Aftermarket SR O2 housing: which O2 sensor? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

nissanguy13 · 09-20-2007, 08:32 AM

Did you run that motor with the stock elbow and o2 first? The sputtering and black smoke doesn't sound like an o2 problem. I ran the fat o2 sensor on my redtop for a year. It got shitty mpg and the idle would bounce a little every once in a while but never any black smoke or sputtering and spewing.

SHIFT_*grind* · 09-20-2007, 08:47 AM

I've driven the car the last 2 weeks on the stock elbow and skinny O2, ran perfect. Drove it to the garage, installed a 3" exhaust, 3" test pipe, already had a 3" downpipe, and a divided turbo elbow. The fat O2 sensor in the elbow was some random thing; the guy I bought it from said he thought it was from an 86 300ZX and would probably make my car run like shit, but I had to drive it home with that sensor because the skinny wouldn't fit

I mean, it has to be the O2 sensor that's causing it; more exhaust flow wouldn't make the car do what it was doing.

It actually ran fine for a while, up until I got to a stretch of road and punched it. It boosted up, got up to ~60MPH, and then fell flat on its face; sputtered and wouldn't go over 3000RPM the rest of the way home.

SHIFT_*grind* · 09-20-2007, 10:25 AM

So, now that I think about it some more...the guy who sold me the car said that, when he bought it, it had a blown SR20 in it (probably a redtop?). He swapped in a new kouki S13 blacktop motor, fixed it up, and sold it to me. I think I'm looking at two possible scenarios:

1.) When he swapped the engine in, it didn't come with the blacktop elbow and sensor, so he used the one already in the car (redtop elbow & skinny sensor). It runs fine, so I could drill/tap a bolt to fit the skinny sensor, or buy the adapter from megan racing.

2.) I could just buy a brand new sensor from some company. www.oxygensensors.com ... legit? Has the 95 300ZX TT sensor for $49.90, although they show that it's the same part number as for the non-turbo version, which sounds a little fishy.

SHIFT_*grind* · 09-20-2007, 02:42 PM

Quote:

Originally Posted by nissanguy13

Did you run that motor with the stock elbow and o2 first? The sputtering and black smoke doesn't sound like an o2 problem.

This made me start thinking; I had a friend helping me work on the car yesterday and he switched out my air filter while I was working on the exhaust stuff. I just went out to check, and......the metal retaining piece on the MAF plug is gone and the plug is hanging loose

Guess that explains why it ran fine for a while, and then fell on its face after I punched it (must have shaken the plug loose).

nissanguy13 · 09-20-2007, 02:59 PM

So the problem is solved?

Since you have a S13 SR20DET BLACKTOP: You should use the 95 300ZX TT O2 sensor

SHIFT_*grind* · 09-20-2007, 03:33 PM

The problem should be solved, although I'm at work so I haven't had time to put another retaining piece on the MAF plug and drive the car around. And it would probably run a lot better with a new O2 sensor than the random one that's hooked up right now.

Does it matter whether I buy the left pre-cat O2 sensor or the right one? Probably not, but I thought I'd ask...

SHIFT_*grind* · 09-21-2007, 11:59 AM

So not only was the MAF unplugged, I had blown off an intercooler hose. Previous owner hadn't even really tightened the hose clamp

Fastened the MAF, reattached (and TIGHTENED) the IC hose and it finally runs.

It backfires and hiccups some though, and kinda bucked a little bit when I accelerated in 2nd. Does that sound like a faulty/incorrect O2 sensor? I think so, but I'm not ruling out anything...

Anyone?

09-20-2007, 08:47 AM	#2
SHIFT_grind Nissanaholic! Join Date: Nov 2004 Location: NWA Age: 42 Posts: 2,066 Trader Rating: (7) Feedback Score: 7 reviews	I've driven the car the last 2 weeks on the stock elbow and skinny O2, ran perfect. Drove it to the garage, installed a 3" exhaust, 3" test pipe, already had a 3" downpipe, and a divided turbo elbow. The fat O2 sensor in the elbow was some random thing; the guy I bought it from said he thought it was from an 86 300ZX and would probably make my car run like shit, but I had to drive it home with that sensor because the skinny wouldn't fit I mean, it has to be the O2 sensor that's causing it; more exhaust flow wouldn't make the car do what it was doing. It actually ran fine for a while, up until I got to a stretch of road and punched it. It boosted up, got up to ~60MPH, and then fell flat on its face; sputtered and wouldn't go over 3000RPM the rest of the way home.

09-20-2007, 10:25 AM	#3
SHIFT_grind Nissanaholic! Join Date: Nov 2004 Location: NWA Age: 42 Posts: 2,066 Trader Rating: (7) Feedback Score: 7 reviews	So, now that I think about it some more...the guy who sold me the car said that, when he bought it, it had a blown SR20 in it (probably a redtop?). He swapped in a new kouki S13 blacktop motor, fixed it up, and sold it to me. I think I'm looking at two possible scenarios: 1.) When he swapped the engine in, it didn't come with the blacktop elbow and sensor, so he used the one already in the car (redtop elbow & skinny sensor). It runs fine, so I could drill/tap a bolt to fit the skinny sensor, or buy the adapter from megan racing. 2.) I could just buy a brand new sensor from some company. www.oxygensensors.com ... legit? Has the 95 300ZX TT sensor for $49.90, although they show that it's the same part number as for the non-turbo version, which sounds a little fishy.

09-20-2007, 03:33 PM	#6
SHIFT_grind Nissanaholic! Join Date: Nov 2004 Location: NWA Age: 42 Posts: 2,066 Trader Rating: (7) Feedback Score: 7 reviews	The problem should be solved, although I'm at work so I haven't had time to put another retaining piece on the MAF plug and drive the car around. And it would probably run a lot better with a new O2 sensor than the random one that's hooked up right now. Does it matter whether I buy the left pre-cat O2 sensor or the right one? Probably not, but I thought I'd ask...

09-21-2007, 11:59 AM	#7
SHIFT_grind Nissanaholic! Join Date: Nov 2004 Location: NWA Age: 42 Posts: 2,066 Trader Rating: (7) Feedback Score: 7 reviews	So not only was the MAF unplugged, I had blown off an intercooler hose. Previous owner hadn't even really tightened the hose clamp Fastened the MAF, reattached (and TIGHTENED) the IC hose and it finally runs. It backfires and hiccups some though, and kinda bucked a little bit when I accelerated in 2nd. Does that sound like a faulty/incorrect O2 sensor? I think so, but I'm not ruling out anything... Anyone?