my emisions test results help
Thread Starter
Pro
Joined: Oct 2005
Posts: 557
Likes: 1
From: Ottawa Ontario
my emisions test results help
Got the car safety checked for the road. Front pads and roters only. Very good. The mandatory emisions test passed the CO but failed on the NO. I read the brochure on NO and it points to a possible egr or convertor.
I called my brother in law ( a very reputable porsche audi mechanic) and explained this. I asked him about putting the "ahem" additive to get it to pass. He said that it wouldn't help that they are going to find a bad cat. It won't be the egr and the motors not carboned up.
Is he just about right on there? The cars been in storage for the winter,( 3 months) and is running beautifully. the motor only has 30k on it. It has stabil in the fuel which is reasonably fresh. He says all that should be ok and it will be a problem with a cat. Any comments or anyone else have this issue?
I called my brother in law ( a very reputable porsche audi mechanic) and explained this. I asked him about putting the "ahem" additive to get it to pass. He said that it wouldn't help that they are going to find a bad cat. It won't be the egr and the motors not carboned up.
Is he just about right on there? The cars been in storage for the winter,( 3 months) and is running beautifully. the motor only has 30k on it. It has stabil in the fuel which is reasonably fresh. He says all that should be ok and it will be a problem with a cat. Any comments or anyone else have this issue?
Thread Starter
Pro
Joined: Oct 2005
Posts: 557
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From: Ottawa Ontario
Its a 92 LT1. I just went back over to the garage and took the car out and hammered it bigtime up and down the freeway. Luckily I didn't get caught I musta been doing over 100mph in places. Put a hot of heat in the convertors and then took it back to get retested. Hopefully it will pass now.
All you guys still in storage get em out! I had a smile so wide I near cracked my face open. Car was just bitchin fast and I blew off pretty quick a rice burner that tried me on throttle roll on. I just snicked it down into fourth and rolled it on and away.
Think i may need a clutch soon though. She's a bit whinny when its not depressed at a stoplight. I was very happy with all the guage readings too.
All you guys still in storage get em out! I had a smile so wide I near cracked my face open. Car was just bitchin fast and I blew off pretty quick a rice burner that tried me on throttle roll on. I just snicked it down into fourth and rolled it on and away.
Think i may need a clutch soon though. She's a bit whinny when its not depressed at a stoplight. I was very happy with all the guage readings too.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
heat is your friend.
if you have bad NOX, I would check the EGR side of things. There is a pipe that goes from the right exhaust manifold to the intake. That pipe CAN crack at the brazed joint. If that is cracked, NOX becomes hit and miss...
Don't blame the cat until you are sure.
And from where I sit, I am still not sure that NOX is effected by the cat. I need to do research.
if you have bad NOX, I would check the EGR side of things. There is a pipe that goes from the right exhaust manifold to the intake. That pipe CAN crack at the brazed joint. If that is cracked, NOX becomes hit and miss...
Don't blame the cat until you are sure.
And from where I sit, I am still not sure that NOX is effected by the cat. I need to do research.
Race Director
Joined: Sep 2005
Posts: 13,269
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From: Sharpsburg Georgia
GA Events Coordinator
Originally Posted by bogus
And from where I sit, I am still not sure that NOX is effected by the cat. I need to do research.
Do not trust me on this, check it out for your self.
I have seen it hundreds of times.
Greg N
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Thread Starter
Pro
Joined: Oct 2005
Posts: 557
Likes: 1
From: Ottawa Ontario
Great stuff and thank you. I'm still hoping its because the car was sitting for three months. Lot of water vapour came out the exhaust pipes for a bit. It should be clean now. I hope they know enough to test it hot.
If not I'll check that pipe. They already found a cracked vacuum line and replaced that.
Pat.
If not I'll check that pipe. They already found a cracked vacuum line and replaced that.
Pat.
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Burning Brakes
Joined: Nov 2005
Posts: 848
Likes: 1
From: 1992 LT1 6 speed Cayman Islands
Originally Posted by bogus
heat is your friend.
if you have bad NOX, I would check the EGR side of things. There is a pipe that goes from the right exhaust manifold to the intake. That pipe CAN crack at the brazed joint. If that is cracked, NOX becomes hit and miss...
Don't blame the cat until you are sure.
And from where I sit, I am still not sure that NOX is effected by the cat. I need to do research.
if you have bad NOX, I would check the EGR side of things. There is a pipe that goes from the right exhaust manifold to the intake. That pipe CAN crack at the brazed joint. If that is cracked, NOX becomes hit and miss...
Don't blame the cat until you are sure.
And from where I sit, I am still not sure that NOX is effected by the cat. I need to do research.
The chemicals in the substrate inside the cat removes oxygen from the NOX and turns it into nitrogen and oxygen. It does break down the NOX
Race Director
Joined: Sep 2005
Posts: 13,269
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From: Sharpsburg Georgia
GA Events Coordinator
Originally Posted by bogus
Race Director
Joined: Sep 2005
Posts: 13,269
Likes: 0
From: Sharpsburg Georgia
GA Events Coordinator
Originally Posted by Mr. Peabody
If you've got an LT1 you want to drive that sucker for a good hour before you go in for your sniffer test. Like Andy said heat is your friend.
A hot motor will help lower HC's but it will make NOX higher.
Le Mans Master
Joined: Oct 2004
Posts: 7,706
Likes: 485
From: Everett WA
C4 of Year Finalist (appearance mods) 2019
Originally Posted by blown87
Heat is not your friend if you are trying to get a NOX reading down.
A hot motor will help lower HC's but it will make NOX higher.
A hot motor will help lower HC's but it will make NOX higher.
