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Author
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Topic: Failed smog, need advice
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stangin'
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Member # 514
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posted
 
 
My friend's 93 GT just failed smog yesterday so now we're in the process of trying to trace things down.
The car has your basic HCI setup and running through a bassani x-pipe. What's usually the culprit for high HC and NOx that we should look at? After it failed both the 15 and 25mph test, I asked the tech to try something so I took out the timing spout out. This made it pass HC, but NOx was still really high.
Posts: 2993 | From: Bay Area | Registered: Oct 2001
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SLOWSN95
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Member # 8269
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posted
Looks like it's running lean. Call the BAR. They will help you out with the problem. That's what I did. The number should be on the smog test paper
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94' GT
347 Stroker
MM Suspended
2003 SB SVT Lightning
Pullied and Lowered
89'Hatch-SOLD
Posts: 2214 | From: 510/east bay | Registered: Mar 2008
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iceman302
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Member # 7180
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posted
Check vacuum lines. Check the fuel pressure regulator. Something is causing it to run lean to generate high NOx.
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'65 Mustang Fastback
Posts: 4171 | From: Rancho Murieta | Registered: Oct 2006
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theconductor
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Member # 13458
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posted
Does Bassani make a CA legal x-pipe?
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Woke Bruh
Posts: 349 | From: Roseville, CA | Registered: Feb 2014
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H8RPWRD
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Member # 12588
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posted
quote:
Originally posted by theconductor:
Does Bassani make a CA legal x-pipe?
No x-pipe is ca legal
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89 Lx Vert
93 LX Notch- sold
01 Bullitt #00919- Sold
90 LX- Sold
89 LX Vert- Sold
89 LX (DarkHorse)-Sold
Posts: 1330 | From: Hayward | Registered: Dec 2012
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phildog
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Member # 1214
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posted
Magnaflow makes a CARB legal x-pipe with 4 cats. Pretty expensive and the passenger side tube takes a wicked bend and thus hangs pretty low. But it is CARB legal.
Posts: 1554 | From: 510 | Registered: Apr 2002
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351w
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Member # 11875
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posted
Neight
Posts: 1018 | From: 510 | Registered: Apr 2012
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NEIGHT
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Member # 8741
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posted
quote:
Originally posted by TEXAS:
Neight
I sell strawberries now bro. Check me out in my hustle under my avatar. ![[patriot]](graemlins/patriot.gif)
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-Savage Habits-
1992 Summer Edition
1986 Hatch- catfish killer
1964 Impala hard top
Posts: 18529 | From: EA$T $IDE REDWOOD CITY | Registered: Nov 2008
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stangin'
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Member # 514
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posted
thanks guys, i'll look into this lean issue more.
neight, quit selling those strawberries and get you stuff back from Dan.
Posts: 2993 | From: Bay Area | Registered: Oct 2001
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MaK_1967v8
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Member # 12187
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posted
quote:
Originally posted by FiveOhChuck:
quote:
Originally posted by theconductor:
Does Bassani make a CA legal x-pipe?
No x-pipe is ca legal
Not exactly correct information. Magnaflow sells a smog legal X pipe. ( 4 stock OEM replacement cats with their typical X pipe in the center ) But its also a pretty penny. ( stainless steel piping combined with magnaflows overpriced shenanigans )
your best bet is to simply track down a stock H pipe.
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1967 C Code Coupe
2004 Roush Stage 2
Posts: 620 | From: Sacramento, CA | Registered: Jul 2012
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stangin'
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Member # 514
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posted
quote:
Originally posted by MaK_1967v8:
quote:
Originally posted by FiveOhChuck:
quote:
Originally posted by theconductor:
Does Bassani make a CA legal x-pipe?
No x-pipe is ca legal
Not exactly correct information. Magnaflow sells a smog legal X pipe. ( 4 stock OEM replacement cats with their typical X pipe in the center ) But its also a pretty penny. ( stainless steel piping combined with magnaflows overpriced shenanigans )
your best bet is to simply track down a stock H pipe.
running lean isn't a cat issue.
Posts: 2993 | From: Bay Area | Registered: Oct 2001
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SacStangDriver
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Member # 8304
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posted
nox deals with EGR andlean conditions. i'd check egr system first.
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Need sidework done at great prices? I work on all makes and models from engine work to gears. Check engine light problems too. 916 912 3493
Posts: 1217 | From: sacramento | Registered: Mar 2008
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FivePTSlow
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Member # 7682
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posted
If your nox reading is that high I can guarantee you one thing. You need cats. You can have a completely inoperative egr system with good cats your nox will not be anywhere near those numbers.
I've been down this road very recently. Had to buy new cats. I tried everything else first. New vacuum hoses everywhere, new egr valve, new egr vacuum solenoid, full tune up(spark plugs/wires, o2 sensors etc), all new fluids, pull timing spout, retard timing, PCV valve, so on and so on. All of that did nothing to reduce my emissions. My car was failing only nox, passed everything else. Once the cats were replaced my nox emissions dropped to nearly 0 ppm
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2011 GT/CS 5.0 + Boost(Procharger)
90 Bronco 5.8 Lifted
05 SRT-4 24PSI E-85 at least 50 million hp
07 Harley VROD NRS Stage 1
Posts: 1857 | From: Sacramento | Registered: May 2007
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stangin'
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Member # 514
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posted
I still haven't had much time to mess with the car, but today I ran a code scan.
KOEO - passed
KOER - 91 and 12, 13 for high rpm idle.
There's no check engine light on normal driving. Can a bad o2 sensor make the car fail this bad?
I also noticed on the car that there's no vacuum hose on the AFRP ![[Confused]](confused.gif) . The port is just left open. How does this affect performance? Where should the hose off the FPR be connected to?
Posts: 2993 | From: Bay Area | Registered: Oct 2001
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iceman302
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Member # 7180
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posted
The missing vacuum line to the FPR would definitely cause the symptoms you've mentioned. It's been a few years since I've worked on a Fox but the vacuum line for the FPR is a short, fitted line that runs to the vacuum "tree" on the back of the upper intake manifold.
After fixing that, I'd verify that the other vacuum lines are run properly... especially to the EGR solenoid. Hope that helps.
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'65 Mustang Fastback
Posts: 4171 | From: Rancho Murieta | Registered: Oct 2006
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