Hi all had my x300 in for mot today an 1 of the things it failed on was emissions but the hydro carbons was good an the idle was good but failed bad on the higher reving I was told it should be .3 but it was 1.6 can anyone give me an idea on what the prob could be thanks shaun

 

It could be that the cats weren't up to temp.

Give it a good hard drive then get them tested at a local friendly garage and see if that helps

 

like mike says give it a good drive to get the cats warm

 

try some FORTE, whole bottle, if not 2 into your fuel tank, and give it a good run with heavy foot before the MOT, that should help as well, just don't get the flippin' Redex, as it won't do much!

 

I'm sorry to inform you that your car suffers from intrusive, unchecked emissions from government regulatory offices.

 

Thanks for the replys guys whats that forte stuff firecrow is it engine treatment

 

yeah, it's a bit like Redex, with the difference this actually works. And it is highly unlikely that you'll find it in any shop like Halfords, as Forte sells their products directly to garages. But you can still find it on good old eBay

Forte Advanced Formula Petrol Gas Conditioner Injector system Cleaner Treatment | eBay

I've found out about on Focus Owners forum, and tried it on the Jag, with rather good results! All the best mate!

 

All the best with the next test.

As per the others, I always give any car I take for testing a really good blast beforehand to shake out the cobwebs and get things up to temp.

Then arrive at the appointed time.

(redex smells nice though)

 

Heres an update guys ive replaced the lambda sensors an it didnt effect it at so the next step is the water temp sensor an the maf see if that makes a difference I gave it a real good thrash out an took it for emitions test after I did the sensors but still miles out

 

How about trying some diagnostics before changing parts? Like what are the LTFT and STFTs doing? What temperature do you read on the temperature sensor. All of these can be read on a scanner that costs less than any one of the parts you are replacing!

 

i personally would recommend CATACLEAN - its about £18 a bottle and add to a 1/2 tank of fuel then take it for a hard drive down the motorway, ive done this no end of times and it works, also ensure the cats are upto temp when they get to the MOT station,

James

 

Hi guys got it pluged in to a computer today an came up with 2 faults 1 a purge valve an 2 the throttle position valve/potention meter so I changed the throttle position valve for a good spair 1 I had an orderd a new purge valve off the web so fingers crossed this sorts it

 

Hi guys another update I have now decided to take my jag off the road to do a full resto on her when I work out how to post pics I wil post them as I go

 

Check this thread for info on posting pics:

https://www.jaguarforums.com/forum/j...pictures-2418/

You can either link to OnLine storage or upload from your computer.

Graham