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Fuel Computer Problems..???

929 views 20 replies 7 participants last post by  VAS.ARGI 
#1 ·
Hi all,

Have a problem with the fuel computer and is really getting on my nerves...

Well I guess it is working it's just not functioning 100%..

Whilst driving the Instant Consumption reading fluctuates between 0.1 to 1.5.. but most of the time it lingers between 0.1 to 0.4..

Firstly, does anyone know what could be the problem here...?

Secondly, where does the FC get it's info from could the sensors be at fault or does the FC simply need to be reprogrammed..??

I have read some of the previous posts and the member 'IANV6' sticks out to be the guy able to re-program FC's to what ever spec you car is at providing he has the program code for that model...

Stuff that may help..

Car: Cav GSI2000 ..
Year: 92J...
Wheel Size: 17x205

Any help welcome.

Cheers

Matt
 
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#3 ·
Paperclip pins A-D of the Diagnostic plug.

- - - - will display if there are no faults stored

Have a look on my Sig, then How Tos, for more Fuel comp info
 
#5 ·
the trip computer in my astra is playing up it seems to be inacurate with fuel when i get down to a quarter off a tank it comes up with an f and reads no fuel in it does that mean a censors gone or it needs re setting (help) it really pisses me off:beer:
 
#10 ·
#11 ·
racingsnake2 said:
the trip computer in my astra is playing up it seems to be inacurate with fuel when i get down to a quarter off a tank it comes up with an f and reads no fuel in it does that mean a censors gone or it needs re setting (help) it really pisses me off:beer:
Sounds like the fuel tank sender is at fault


Mark - The range will use current speed but I cant see it using average consumption as the range value changes too often compared to average consumption i.e. range changes every few moments whereas average consumption cant remain the same if its measured over a long enough period without being reset.


Its more possible it uses instant consumption to a point.
 
#12 ·
i have some problems with the computer in instant consumption when the car is in idle has increased 0.2 in the midle temperature not cold not too hot
they told me that is a sensor who is reading the consumption
this sensor is outside the inlet manifold in the right side near the master cylinder as we look the engine from the front of the car ( is that correct )
i change it with a new one but nothing happen no improve the problem remains
does anyone knows what to do ?
 
#15 ·
As a test I let my fuel tank run to the red the put in £5 worth reset the FC it shows 212...

As for the 'average speed' it just shows '- - - -'...

So to sum it all up.. All of the below must be faulty..

*Speed sensor
*Injector sensor
*Fuel reading sensor.
 
#17 ·
My problem is that the instant consumption from 0.9 when the car is in idle position and the engine is in the correct temperature not cold not hot has go to the 1.1
i made the service
i clean the injectors
i change the sensor in the inlet manifold as i was told from the garage that from this sensor the trip computer reads the instant consumption but nothing changed to 0.9 as it was before the 1.1 still remains
do you have any suggestions andy k ?
 
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