Having idling issues maybe o2 sensors?

[Fridge]

For some time now I have been having a rough idle on my 91 q. I replaced the injectors a while back and they ohm out ok. The plugs have about 20k on them. I took a laser temp gun and checked the exhuast temp on the manifold coming out of the head and all the cylnders are within 20 degrees of each other.

I am going to replace the o2 sensors since they are original to the car my thinking is maybe they are leaning out the mix at idle.

I found 2 different ones at sparkplug.com the borsch are twice the price of the ngks I read a old post where they may be made by the same people. Any ideas?

[qship96]

I went with the NGK {NTK is their name for their 02 sensor division} from sparkplugs.com for my 96q......they were the EXACT same sensor as from the Infiniti dealer, for about 30% of the price....fit perfectly,harness and plug were a direct no hassle fit.

I would not go with the Bosch, even if they were 1/2 the cost of the NGK!!

[Fridge]

Hey thanks Qship. Iwill go with the ntk I really hope I can get rid of the miss I have almost given up on it..

[maxnix]

I would look first at your IAC valve first, then the rest of the intake path and fuel system.

[Q45tech]

On Q45 especially before 1994 O2 sensors are totally ignored by ecu at idle! 1994 and 95 are partially sampled so they could in very rare situations.

OBDII [1996 and later] play an increasing role.

Of course O2 sensors can affect cruise steady state rpm MPG by up to 20% as they can trim fuel injection by +-10% band to bank to compensate for injectors and dirty intake valves and passages.

[Fridge]

alright got the new sensors installed. Kind of a pain in the butt but if you have a lift it makes it much easier. I was able to use the o2 socket and a couple of long extentions. Runs a lot better but the miss is still there I guess I will have to pull the plenum... SIGH