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bogus | Failed Smog....UPDATED!!! PASSED SMOG!!! | ||
Grand Imperial Pooh-Bah
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Rather surprising, really...
92 Coupe, LT1 (from a 96), new California legal Magnaflow cats, LTCC. It ran real lean at 25 MPH. The NoX went nuts... went from 300 and something @ 15 MPH to 650 at 25 MPH. The Lambda calculator indicates lean. I am thinking: 1. Bad vacuum to the EGR 2. The air pump, being disconnected, isn't helping 3. Loose O2 sensors |
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Posted on: 2014/10/10 15:59
Edited by bogus on 2014/10/18 22:34:50 |
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Matatk | Re: Failed Smog.... | ||
Webmaster
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Posted on: 2014/10/10 18:03
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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BrianCunningham | Re: Failed Smog.... | ||
Senior Guru
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for a second I thought they gave you grief about the LTCC
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Posted on: 2014/10/10 23:22
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Polo Green 95 LT1 6-spd http://mysite.verizon.net/vzevcp74/ 383 LT1/Vortech Supercharger/AFR heads/Rod end suspension/Penske-Hardbar dual rate coilovers/Wilwood 6pot brakes NCCC Governor: http://BayStateCorvetteClub.com |
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Schrade | Re: Failed Smog.... | ||
Elite Guru
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Quote:
Lean burn = hot burn; hi NOx's. Lean burn could be 'rich' (long pulsewidth), with poor atomization from low fuel pressure, and confused O2 readout... |
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Posted on: 2014/10/11 2:59
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bogus | Re: Failed Smog.... | ||
Grand Imperial Pooh-Bah
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Quote:
They do... but normally, it passes with flying colours... I think that my assessment is correct. I am going to check vacuum to the EGR, then check the fuel pressure... It might be low, if so, that would cause this. I was adjusting down to compensate for the different flow rates of the various injectors... but I don't think I need to do that with these newer style matched injectors. Also, make sure the air pump is up and running ok. |
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Posted on: 2014/10/11 15:40
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istter1 | Re: Failed Smog.... | ||
Elite Guru
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Like we in California say welcome DMV loves you. make sure the air pump is up and running.
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Posted on: 2014/10/11 18:29
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bogus | Re: Failed Smog.... | ||
Grand Imperial Pooh-Bah
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no kidding...
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Posted on: 2014/10/11 18:40
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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bogus | Re: Failed Smog.... | ||
Grand Imperial Pooh-Bah
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ok... checked lotsa stuff, still one more thing to check.
However, the various vacuum lines that feed to the EGR were compromised. The hard line was fitted to a rubber line, and the rubber line was just big enough to not allow a seal to occur. If I was losing vacuum around that connection, well, gee, by all means, I had a problem! |
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Posted on: 2014/10/11 22:33
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istter1 | Re: Failed Smog.... | ||
Elite Guru
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Quote:
Good luck at the retest |
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Posted on: 2014/10/14 4:04
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Schrade | Re: Failed Smog.... | ||
Elite Guru
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Quote:
Are you sure that EGR vac supply was 'broken'? Seems to me that ECM looks for vacuum to hold for x seconds (with EGR solenoid valve closed (or open?) ), and if it doesn't hold for x seconds, then you get a 32 DTC SES, or it comes up as H DTC... Isn't that how it operates? |
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Posted on: 2014/10/15 12:39
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LT5, Marc Haibeck ECM module, AUTOMATIC!!! |
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bogus | Re: Failed Smog.... | ||
Grand Imperial Pooh-Bah
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To a degree, but if the bleed off is so slow, it might not notice...
At the same time, I am going to ramp up the fuel pressure. If that's a touch low, then it will cause a lean condition. |
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Posted on: 2014/10/15 20:03
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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NelsonV | Re: Failed Smog.... | ||
Senior Guru
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Codes? Or just failed the sniffer/dyno? I have your scanner in my trunk.
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Posted on: 2014/10/16 0:03
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bogus | Re: Failed Smog.... | ||
Grand Imperial Pooh-Bah
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that scanner won't help my Vette... It helps the suburban... thanks, tho.
no codes, just a rise in NoX and a failed test. |
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Posted on: 2014/10/16 1:11
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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Schrade | Re: Failed Smog.... | ||
Elite Guru
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Quote:
Maybe before adjusting fuel pressure (you have adjustable FPR?) , note that ANY vac leak will affect stock FPR response to fuel pressure. Fuel pressure is critical to get good atomization... |
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Posted on: 2014/10/16 12:46
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LT5, Marc Haibeck ECM module, AUTOMATIC!!! |
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bogus | Re: Failed Smog.... | ||
Grand Imperial Pooh-Bah
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That's my next test... and yes, I have an AFPR, with a dedicated gauge on the fuel rail.
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Posted on: 2014/10/16 15:58
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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BrianCunningham | Re: Failed Smog.... | ||
Senior Guru
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Posted on: 2014/10/16 20:16
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_________________
Polo Green 95 LT1 6-spd http://mysite.verizon.net/vzevcp74/ 383 LT1/Vortech Supercharger/AFR heads/Rod end suspension/Penske-Hardbar dual rate coilovers/Wilwood 6pot brakes NCCC Governor: http://BayStateCorvetteClub.com |
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bogus | Re: Failed Smog.... | ||
Grand Imperial Pooh-Bah
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I have "new" magnaflows... under 2 years old, 15k miles, CA OBDII compliant. They better work...
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Posted on: 2014/10/16 23:44
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_________________
The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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istter1 | Re: Failed Smog.... | ||
Elite Guru
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I am curious to see how the new Exhaust system with one less cat works. in California. We have crazy rules/87 has
two pre cats and the third that collects garbage. The California cat tax stamp is a joke. If your smog guy can't pass it just drive up north Andy and see my smog guy |
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Posted on: 2014/10/17 3:14
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Only I can change my life. No one can do it for me. Carol Burnett |
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bogus | Re: Failed Smog.... | ||
Grand Imperial Pooh-Bah
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Oh, I will pass... no question about that!
The LT1, LT4 and LT5 have one cat on each bank. I hate the L98 setup... |
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Posted on: 2014/10/17 5:47
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_________________
The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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Matatk | Re: Failed Smog.... | ||
Webmaster
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Quote:
Double check that gauge. I had one that was 8 psi low and it was driving me nuts trying to troubleshoot the problem when it was the gauge all along. |
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Posted on: 2014/10/17 11:43
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_________________
2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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bogus | Re: Failed Smog.... | ||
Grand Imperial Pooh-Bah
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it passed. Very nicely.
I am pretty sure it was the vacuum line, if nothing else, it was introducing more air into th intake. |
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Posted on: 2014/10/18 20:26
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_________________
The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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istter1 | Re: Failed Smog.... | ||
Elite Guru
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Quote:
Well done Andy |
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Posted on: 2014/10/19 1:04
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Only I can change my life. No one can do it for me. Carol Burnett |
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bogus | Re: Failed Smog....UPDATED!!! PASSED SMOG!!! | ||
Grand Imperial Pooh-Bah
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thanks!
Can't over think this stuff, ya know? |
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Posted on: 2014/10/20 16:31
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_________________
The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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