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Author
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Topic: Excessive HC emissions
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86GT_Hatch_Pearl
New Member
Member # 13762
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posted
 
 
Just took my 86 GT for smog the other day. NOx and CO were just fine, but HC was about 30 ppm over the max limit. I had a similar issue last time, replaced the EGR vacuum control solenoid and solved the issue. I did an ignition tune-up less than 5 months ago, I doubt the plugs are that fouled. I also recently replaced the smog pump. I was thinking of replacing the solenoid again and possibly the EGR valve itself. Any suggestions or thoughts?
Posts: 7 | From: San Jose | Registered: Sep 2014
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hurting your feelings
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Member # 13641
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posted
Drive the piss out off it an the hc should drop the catalyst most likely warmed all the way or the car cooled down.
Posts: 1830 | From: In front of the bank with a 45 an a ski mask | Registered: Jun 2014
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3cRider
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Member # 10052
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posted
I believe Ca lowered the limits a few years ago (I don't know if it was NOX, CO, and hydrocarbons or just one of them) and it's only gotten harder to pass. Cars that once passed with a good margin suddenly don't have as much wiggle room.
But like Hurting your feelings said, get the cats good and hot! Some have even thermal wrapped them to ensure they stay hot.
[ 2014-12-13, 03:18 PM: Message edited by: 3cRider ]
Posts: 91 | Registered: Jun 2010
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SacStangDriver
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Member # 8304
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posted
if you got a friend who is a smog tech. pull the spout connector and it sho uld pass
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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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Tom Renzo
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Member # 13165
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posted
Install a dummy spout connector and go through emissions
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I spend money i don't have. Building cars i don't need. To impress people i don't know.
Posts: 557 | From: CT | Registered: Sep 2013
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hurting your feelings
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Member # 13641
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posted
Just drive the shit out of it an when show up to the smog shop have smog right away.it failed because the catalytic converter's had time to cool down.
Posts: 1830 | From: In front of the bank with a 45 an a ski mask | Registered: Jun 2014
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SacStangDriver
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Member # 8304
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posted
tom renzo! never thought of this. thanks.
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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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hurting your feelings
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Member # 13641
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posted
quote:
Originally posted by SacStangDriver:
tom renzo! never thought of this. thanks.
You can cut the wire going to the connector an install but connector's so you only have to un-hook the wire when smogging the car.
Posts: 1830 | From: In front of the bank with a 45 an a ski mask | Registered: Jun 2014
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dohcfox
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Member # 12829
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posted
Too rich.
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97 mustang track car
57 f100 built on 06 Lincoln navigator frame
83 elcamino d.d.
64 ford galaxie
Porsche turbo
Posts: 139 | Registered: Apr 2013
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86GT_Hatch_Pearl
New Member
Member # 13762
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posted
Failed again! Cleaned out the EGR valve, check valves, throttle body and the spark plugs and ran 101 octane unleaded race fuel from 76...it dropped HC emissions, but not enough to pass. Still 10 ppm over the limit. I drove the car for about 20 miles and didn't shut the engine off until the smog tech took it. I'm starting to wonder if that loose wire my buddy found in my spout connector was my savings grace at the last smog check. This is rather frustrating.
Posts: 7 | From: San Jose | Registered: Sep 2014
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hurting your feelings
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Member # 13641
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posted
Driving for 20 minutes will not get the cats hot enough drive hard for about a hour.
Posts: 1830 | From: In front of the bank with a 45 an a ski mask | Registered: Jun 2014
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Tom Renzo
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Member # 13165
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posted
Not to rich it can be lean and increase the numbers as well. Normally advanced timing can do it and removing the spout will let you sail through the test if your engine is in good shape with no other issues. Did you disable the SPOUT ????????????? Everything you did prior to the test was useless as you found out. HC is unburnt fuel. Your timing is to high. Fudge the spout and or reduce the timing. Not sure if CA checks base timing i think they do. DID YOU DISABLE THE SPOUT>>> YES>>> NO ???
[ 2014-12-24, 02:45 AM: Message edited by: Tom Renzo ]
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I spend money i don't have. Building cars i don't need. To impress people i don't know.
Posts: 557 | From: CT | Registered: Sep 2013
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hurting your feelings
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Member # 13641
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posted
Yes we check the timing.
Posts: 1830 | From: In front of the bank with a 45 an a ski mask | Registered: Jun 2014
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86GT_Hatch_Pearl
New Member
Member # 13762
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posted
No, I didn't disable the spout. I'll do that the next time I go, since all I have to do is pull the wire slightly out of the connector's socket. ..its already loose.
Posts: 7 | From: San Jose | Registered: Sep 2014
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86GT_Hatch_Pearl
New Member
Member # 13762
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posted
No, I didn't disable the spout. I'll do that the next time I go, since all I have to do is pull the wire slightly out of the connector's socket. ..its already loose. Base timing is at 10 degrees.
[ 2014-12-24, 11:23 AM: Message edited by: 86GT_Hatch_Pearl ]
Posts: 7 | From: San Jose | Registered: Sep 2014
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86GT_Hatch_Pearl
New Member
Member # 13762
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posted
[ 2014-12-24, 11:20 AM: Message edited by: 86GT_Hatch_Pearl ]
Posts: 7 | From: San Jose | Registered: Sep 2014
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rollininmy50
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Member # 9067
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posted
Is this a stock motor? There is a tube that connects both heads together , back side against fire wall, is this tube free flowing? Blow threw it, 9 out of ten cars looked at the tube is clogged . Plus Where this tube connects to at the heads could be clogged as well. If your car cannot breath it will fail. If the car is stock the timing should be at 10' , you don't need 101 octane to smog a car, if it was manufactured with 89 octane that's what you use. Period. Many of stangs have failed due to thats mission tube on the back of the motor.
Posts: 439 | From: sactown | Registered: Apr 2009
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86GT_Hatch_Pearl
New Member
Member # 13762
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posted
Well, the spout connector bit didn't work, it only made it worse. Looks like I need some new cats. It's something of a bummer, since I replaced the two main cats approximately 7 years ago. I'd go with magnaflow's direct-fit CARB legal piece, but the cost is a little out of my price range. I can only hope my muffler shop can work some magic with the stock H-pipe again for a reasonable price.
Posts: 7 | From: San Jose | Registered: Sep 2014
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Tom Renzo
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Member # 13165
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posted
I find that hard to believe. reducing the timing will always decrease HC significantly.
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I spend money i don't have. Building cars i don't need. To impress people i don't know.
Posts: 557 | From: CT | Registered: Sep 2013
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86GT_Hatch_Pearl
New Member
Member # 13762
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posted
I thought it was strange, too. What you said made perfect sense. When disabled, the HC levels rose slightly more (135 ppm) and CO was readable..reconnected it and ran it again, HC went back down to about 126 and CO down to 0. Something strange about this. Combination of sensors and cats, maybe. I could smell the unburnt gas in the exhaust when it was on the dyno.
Posts: 7 | From: San Jose | Registered: Sep 2014
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