In need of a Z guy's help

[1Dreamer]

I need some help with getting my car through emissions, I'm hoping there's a Z guy here that will be willing to help me out (i'm willing to pay you) getting it to pass...I'm thinking it's the EGR valve, vacuum leaks, and/or just an old dirty motor...

techs around here suck (or maybe i just haven't found the right ones, all they suggested is getting either a $100 diagnostic or just getting a tune up...i can't argue with the tune up, as i knew i would fail emissions before i went (just bought the car 2 weeks ago and previous owner told me it wouldn't pass...

the results from test:

HC-2.07 out of 1.00
CO- 13.26 out of 12.00
NOX- 7.67 out of 2.50 (danm!)

If there's a z guy out here (E Baseline RD)

[1Dreamer]

Just went out to look around the motor for possible f*** ups in the hoses and such...and found this (not sure if it's seriously bad because i've never seen this type of s*** before.....

Previous owner has a couple hoses plugged with little bolts....wtf? will this cause some of the emissions to be failed?





Why is that spring moist on this side (passenger side) and not on the driver side?

[z32loverboy]

Looks like a backyard vaccum line delete. IIRC those go under the intake manifold and connect to each other. I deleted mine but used vaccum caps to cap them off. You can get them at any auto parts store to cap them off "right" and make yourself feel better about them. Ohm test your injectors and make sure they're still good, clean your MAF(mass airflow meter), check your ECU codes, replace your spark plugs and see what those come out to. the injectors are supposed to have around 14 Ohms of resistance. Let us know what you come up with doing those tests and you can go from there. My money would be on the O2 sensors and/or the EGR as well. Your ECU will throw codes to tell you whats wrong.

[1Dreamer]

Previous owner swapped out the spark plugs and the o2 senors...

so would this "backyard" delete cause a high NOx like what i have above?

[ThisIsSparTTa]

OMG someone doesn't know how couplers work for those hardpipes. Injen pipes w/ couplers already have poor fitment. With them on like that I'm suprised you don't have some serious leaks. Wouldn't affect your emissions, but damn. Also, capping unused vacuum lines is fine, they just did it the ghetto way. You can go grab vacuum caps from the parts store for cheap.

Otherwise, same advice as always for passing emissions. You'll need cats. Run your engine hard and make sure everything is warmed up before going in. You can create a vacuum leak off the balance tube by using a T-fitting and running the open end of the hose down a little so its not obvious something is disconnected. This will lean you out and help you pass. Do it right before you go to the shop, and take it back off afterwards. This has worked for lots of people.

[nexus08]

Based on how low the VOC is, and how high the NOx is, I'd say it is bad cat problem.

If you were running rich, the VOC's would be high.

The CO is close, but highish.

The Cats react the CO/VOC's with NOx to get rid of both. Looks like nothing is getting rid of the NOx.

Also, did someone do an ERG delete on it? The purpose of the EGR is to lower the combustion temp which greatly lowers the NOx.

[1Dreamer]

I'm not sure on what was deleted, A couple guys from PZ32 is gonna come by and help me out a bit today, I'm gonna change the oil so while i have the car lifted i may try and drop the exhaust to take a look at the cats....what should i look for inside of them to know if their bad or not

[300ZXttZMAN]

What city and state are you in?

[nexus08]

I'm not sure on what was deleted, A couple guys from PZ32 is gonna come by and help me out a bit today, I'm gonna change the oil so while i have the car lifted i may try and drop the exhaust to take a look at the cats....what should i look for inside of them to know if their bad or not

I doubt you will be able to see anything since the bad stuff happens to the cats on the other side, the side you can't see. However, if they are REAL bad, you might be able to see if they are broken up from the side you can see.

I'm in the process of replacing my catalytic converters now, and have taken one side off. From the side I could see there was no obvious problems. However, when I had it off, and tipped it up about 1 cup of "chunks" of catalyst came out the other end.

[1Dreamer]

What city and state are you in?

Phoenix, Arizona

[Z-owned]

I would run some crc guaranteed to pass in the gas tank as it suggests should be able to find it at your auto parts store. I have had both the Z and my corrado pass with it and neither has cat's and both failed before using it. Obviously the best solution would be to figure out why it's not passing to begin with though.

[1Dreamer]

I forgot completely about that stuff...just called up autozone and the have it in stock...

I still need to clean my filter, change the spark plugs (to the right ones) and i'll throw that in my tank and give it a go again in a week or so.

Thanks fellas

[300ZXttZMAN]

What city and state are you in?

Phoenix, Arizona

Ok get in touch with Anthony @ Zdreamz in Phoenix, AZ.

I'm going to page him to look at this thread.

[ruslan300]

The hose of balance tube goes to the aiv solenoid . The one on passenger side goes to egr solenoid and the driver side goes to prvr solenoid and if there all blocked off, that means there by passed. With out them you wont pass emissions.

[Z-owned]

The hose of balance tube goes to the aiv solenoid . The one on passenger side goes to egr solenoid and the driver side goes to prvr solenoid and if there all blocked off, that means there by passed. With out them you wont pass emissions.

It's possible with a healthy engine as long as the main cat's are there. I have all the deletes and pass with just my cats in. This last time I passed with no cat's though with simply running the crc guaranteed to pass through most a tank. I am not one for a lot of additives but I have used it twice now on two different car's and passed both times without cat's on either of the car's so I do believe it works.

[ThisIsSparTTa]

The hose of balance tube goes to the aiv solenoid . The one on passenger side goes to egr solenoid and the driver side goes to prvr solenoid and if there all blocked off, that means there by passed. With out them you wont pass emissions.

300ZX AIV's failed a long time ago, plenty of people are passing without them. PRVR has nothing to do with emissions. EGR does, but depending on where you are you can still pass without it.

A better look at the vacuum diagrams if you're curious: http://z32.wikispaces.com/Vacuum+Diagrams

What is this CRC Guaranteed stuff? I've never heard of it. Have lots of people used it in their cars? Is it safe for our injectors, fuel lines, etc?

[300ZXttZMAN]

Bump. Any update 1dreamer?

[1Dreamer]

Bump. Any update 1dreamer?

Nothing as of yet, I know my filter is filthy so I'm gonna clean that when I get home today. I'm considering just doing that and running the crc and going straight to emissions that way, then take care of the plugs afterward.

I'll update this thread once I hit emissions (which will likely be sat the 5th) and let you guys know the results.

By the way for those who have experience with the crc garanteed to pass stuff, do you run through emissions while it's still iN or do you run in through?

[1Dreamer]

The hose of balance tube goes to the aiv solenoid . The one on passenger side goes to egr solenoid and the driver side goes to prvr solenoid and if there all blocked off, that means there by passed. With out them you wont pass emissions.

What is this CRC Guaranteed stuff? I've never heard of it. Have lots of people used it in their cars? Is it safe for our injectors, fuel lines, etc?

It's a fuel additive that came out around 2004 I believe once the gov started with the emissions s***. I'm not sure exactly what it does but every time Ive hear of people using it they pass with flying colors. All by pouring a bottles worth in a "low" tank of gas. One bottle = $12 bucks at my closest autozone here in Phoenix

[Z-owned]

Add it to a tank when you fill up and run it in the car till your about down to a quarter tank then refill and go do emissions. Obviously make sure the car is warmed up before testing.

[DCaff300ZX]

What is this CRC Guaranteed stuff? I've never heard of it.

News to me as well, I will keep this in mind!

[nexus08]

What is this CRC Guaranteed stuff? I've never heard of it.

News to me as well, I will keep this in mind!

I'm not exactly sure what it is, but I'm betting it is an oxygent (not really sure that's a word but you know what I mean) that increases the oxygen in the fuel which helps the fuel burn more completely.

Again I don't know for sure, but this would be fine in states that only test for CO and VOC like where I live. But I'm betting it won't help, and might hurt, NOx measurements by making the fuel burn faster/hotter which will increase NOx. So in a state like the OP's where they measure NOx too, it might not help as much.

Just making some educated guesses ... if someone in Cali has used it for NOx maybe they can chime in.

My bet is the main problem is the EGR delete.

[1Dreamer]

Deleted.

[1Dreamer]

Courtesy of google:
"February 2012
Nope. But I looked it up and it's just a fuel system cleaner. With "powerful emulsifiers". An emulsifier just causes one liquid to break up and be suspended in another liquid. I suspect they mean that it enables anything cleaned out of the system to be suspended in the fuel and burned."