Car mechanics advice needed.

[Liam_J_Kelk 10]

Good evening.

 

My wifes car has failed its MOT on the fuel emissions. I have changed the back box as it had a hole in and also the cat section.

 

It is still failing on emissions.

 

Does the cat need to be run in? Is there anything else i should be looking at doing?

 

Car is an X Reg 1.1 Clio Grande

 

Thanks

[geared 299]

Do you give it a good Italian tune-up before it go's in for the test?

 

Have you read any fault codes, could be something like the engine temp sensor.

[mafya 238]

Have a read of this= http://www.pistonheads.com/gassing/topic.asp?h=0&t=805866&mid=0&nmt=Major+MOT+emissions+failure!

It also states what needs to be looked at

[boringal 10]

Good evening.

 

My wifes car has failed its MOT on the fuel emissions. I have changed the back box as it had a hole in and also the cat section.

 

It is still failing on emissions.

 

Does the cat need to be run in? Is there anything else i should be looking at doing?

 

Car is an X Reg 1.1 Clio Grande

 

Thanks

 

try changing the lamda sensor, its positioned on the exhaust just behind the cat

[bossdogg 10]

Put some engine cleaner in called forte never fails

[Dardandec 32]

Post the readings on here and we'll have a better chance of advising you.

 

A blowing exhaust can cause a high lambda reading but you have sorted that. High HC is unburnt fuel so a possible misfire and high CO could be a faulty cat, but you've replaced that. Also a blocked air filter and dirty oil can cause high CO.

 

When was the last time it had an oil and filter and air filter?

 

And no a catalytic converter doesn't have to be run in.

[mafya 238]

Put some engine cleaner in called forte never fails

 

I use Forte fuel system treatment every service in my van and car, its top stuff!