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[downsmen]

 Just been to the garage again and it has failed again 
Its failing on the CO levels only everything else is in range,i have done paperclip test and changed all the sensors it was coming up as with a fault.
But its still overfuelling any ideas,
It feels like i am living at the Garage at the moment.
Please Help..

[mark.adams]

How is the CAT?

[downsmen]

it was a new system last year all the way through, allthough it wasnt a genuine vx one, could this be the problem?

[geoff]

when was fuel and air filter last changed,this happened to my 2 litre i had,had new cat and exhaust falled but changed fuel filter and give good service and flew throw emmissions

[downsmen]

air filter just changed but not changed fuel filter.
Would that really make a difference?
 

[geoff]

clogged old filter can stop fuel being filtered propperly,so ecu my raise mixture to run better i surpose,fuel filter should be changed every four years or 40 thousand miles which ever comes first,as said i changed mine and put some fuel cleaner through it and flew emmissions

[Kevin Wood]

Does the engine ECU report any fault codes?

Is the engine reaching the proper running temperature and doing so quickly after a cold start?

If you post the actual test readings it might be easier to diagnose. Typically, if it's only failed on the CO and the figure is not sky high (say up to 2 or 3 %), and you don't have any other factors such as poor running, trouble codes or blowing exhaust / manifold gaskets, I'd say it points to the cat.

Kevin

[downsmen]

Hi
here is the report from the MOT

Fast Idle
CO 0.76            Fail
HC 97               Pass
Lambda 1.03     Pass

2nd Fast Idle

CO 0.80            Fail
HC 97               Pass
Lambda 1.03     Pass

And the Codes from the ECU


0115 Engine Coolant Temperature Sensor
0403 EGR Valve
0110 Intake air Temperature
0100 Mass air flow Sensor

Since i found the codes i have put a New Engine Coolant Temp Sensor In and Swapped all the other Parts over from a Donor Vehicle.

The EM Light is no longer on but codes are still there
One last thing whilst putting the new Sensor i noticed that the PLugs for the Sensor and egr valve where swapped over.
 
I am now considering giving up with this and buying a new car

[geoff]

would still try and change fuel filter not that exspensive and not bad to do.co is hi so indicates high mixture running rich :yand some desent fuel cleaner for to clean fuel system

[Kevin Wood]

Lambda 1.03 actually indicates a slightly lean mixture, but within the allowable range.

If it has been running with the coolant temperature sensor incorrectly wired I would say this might have damaged the cat. That's borne out by the slightly high CO and HC readings whilst everything else is OK. IMHO.

Might be worth giving it an "Italian tune up" before a re-test and see if that helps but I fear it might need a new cat (or, preferably, good 2nd hand gen one from a breaker).

Kevin