Ok, i've done the search thing-seems to be a million answers.but....

 

I parked the zx up on tuesday night, quietly thanked it for getting me home safely, in the worst rain i had seen in ages.

I even thought 'ooh, nice.still running smooth'

Get in it today + Its missfiring Straight away constant rough running, nearly undriveable. :confused:

Sooo.

I've got two hrs to fix it, before a long journey tomorrow. any ideas?

 

Its uk, all stock air filters,bodywork,everything!

Was going to say wet air filter but you have stock so cant be... must be one of the other million things it could be.. PTU, coilpack, connectors, plugs.........

Possibly water on electrics, check fuse box by drivers well, had a leak there myself after heavy rain, due to split in tube drain from targa top that runs down the A pillar!

Aargh

I cant even get to the ptu?

have you double checked the injector connectors?

i'd say a coil

Right.

I managed to swap the coil.same symptoms.

new plug.same syptoms.

I Took The coil out, old plug fitted, and the spark looks 'weedy', was very light out though!

I'm Going to make sure the injector is working tomorrow, the plugs are very green-cheers saz!

Have you checked wiring by fusebox yet? as it seems to have started just after heavy rain. Try drying out with hairdryer? took me three days to find thats what it was with mine as it didnt look wet but water had got behind box and was shorting connections. Dried it out as above and hey presto aok ,then found split in tube.

Have you checked AFM?

Hi.

afm looks like good connection, trouble is i'm working long hours this week, so only get odd moments to look at it.

If its light when i get home, i will try fusebox :hyper:

The trouble with AFM they look ok but just go; need to do voltage check or replace with one known to be OK. Can you rev to over 2.5 K If AFM it will not let you, fail safe mode.

It revs ok, just misses.

I cant tell if it is a dead injector or what.

Got 13.5v across injector.

13.5 between coil volts.

Sooooo confused!

Ok.

I've done a 'datascan' consult type thingy, showed 55.no faults.

Checked for water in fusebox.none, dry all about, although i couldn't get it right out.

The injector seems dead, got 13.5v across the connector, managed to clean it

+ still dead as.

Is there any way to confirm if injector really is dead, or if its missing a trigger from ecu/whereever

Who does plenum off jobs in bedford area??

 

Thankyou!

PTU connectors or dying PTU, have you checked coil pack connectors. disconnect each one to see which one it is. also could be injectors;clean.

I have cleaned:-

ptu connections-both sides,

cas connection,

afm connector,

ecu connector,

injector connector,

coil connector,

also dismantled + looked at circuit board of ecu- nowt obviously wrong.

Also checked throttle bodies are opening/closing ok,

Seems to have a good spark on the duff cylinder,

by turning over cas shaft by hand, ALL the injectors clicked.

Running out of time+ ideas now, could be a dying ptu i spose, but i've got no way to tell. :cry:

Think i'm going to admit defeat+ book it in at a nissan main dealer :hurl:

Oh yes, compression 170 psi too.

dont go to nissan, youll get fleeced! try somebody in your meet area that has got a conzult to run a check.

Or try Jeff at zedworld or Andyduff on this site?

should be able to point you in the right direction.