k11 1.4l micra active, very bad idle, please help

[lala101]

Hi, I have a 2001 Nissan Micra 1.4L, active, it has 36000 miles on the clock, but has very bad idle when warm. When you start the car, and engine is cold, the car idles fine, as soon as the engine is at operating temperature the engine starts to idle very bad, it idles for 5 seconds fine and then its like the engine is about to die, then idles fine again, the only way I can explain this is very lumpy idle. I have replaced the complete throttle body and all 4 coils, the parts I used are in working order as I swapped them from a working car. Also I have replaced the spark plugs and fuel filter. The car has been stood for about 10 weeks, so tonight I am going to add some injector cleaner to the fuel and take it for a run.

Can anybody please help with what the problem can be with the car please.

thanks for your time

 

[frank]

any faultcodes lala ?

 

[lala101]

thanks for the response frank, no engine light is on the dash, is it still worth connecting the diagnostic computer?

 

[frank]

thanks for the response frank, no engine light is on the dash, is it still worth connecting the diagnostic computer?

worth a try, lambda voltage check too (maybe overfueling ?)

 

[lala101]

how do I check the lambda voltage please frank?

 

[frank]

how do I check the lambda voltage please frank?

from the black wire to earth mate, there are a few threads and vids on here

 

[lala101]

thanks for your response, how to I find the threads and vids please?

 

[frank]

thanks for your response, how to I find the threads and vids please?

with the search function here,s 1 http://www.micra.org.uk/threads/grr.55820/#post-585843

 

[lala101]

Thanks for your help. I have searched the forum but I can't find a step by step procedure of how to test the lambda sensor using the multimeter. Is there anybody who can give me a set by set guide of how to test the lambda sensor using a multimeter.
Also while the car is idling, if I disconnect the lambda sensor will it make a difference? Thanks

 

[frank]

you just tap into the black wire lala, sewing pin jabbed in or skin the insulation back a bit, then find an earth somewhere
i had my voltmeter/gauge attached to the 1st lamba (red arrow) but it is currently connected to the 2nd lambda (blue arrow)
your 2nd lambda is under the car btw, and yours have a 4th grey earth wire too

 

[r-reg-sr]

i had it with the idle valve,unplugged it and a little left foot breaking till the engine warms up.

 

[lala101]

thanks for all your help, do I have to connect the second sensor as well?

 

[frank]

thanks for all your help, do I have to connect the second sensor as well?

the readings from the 2nd one should slightly mirror the readings from the 1st one i believe (i hav,nt tested mine yet tbh)
so the ecu uses the feedback from the 1st lambda to enable it to run in closed loop under normal driving conditions, and the gasses are more mixed up while passing through the cat so that the readings from the 2nd sensor will be more stable

 

[r-reg-sr]

the readings from the 2nd one should slightly mirror the readings from the 1st one i believe (i hav,nt tested mine yet tbh)
so the ecu uses the feedback from the 1st lambda to enable it to run in closed loop under normal driving conditions, and the gasses are more mixed up while passing through the cat so that the readings from the 2nd sensor will be more stable

? what you doing with two of them

 

[frank]

? what you doing with two of them

just testin zed, comparing the voltage outputs n stuff

 

[r-reg-sr]

,,,,,,,,,,,saying nistune boy got the two recieving signal wires x2 sensor ?

 

[frank]

,,,,,,,,,,,saying nistune boy got the two recieving signal wires x2 sensor ?

no mate, the ecu is connected to the 1st sensor, and the gauge/voltmeter to the 2nd one

 

[r-reg-sr]

ecu lighting them both up ?

 

[frank]

ecu lighting them both up ?

they generate their own output zed they take twice as long to heat up without the white heater wires connected tho
here,s the voltage of the 2nd one (tenths of a volt)