JUst took my zed for an MOT and it failed on a couple of things :( but the most worrying was the emissions test.

 

My CO reading was at about 5% ?? and I think it should be at about 3%

The tester reckoned that when revved it would have gone up to about 7

 

It has been drinking the juice latley and occasionally the cat overheat light comes on.

 

I've seen the thread where you pull the hose to pass the test but I'd like to get this sorted really.

 

Does anyone know of any DIY diags / steps that I could take to sort this out??

Any help appreciated

 

:bow: :bow: :bow:

just been searching around the forum for you and found this...

 

http://www.300zx-twinturbo.com/tech/co/co.html

 

have a look

the cat overheat light normally means overfuelling i had this prob when first got my car had a full service and tune up to get it right now have no probs ans sailed through last MOT HTH

just been searching around the forum for you and found this...

 

http://www.300zx-twinturbo.com/tech/co/co.html

 

have a look

 

Cheers I've seen this which will help if I'm running out of time for the re-test but I'd like to get this sorted as there must be something wrong. :confused:

 

I'll try air filter, plugs and check the ECU for faults is there anything else that obvious to you guys?

 

also what do they do when "tuning" ???

adjust the fuel mixture check the timing clean your injecters out the other thing you could do is de-cat then they cant overheat :x:

adjust the fuel mixture check the timing clean your injecters out the other thing you could do is de-cat then they cant overheat :x:

Adjust the Fuel Mixture On A Z32 :confused: :rofl:

Mine failed on the same thing and a diag pointed to O2 sensors. Mine have now been replaced and will be going for MOT Tuesday...

Adjust the Fuel Mixture On A Z32 :confused: :rofl:

Bloody ell your up early !!!! ;)

as said, O2 sensors is the 1st place to start looking. the ECU has a diagnostic mode 2 that checks the operation of the O2 sensors. can be done with or without a ConZult :)

as said, O2 sensors is the 1st place to start looking. the ECU has a diagnostic mode 2 that checks the operation of the O2 sensors. can be done with or without a ConZult :)

 

I used

 

http://www.300zx-twinturbo.com/tech/co/co.html

 

to get me through the MOT worked a treat

 

diagnostic mode 2 - what is that ??

do you just mean check error codes on ecu or is this something else?

I used

 

http://www.300zx-twinturbo.com/tech/co/co.html

 

to get me through the MOT worked a treat

 

diagnostic mode 2 - what is that ??

do you just mean check error codes on ecu or is this something else?

 

no, after that mode there is mode 2 - it flashes the ECU light in time with the O2 switching.

look here:

 

http://www.300zx.co.uk/cgi-bin/manual.cgi?list=efec&dir=&config=&refresh=&direction=forward&scale=0&cycle=off&slide=49&design=default&total=190

Bloody ell your up early !!!! ;)

Or Maybe i was up Late! :D :cool: