Anyone have a brilliant ideas with this..

been trying to find the cause of a fault on my sisters KA sport...

When the engine is running there is a deffinate but subtle misfire, the engine doesnt pur as it should, and when you listen to the exhaust you get the odd cough/semi pop(but very quiet)...

Apparently it sometimes boggs down/hesitates when you try and pull away...


The engine light is on..

I have tried replacing the coilpack and HT leads, but this has not helped the issue...


She tells me the problem started after a front end smack she had... the TB and inlet manifold were damaged so had to be replaced...

One garage she spoke to suggested it was a damaged valve... But im not so sure..

Anyone have any brilliant suggestions of what to try next? How would a proper garage find the source of the problem..

(apparently the engine diagnostics just say there is a misfire.....not helpful!)

Its an injector fault. Had the same symptoms on my R26 took ages to find I even had the ECU sent away for testing

I bought two new injectors and swapped them round until fault cleared.

Worth a try I reckon

You can also get them serviced/cleaned here

link

[Edited on 26/6/10 by big-vee-twin]

Hmm...

Is it possible to test injectors?

You can listen to them clicking through a screwdriver - blade on the injector, handle in the ear.

But the issue is usually the spray patten not being correct. So not easy to identify - cleaning or replacement is the only way really

(typing not good tonight)

Oh by the way, my diagnostics said misfire too - caused by the poor spray pattern.

[Edited on 26/6/10 by big-vee-twin]

They are not cheap things to replace though...

How does one go about cleaning them? And would that be enough....

Find someone with an ASNU machine , worked on one of my injectors that wasn't working

Could be an air leak on the inlet somewhere.