X Reg 1.0 cutting out woes

[colin potter]

Hello, seeking advise please as end of tether with me Micra.
Car usually does only short journeys and cut out a few weeks ago, total loss of throttle response, stalls. When trying to restart to turns over but will not fire.
No errors on the computer log.
Soooo, a trip to local garage and one mass airflow later thought all was well, got 10 mins down the rod and it broke down again....back to garage and they diagnosed that voltage regulator to mass airflow sensor was putting out 12v rather than the required 5v so replaced that and the airflow sensor again as that had apparently blown again...
Was fine for another week and has now done it again, cant spend much more on the car, any ideas please if this is a common fault. been a lovely little car and dont wat to scrap it if its simples to fix.
Many thanks

 

[frank]

the maf,s can be troublesome on the coilpack models colin, how does it run with the maf disconnected ?

 

[colin potter]

thanks for reply, im not very mechanical but are you saying i can just disconnect the maf? if so does it sit inside the air-filter box?

 

[frank]

on the side of the throttlebody mate they tend to run better with it disconnected (but drink more fuel)

 

[colin potter]

thanks, I will have a poke around tonight and start disconnecting things
Cheers

 

[frank]

some pic,s on here probably
http://www.bba-reman.com/content.aspx?content=nissan_micra_bosch_throttle_body

 

[colin potter]

thanks the answer is she doesnt run, still the same just turns over wont fire.
grr i think it is a coilpack version, square boxes on top of each cylinder

 

[colin potter]

ok, now im confused.com. Went out and ran a sponge over micra with a view to ebaying it as spares/repair. had another prod around (im not mechanic).
So before with mas sensor disconnected it wouldnt start, dug around found these 2 blue boxes, pulled them both out and swapped one for the other, left mas disconnected and it starts...???
so if i flog it i still have to state its got a problem or do i keep it and see how it runs / risk it cutting out again? answers on a postcard, thanks in advance

 

[frank]

sounds like it was the ecu relay colin

 

[colin potter]

thanks for replying Frank, do you think that its fixed now or am I looking at a larger problem like a faulty ecu? Cheers

 

[frank]

try it out mate, and time will tell

 

[davyboy]

Run it for a week and let us know bud. Similar to a problem I have, I'm changing my tps switch this week, I'll let you know if it fixes mine.
Good luck.

 

[Machinehead]

I read the blue relay is common(ish) failure, and can be swapped for the one next to it (care that the connecions are the same). I had to do this on mine too.

Now it car is up and runing ok you have, of course, put a duff relay in to the other circuit so my advice would be to replace the blue one, and swap the other relay back to where it came from. Hopefully all will be good!

 

[colin potter]

thanks all who have made suggestions on this, i have had to sorn it so wont be up and running until next month now (thought i was gonna have to sell it)
googling the relay serial number they seem to be fuel pump and fog light relays - FUEL PUMP FRONT FOG RELAY 25230 9F920
starts up first time though, its a bit petrol smelly round the back when running (maybe because mas is unplugged?) and fog light is currently working for info.

 

[colin potter]

aha could be front fog lamps of which i have none

 

[davyboy]

Hello Colin....update. Had my tps changed today, and my problem gone Also whilst checking her over the fitter found a piece of gauze obstructing the carb, so may have been that as well.
Thanks to H701 for suggesting that cure many moons ago - cheers bud

 

[colin potter]

Hello davyboy, glad you are up and running, what is a tps please?

 

[davyboy]

Hello davyboy, glad you are up and running, what is a tps please?

Throttle position switch....£8 on ebay, fits on the pedal I think.

 

[SirChris]

Hello Colin....update. Had my tps changed today, and my problem gone Also whilst checking her over the fitter found a piece of gauze obstructing the carb, so may have been that as well.
Thanks to H701 for suggesting that cure many moons ago - cheers bud

The gauze is there for a reason lol

 

[davyboy]

Hello bud, I took the filter out when I fitted the cone filter, but missed this bit of gauze, its been sitting on top of the mesh into the throttle body restricting air flow. Me bad

 

[SirChris]

Oh so ur not talking about the mesh attached to the inlet of the tb?

 

[davyboy]

No, a bit o

Oh so ur not talking about the mesh attached to the inlet of the tb?

No a fibrous gauze that fitted in the pipe somewhere.

 

[SirChris]

Ohhh the filter for crank case vapours to be re burnt on the original air box.

 

[davyboy]

Ohhh the filter for crank case vapours to be re burnt on the original air box.

Like I would know that I wasn't any good at mecanno as a boy LOL

 

[SirChris]

Lol maybe I don't know either. Just saying things randomly.. Bit really loud so it seems like I know what I am doing lll