aackshun

iTrader: (3)

I'm sure this has been discussed before but time for a 2013 version....

Coulda swore if a car can throw fire crackers out of the exhaust on command it was a sign on it running rich... Hell the car even throws black smoke on occasion.

But the spark plugs no lie, car is running lean for sure.

Setup is...

Bomz Intake
NWP Spacers
OBX 3.5L Headers
2.5" Test Pipe
3" Catback
EGR Deleted completely
3 Working o2 sensors (This is unusual for me)
LW Flywheel
350z Fuel Pump

Now, question is..... Can ashy white spark plugs be something else? Or is this not news and I'm here ranting like an idiot.

Discuss

aznprid972

iTrader: (26)

Any vacuum leaks?

VisciousMo

iTrader: (4)

Damn aaron, 02's plugged in and still spittin fire? I have a pretty similar setup to you but it's not often I will see flame



How's the white car pull vs. the red car? That flywheel was worth it, aye

njmaxseltd

iTrader: (19)

The only way to have combustion in the exhaust is to have fuel present. = To rich
Black smoke = To rich

litch

iTrader: (2)

Aackshun, maybe you need to check for leaks before the maf??? That bomz intake might be a leakin??

carsnwomen91

Can you hear knocking under load at any rpm?

best thing would be to buy a used or borrow a wb02 and check.it out... I know you're still waitin for ms3 but Grab an AFC, you're missin ponies from not tuning it Lol

Kevlo911

iTrader: (36)

pics of plugs

you have all that stuff on the car but no afr meter?

schmellyfart

iTrader: (46)

FWIW I only throw flames when I'm running lean.

carsnwomen91

Y'all are some super flamers

damn cat

aackshun

iTrader: (3)

Azn, I checked for vac leaks using the good ol spray everywhere method, I couldn't get my idle to blip anywhere around the LIM or UIM.

Jes mang, I'm trying to improve my mpg and I just put the o2s back on for lulz, didn't help any... Just made me remember why I took em out
Ehhh, its clear this motor is making more than the red car did, but the lack of gearing makes it nowhere near as fun as the red car.


Ill check it out, the couplers are pretty crusty these days lol.

Carsnwomen, no. I did have terrrriiibbleeee misfiring under loads before I changed the plugs, it got to a point to where leaving red lights were a chore.

Kev, I know right? little fcks are given about the white nightmare.

Smelly, interesting.....

Flame on!

litch

iTrader: (2)

So you changed the plugs and that cured the misfire, could you have had residual white ash from the misfire that would coat the new plugs?

Crusher103

iTrader: (10)

everytime i pull plugs out of the DDs they are either reddish or white in color, one is on a completely stock car. But EGT gauge and a wideband will clear up any confusion, so stop being cheap.

carsnwomen91

Lol ur brave! I **** my pants at the faintest sound of knockin... my most noticeable area was 2.5-3.5k when I was tuning, even at 13 afr (wot) and 94 octane I got knock At 30% throttle :O I had to Add fuel to get 12.5 And decrease the wot fuel map to 50% and So it interpolates the richer settings sooner.

i like the vafc2 ... Just wish it ****ed with timing. but dude you really need to get a wideband and for the time being I'd unplug the rear o2 and maybe the primaries too if u still need more fuel lmao what a crude way of tuning! It reminds me of my buddies Audi 200 turbo with cisc

aackshun I will flame on next year! I'Ma get my hands on a used bee*r, slap on My cannon, a res'd test pipe add my HS headers and scare the **** outta ppl! Lmao

aackshun

iTrader: (3)

Litch, I only checked the old ones.

Crusher, the red cars's used to be reddish/white but then it turned to blackish-brownish-red.

Btw I use coppers, change em when they misfire, this is the first time I've seen em like this though, that's why the cool thread...

carsnwomen91

Buy maxfever1987's MEVI (nice top end bolt on to compliment headers), a wb02 (you're gonna need it later With ms3 anyways), and a cheap AFC for the time being and sell it when ms goes through.

btw do u have a breather on the valve cover? unmetered extra air might be contributing to lean mixture

aackshun

iTrader: (3)

Ta-dahhh!

Carsnwomen, I am a known hater of VI's.
also, I think I have a cracked vacuum line somewhere, but so far the spray vacuum leak detection method has yielded no results.

maxgtr2000

iTrader: (29)

AFPR yes/no?
My plugs somewhat look like that and I have a wideband. Looks like the system burns fuel well. Everything runs stock except when I go into boost. Check the porcelain portion of the plug for black specs, that will help tell the tale, if there are black specs I would look into the fpr or a malfunctioning injector. Definitely get a wideband.

Crusher103

iTrader: (10)

Those plugs look fine actually.

Get a fcuken wideband you b1tch.

ABIGBRAIN

iTrader: (1)

They look better than the set I changed out today.... did some 180,000 mile maintenance this afternoon.

Andy

aackshun

iTrader: (3)

^ What did yours look like?

No all of them have a nice shade of dengyness/grey.

Now I'm scared to post one of the red car's then I wonder how those look post-mortem.
I know the previous sets were definitely A LOT darker (no sign of running lean at all) w/ red on the porcelain parts.

I'll post those tomm, I'll pull em out of the motor for 's

Ok, fine I'll get a wideband *sigh*

ABIGBRAIN

iTrader: (1)

Here is what they looked like after 60,000 miles. The plugs are laid out in the pictures as they sat in the engine. Pics with flash look lighter than they really are.


As viewed from drivers side fender


As viewed from the front of the car.






Top shot... camera flash makes the plugs look lighter than they really are.

asand1

iTrader: (1)

Lean mix would cause misses, resulting in some fuel and oxygen in the exhaust. When enough of both collects you'll get a backfire. Afaik backfires are usually from a lean condition. Deleted cats will exasperate the condition.

ShocknAwe

iTrader: (3)

Look completely normal to me other than some glazing and thats probably because you accelerate hard often. Now if they were blistered, you would likely be running lean. I reference to this when I pull mine:

MIKERNM1990

Your spark plugs look fine to me. Do you tune afr adjustment?

Fakie J Farkerton

iTrader: (51)

Well, the title says untuned, so....he probably has not.

MIKERNM1990

I think too leaning w/o tune.

aackshun

iTrader: (3)

Have you read the thread though?

I can shoot little flames out the tail pipe on command (signs of running rich), yet my spark plugs look nothing like I am running rich.

Also, my previous spark plug changes have looked nothing like these...

Abigrain's first photo are what the red car's used to look like, with maybe some carbon deposit, I'm pulling the red car's death set tonight.

MIKERNM1990

pm

litch

iTrader: (2)

my money is still on a little leak before your maf causing some timing misfiring, hence the flames, but still running lean

maxgtr2000

iTrader: (29)

Since there is no cat really the fire out of the tailpipe wouldn't be a phenomenon, unburned fuel particles get into the exhaust and there is no heated converter to ignite the particles, they are ignited by the heat of the exhaust. I'm starting to think of a timing issue. If timing is too far advanced it will cause excess heat, enough heat to cause the backfires. So if you have the 350z pump with the stock fpr and you tried to decrease fuel through the safc it indirectly advances the timing. On the other hand if your knock sensor was dead and you increase fuel it retards the timing which would also cause excess heat. When you get the wideband and log some runs you will be able to see what's going on.

dwapenyi

iTrader: (3)

Surely you mean after the MAF, right?

litch

iTrader: (2)

I don't claim expertise on this, so feel free to tell me I am retarded if I am not making any sense...

But...


If he is throwing fire I would assume that he is at wide open throttle when it happens = misfire

Misfire @ wide open throttle with the symptoms on the spark plugs being ashey and white = leak

... never mind... I was just thinking what I was saying in my head, and I ment after or closer to the engine, not the air filter, that is what I mean by before the MAF, so in the sense of following the airflow, AFTER the MAF, but in the sense of following the engine, Before the maf...

dwapenyi

iTrader: (3)

Your observation of your plugs says lean, but all your other symptoms;

bad gas mileage
flames in exhaust
EGR delete not recycling unburnt fuel back to the combustion chamber


say rich, so

aackshun

iTrader: (3)

Thus why the cool thread......

The plugs just make no sense, and I would trust them over secondary symptoms....

I'm going back to no o2 sensors for the next 6 months, we shall see what the plugs say then....

dwapenyi

iTrader: (3)

Maybe your VQ needs some TLC, as in TC-W3

Seriously, when you 1st use TC-W3, a whole lot of carbon gets blown out of the system. People have bee noticing blackened exhaust pipes and cleaner intakes.

aackshun

iTrader: (3)

Used it for a few tanks ages ago, I'm about to start using it again after I go through a tank w/ new plugs.

NmexMAX

iTrader: (22)

Moral of the story, get a WB.

My plugs look just like yours.

I'm running perfect right now. 3" MAF, 440's. 14.7 idle, 12.8-13.0 WOT. AFC 1/1.

Flava_24/7

iTrader: (46)

Those plugs look fine, my plugs have always looked like those.
The plugs ABIGBRAIN posted look as if a fuel additive was being used but the porcelain and electrodes look fine.
Running a straight exhaust with no cats resulted in backfires with me also.