Jump to content

N/A failed mot on emmisions?


Recommended Posts

My 93 import Z32 N/A auto, sold it earlier this year to a lad down the road.

He rung me today saying it's failed the MOT on emmisions? I had it through 3 MOT's and never had a problem? It's completely stock except air intake and in very good low mileage mech condition.

He said the MOT chap said it was worse on idle than mid revs? he's going to bring it round in the morning so I can plug the laptop in for a look.

Any suggestions on what might be the cause before I take a look will be greatfully received :D

Link to comment
Share on other sites

Cheers Nick, He popped round this morning and we had a quick play around.

looks like the left hand 02 sensor has gone. Did a comparison with my zed and both my 02 readings are almost identical at idle and flick up and down nicely when you blip the throttle.

On his car the right hand 02 was giving results similar to mine but the left hand completely different, sometimes zero and then a reading? checked the connectors and were clean like new.

 

All other readings looked normal and had a good look under bonnet but could see no obvious problems.

 

Tried the trick with pulling the vac line of the balance bar, he popped back round the garage for them to re-check. They tried the probe up both tailpipes and they said it was worse?

 

So does a failure of either 02 sensor cause a default increase in fuelling on all cylinders? Anyone?

Link to comment
Share on other sites

Tried the trick with pulling the vac line of the balance bar, he popped back round the garage for them to re-check. They tried the probe up both tailpipes and they said it was worse?

 

Bit of an update, The Mot guy was a bit busy in the morning and told him to bring it back in the Afternoon and He would have a look at it.

 

He took it back in the afternoon with the Vac line still disconnected and the emissions had come right down in spec and it passed :dance::nana2::dance:

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

Terms of Use