when i turn on my ignition, the emission check light sometimes doesny come on , also the petrol wont flow, but as soon as the light comes on , maybe 2 mins wait, i can hear the petrol flow and the engine fires up normally, other times its okay, (intermittent prob) any ideas??

john

 

when you wait, do you have to jiggle the key or otherwise move it
in the lock? sometimes the key can get so worn that some of the
tumblers in the lock don't move following the profile of the key.

 

No. the vehicle has covered 230,000 kms, and is in a very good order, the keys locks etc are in remarkable good condition considering the k's

 

Well, the fuel pump has its own fuse, which i think should be
connected to the main ignition relay (i don't own a third gen)
which could be on the way out. this relay is usually fused by
a big (100 amp or more) one. In a 10 year old car anything that
has a moving part is bound to wear. How can you tell if the lock
is good unless you take it apart?

 

I can switch on the ignition, and every light comes on that is supposed to come on, except the one I mentioned, I can sit there for two mins not touch the igniton switch and suddenly you hear the fuel go through and then it will start as soon as I crank it. also occasionaly the engine will cut out and I have to stop and I have to occasionaly wait again.there are days when it behaves perfectly.a friend said it might be the relay, oh how do I get to the fuse?
many thanks
John

 

I think at this point your best bet is to get a haynes manual and
check out the chassis electrical system diagram. there may be multiple ignition relays that you need to test. on my 92 SE-R there are three ignition relays next to the fuse panel below the steering wheel. you may have to take the bottom dash panel off to see the relays. if the haynes manual shows ignition relay 1, 2, or 3, then
look for relays with the same color. Having said all this, on my 83 sentra (RIP) it turned out to be the starter solenoid, which is right above the starter. When you say "not touch the iginition" is the key in ACC position for 2 mins or is it at the off position for 2 mins?
if it's at the ACC position then it's very likely that it's the relay. if it's in the off osition then it's probably the lock.