misfire help

[skidoo]

hi chaps im sure someone out there knows my problem, i have a very bad misfire between 2k&4k below that and at idle it seems its only running on one bank above 4k seems ok im thinking coil i have new leads and plugs would you all agree or am i missing something ta

[natben]

Leads,Plugs and coil would be the best place to start, worth checking all the leads are seated properly as well before buying a new set.

[skidoo]

ok put new coils,leads and plugs today and its still the same i put the computer on it and at idle one o2 sensor reads about 1.5v the other 0.0v is this the fulty part or is it just reading the problem elsewere

[ridds]

Hey Norm, normally a non switching Lambda is caused by a faulty Lambda sensor but I think when I set mine up recently if your throttle pots are too far out it can cause the Lambdas to shut down.

What are your pot readings? Are they steady (no jumping around) also try switching the Lambdas from bank to bank (and the connectors!) and see if the problem follows.

[skidoo]

hi matt the tps is at 18% both banks good idea to swap sensors and see but is the 02 sensor reading a fault or is itself at fault..... that is the question....btw when you get over 4k that engine pulls like a fking train many thanks

[ridds]

Jolly good! glad to hear you're mobile again even with niggles.

[ukkid35]

skidoo said:

when you get over 4k that engine pulls like a train many thanks

Perhaps this because it goes open loop when you're over 4k, ignoring the faulty lambda reading.

[skidoo]

ah no i sussed it in the end i had the o/s o2 sensor plugged in the n/s o2 sensor what a numpty