Hi my uk 300 zx twin turbo is running rich and gets worse when it warms up it smells as if its on choke although the rpm is about right a slight missfire at revs but not at tick over has a recent cambelt change any ideas guys cheers louis

What size are the injectors? Is it on stock ecu?

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HI THE WHOLE CAR IS FACTORY ONLY STARTED THIS RICH/CHOKE AFTER I HAD CAMBELT CHANGED ALTHOUGH I DONT BELIEVE ITS THE CAUSE 

300 ZX TWIN TURBO ,MAN UK SUPPLIED 76000 MILES 

On 05/06/2022 at 14:21, topdog8888 said:

HI THE WHOLE CAR IS FACTORY ONLY STARTED THIS RICH/CHOKE AFTER I HAD CAMBELT CHANGED ALTHOUGH I DONT BELIEVE ITS THE CAUSE 

300 ZX TWIN TURBO ,MAN UK SUPPLIED 76000 MILES 

Hi and welcome back to the club mate!

If your Zed has only just started doing this after a cam belt change, then I would ask....

1. Who did the 'belt change
2. Did they use a genuine Nissan belt kit

The timing marks on non-OEM kits - even supposed quality brands like Blueprint - have been proven to be "out" And whilst a competent mechanic should still be able to perform a cambelt change, they would probably not realise that the timing marks were not quite right! One tooth either way, may not damage your engine, but the car sure as hell would not run right.

That's why I would only use a Nissan belt - and why I would only trust Jimmer to do the work, these days.

 

I’m afraid that could be a variety of things. 
As Richard says it could be the mechanical timing is off. 

To do the belt though, the wiring harness will have been disrupted as would the inlet pipework. It could be as silly as the ECU temp sensor not seated correctly. 

You’d have to start at the beginning. If you have access to software, it will make things much easier.