99 q45 Stumbling

[bdijanni]

Ok Im new to the Infiniti world, I have been working on Nissan 300z's for couple of years now, So I can get around an engine bay pretty good. I recently bought the 99 q45 for my wife, The Q started just stumbling at idle in drive at like a stop light or something like that. So I did a tune up the normal checked all connections, spark plugs fuel filter... then after I did that the check engine soon came on... I got it checked at local parts store, they told me my knock sensor #2 was bad and also o2 #2 wasn't giving any readings.. so I checked the harness on the o2 sensors they looked good, and everything else looks fine, after I did all that stuff now the Q is stumbling really bad throughout excelleration and idle badly almost like a dead miss, but not. It doesnt make the rpm gage jump at all? Oh when I did the plugs I put bosch platnums super plus' in it. You guys think this is a knock sensor issue? I dont want to do all that work if its not going to make the problem go away?? Any thoughts would be a hugh help..

Ben

[maxnix]

The Bosch Platinums are certain death for the VH series. Get the OEM NGK immediately!

Try a search on stumble, and you will find a few threads on how to approach this problem. You really need to get familiar with the FSM.

Welcome to NICO.

[bdijanni]

Well I read a ton of this stuff and it seams that a lot of people are playing around with cleaning the plenum and intake tubing, but sounds like to me that its a (KS) issue? Someone that has done these KS' before do I need a gasket set for the plenum and TB? And where can I go to get the KS' and Harness cheap? Oh yeah and the gasket set?

[maxnix]

Yes, without a clean intake system, things become tough to diagnose.

http://www.infinitipartsusa.com

Get the plugs too.