Any help would be greatly appreciated

pcv would have nothing to do with it. i had nothing there when i was boosted nor do i right now

i would place bets on the o2 sensor if i had to guess

Last edited by 02NismoSpecV (2008-09-01 17:27:26)

TBS has been on for over a year. And let me take a pic of that PCV hose I'm talking about for you and I'll post it up in a sec...

How are you resetting it?

OBDII, and also did it using the manual's way as well....(turn the key 5 times....)

I think they are Megan headers yet they where on there when I bought the car so not sure. No branding on them... I'm going to remount my TBS, check the intake again, and take some pics really quick of that PCV hose I'm talking about.

Wow, im looking at the FSM right now and i didnt see that you posted that nissan says that the PCV hose could be a problem. Try that first and see what that does.

Its a little difficult to understand what the problem is from your post. But one thing i learned from the FSM is that this Code means that the mixture is LEAN, there is a seperate code for Rich. I would first connect the hose, then I would check each injector to make sure they are working.

Yeah, you need to take the intake manifold off, then disconnect the manifold. Then pull the rail out and the injectors with it. Unplug the power to three of the 4 injectors, and each time take the injector and put it into a bowl and have someone put the car in the ON position DONT TURN OVER, the ON position will prime the fuel pump and fire the injector a little. If it shoots then it works, try until you find one that doesnt fire.

That first pic, take a further out view I wanna see exactly where that is, and what it is. I think that connects to your throttle body.

one way to diagnose this would be to hook up a real obd2 reader to it and figure out what the fuel trims are... and then attempt to figure out if the o2 sensor is bad or if one of the injectors is malfunctioning.

you can actually listen to the injectors if you get one of those stethoscopes and listen to each injector, you should be able to hear them click identically

there is a vacuum hose that goes onto the back of the throttle body or intake manifold right after the tb which is what i think is the one u pictured thats not connected. the port if you wanna call it that aims towards the ground that is supposed to be connected to the line.

is the line coming from like behind the intake manifold/throttle body? 

edit: from the looks of it that looks like where its supposed to go so i try that before anything else

Last edited by 02NismoSpecV (2008-09-01 19:58:24)

umm that hose from the picture looks rather samll and it if its ot the tranny breather as it is an auto it shoud be connected to a brass fiting on the bottom of the intake manifold just after the tb.

this would cause a vacumm leak enough to throw a code but no enough to shut the car off. feel around for a brass nipple maybe take a mirrior an dlok for it

Last edited by dread1 (2008-09-01 22:36:53)

02NismoSpecV wrote:

there is a vacuum hose that goes onto the back of the throttle body or intake manifold right after the tb which is what i think is the one u pictured thats not connected. the port if you wanna call it that aims towards the ground that is supposed to be connected to the line.

is the line coming from like behind the intake manifold/throttle body? 

edit: from the looks of it that looks like where its supposed to go so i try that before anything else

Well I have 2 hoses shown. The bigger one (3 inches in diameter) that goes from the CAI  to the header/block. Then another smaller hose (maybe 1/2 inch in diameter) that was disconnected and has been since I bought the car over a year ago. I just found this hose chillin when I was cleaning up the engine bay about a month ago, cut the hose down to size and left a small piece on there just so dirt and crap wouldn't get into the nipple.

Before this car I had a Saturn SC2 that had the same deal with the 2 hoses. 1 hose (the larger one) connected to the CAI just after the MAF to the header/block, and the other (smaller one) connected to the intake as well after the MAF, and to the header/block. I remember when I removed the hose before, it smelled like oil. I was told at one point that the hose served a purpose (can't remember what) but it dumped a little bit of oil into the air intake for whatever reason.

I'm not certain if this is the same case with Nissan's yet the hose was connected to something at one point, and obviously serves a purpose, just don't know what. It can't go the CAI because there is only 1 hose connection and that is for the larger hose, not the smaller one. So ya I'm confused...

Last edited by nachtfrau (2008-09-02 01:08:04)

I looked all throughout the engine bay and I can't find where this hose goes. There isn't any open ports/valves anywhere near the hoses location at the tranny or near the TB assembly. I've dealt with this guy at my local dealership and he's pretty nice. I called him up and asked him what it was and he didn't know off the top of his head but he said if I brought it in he would look at it and tell me what it was. So I'm going up there soon and going to ask him what is it and if I need to reconnect it I'll grab some new hose and slap it back on and pray that it fixes the issue. I'll let you guys know...

EDIT: BTW Dread do you play CSS?

Last edited by nachtfrau (2008-09-02 13:28:44)

I think the spacer is your problem. Think:

The code says the car is running lean, then it must not be detecting the true exhaust gases. If it has a spacer in order to fool the O2, (the spacer is there to make it think its running more lean, cause without the main cat the 'exhaust' is real rich, hence the fuel smell) and you really dont need a spacer then your O2 would be reading lean, because it is out of stream, but your car could be running fine.

Maybe a more experienced member could check that idea, but thats what im thinking.

Just wondering dread, my g/f is in TAS and says she has seen you on there before.

Anyhow, put a new O2 sensor in, removed the TBS, and reset the ECU again. So far so good. Have only gone 50 miles but no SES light yet. Hopefully that has fixed the issue. It makes sense that there was too much air and not enough fuel in the mixture because of the TBS yet it's been on for a year and haven't had a problem until now. Odd that it just started to act up all of the sudden. Yet I know of many people who has the WPR TBS and don't have any issues. Guess mine's just anal retentive... Anyhow I'll update once I've driven it a while and the code hasn't come back on.

Ok now I'm pissed. Problem is back again. Threw PO171 today on the way home from work. Thought it was the TBS but it has been out for a month and no issues until today. I'm guessing at this point as to what it could be. Throttle Body Assembly was replaced about a year ago but it was a used one. Any ideas guys?

So solution would be to upgrade to a header with a cat? damn that sucks...

Big J wrote:

you need that PCV hose, or you need to cap it off on teh valve cover, it's an unmetered air leak.

2 different nissan techs assured me it was not an air or bypass hose. Reset the code, hasn't come back. Guess it's like Joe said, I'll just have to deal with the issue I guess. I hope it doesn't come on during inspection times.

Aight new data to add in the pool. I've cleared the code 3 times it's come back consistently within 30-50 miles. Also I had my car off all day on Saturday. Went to go start it Saturday night and it wouldn't start. The starter turned the engine over but it wouldn't start. You could def tell the car wasn't getting fuel. Now here's where I'm confused and correct me gentlemen if I'm wrong but

1. When you turn your key to the "ON" position the battery kicks in and starts the fuel pump which in turn pumps the gas to the engine. So if the car wouldn't start at all I'd say fuel pump to start with right?
2. However the car did start after I turned it on probably 3 or 4 times and pumped the gas pedal a bit. It struggled to start but started. I immediately turned the car off and let it sit for 15-20 seconds then tried it again. Sure enough it fired right up!

The car drives perfectly fine. Drove all over that night and Sunday as well. Then sat over night until I went to work today, and started up just fine. It's hit or miss with this. Now if it was a fuel pump wouldn't I notice other issues? Car struggling if I slammed on a gas because the injectors weren't getting enough fuel? This makes me think that it's the first fuel injector (all the way to the left if your starring at the engine bay) that is causing this issue. Would the car start if 1 injector wasn't working properly? (i.e. poor spray) I haven't gotten any misfire codes, just still continue to get PO171.

Last edited by nachtfrau (2008-10-13 19:54:20)

I'm positive it's PO171. Checked it by hooking up an OBDII sensor, and going through the manual way via SES blinks. After many nights of frustration and being pissed off, I decided to say screw it and pay the $85 for a diagnostic at the dealership. Got my appointment in 2 weeks, I'll update and let you guys know what they say...

Last edited by nachtfrau (2008-10-20 20:02:30)