Ago   #33
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Re: 1.2 consuming too much fuel

My wife does short runs (3 to 5 miles) but minimal traffic gets about 40 to 45 mpg (dont know what that is in L/100Km). I take it out for a fast drive every now and again.

A missfire (even barly perceptible) will increase fuel consumption. The ECU sees the unused oxygen and feed more fuel to compensate, often making the missfire worse. Weak coils and plug leads can be enough especially on wasted spark systems. Check the coil resistance values.
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Old 5 Days Ago   #34
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Re: 1.2 consuming too much fuel

why order new O2 sensors.

There are two.

Post CAT only checked the CAT is working fine.

Just swap them over.
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Old 5 Days Ago   #35
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Quote Originally Posted by DaveMcT View Post
My wife does short runs (3 to 5 miles) but minimal traffic gets about 40 to 45 mpg (dont know what that is in L/100Km). I take it out for a fast drive every now and again.

A missfire (even barly perceptible) will increase fuel consumption. The ECU sees the unused oxygen and feed more fuel to compensate, often making the missfire worse. Weak coils and plug leads can be enough especially on wasted spark systems. Check the coil resistance values.
I have multimeter, i will check the leads, what should be normal readings for good wires .
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Old 5 Days Ago   #36
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Quote Originally Posted by DaveMcT View Post
My wife does short runs (3 to 5 miles) but minimal traffic gets about 40 to 45 mpg (dont know what that is in L/100Km). I take it out for a fast drive every now and again.

A missfire (even barly perceptible) will increase fuel consumption. The ECU sees the unused oxygen and feed more fuel to compensate, often making the missfire worse. Weak coils and plug leads can be enough especially on wasted spark systems. Check the coil resistance values.
45 mpg is excellent, mine is giving 27 mpg, or should i just put new coils, map sensor, leads.
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Old 5 Days Ago   #37
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Re: 1.2 consuming too much fuel

Quote Originally Posted by Chali View Post
45 mpg is excellent, mine is giving 27 mpg, or should i just put new coils, map sensor, leads.
Or you could post photos of the cam shaft lobes of cylinder1 and cylinder4 with crank set at 0 degrees tdc.
That will cost you nothing .

It is possible that the cam sprocket has been bolted to the cam shaft in the wrong position, that would mean the mark on the cam pulley not in the correct place any more. In turn that would mean cam timing incorrect.
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Old 5 Days Ago   #38
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Re: 1.2 consuming too much fuel

I used to a VW Polo 1 litre. Easily the sh!ttest car I ever had. Absolutely cr@p on fuel. It never did idle property. I learnt afterwards not to pr@tt around with cars too much. I changed the head twice, carburettor, distributor etc.
But, it had been played around with before I brought it.
I should have got the basics checked the first time. As Jackwhoo says, absolutely confirm the engine basics like cam timing. My Panda never gives less then 45mpg.
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Old 4 Days Ago   #39
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Quote Originally Posted by Chali View Post
45 mpg is excellent, mine is giving 27 mpg, or should i just put new coils, map sensor, leads.
Hi, was it running fine when you bought it? Did the problems start after you fitted clutch and timing belt etc?
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Old 4 Days Ago   #40
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Re: 1.2 consuming too much fuel

are you sure you haven't got a fuel leak?
even a small one where the fuel evaporates will drop consumption significantly.
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Old 4 Days Ago   #41
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Re: 1.2 consuming too much fuel

Quote Originally Posted by 09 johno View Post
are you sure you haven't got a fuel leak?
even a small one where the fuel evaporates will drop consumption significantly.
A leak shouldn't effect the dashboard mpg as it's calculated by injector flow rates I believe
So least out the tank and hoses wouldn't show up
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Old 4 Days Ago   #42
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Re: 1.2 consuming too much fuel

Today i took my car for 20 miles run on motorway and surprisingly it gave me 54mpg on motorway (60mph), but as soon i went to city roads it again went to same 27-30 mpg ?
Can bad coils or leads effect this , as engine runs on less rpm in city, may be less current is passed from coils or it is same always ?
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Last edited by Chali; 4 Days Ago at 11:11.
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Old 4 Days Ago   #43
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Re: 1.2 consuming too much fuel

Another thing i noticed is that, after changing spark plugs the economy has gone better by 8 mpg (on motorway)
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Old 4 Days Ago   #44
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Re: 1.2 consuming too much fuel

Quote Originally Posted by chris3234 View Post
A leak shouldn't effect the dashboard mpg as it's calculated by injector flow rates I believe
So least out the tank and hoses wouldn't show up
it measures fuel in the tank, ABS wheel sensors and the ECU injector timings and then calculates


generally its fairly accurate over long time. However its way off after you keep pressing the reset button or the battery has been disconnected.


It best over hundreds of miles or better still thousands of miles
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Old 4 Days Ago   #45
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Quote Originally Posted by Chali View Post
Today i took my car for 20 miles run on motorway and surprisingly it gave me 54mpg on motorway (60mph), but as soon i went to city roads it again went to same 27-30 mpg ?
Can bad coils or leads effect this , as engine runs on less rpm in city, may be less current is passed from coils or it is same always ?
Thatís not how coils work.

That said itís funny how you get normal consumption on a good run. Where as the economy goes down when youíre in city traffic. I would like to refer you to my previous point about high fuel use of youíre sat waiting in traffic and burning fuel while not moving or moving very slowly.

Also how are you measuring your fuel use are you watching the instantaneous consumption ?
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