How come I can't pass smog?
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Supreme Member
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Joined: Sep 2003
Posts: 10,494
Likes: 3
From: Woodland, CA
Car: '02 Z06
Engine: L33 5.7
Transmission: T56
Axle/Gears: Stock IRS
How come I can't pass smog?
Luckily, the smog tech let me snap a picture of the numbers at idle, Perhaps you guys can help me figure out what is wrong?
I don't know where to begin.
I don't know where to begin.
Joined: May 2004
Posts: 2,262
Likes: 1
From: houston
Car: 83 POS monte carlo 2015 chevy P/U
Engine: 92 5.7 tpi 5.3
Transmission: 700r4 6L60E
Axle/Gears: 2.42 too high
you are way too rich, you may be getting some rich misfire with the O2 so high, but normally that starts when CO is up around 9.0~10.0 or more.
you need your CO down around 1.0~1.5 max with out the cat.
some things to check, is the motor getting to operating temp?
check your coolant sensor, air temp sensor, O2 sensor, fuel pressure.
check for any misfiring on the side of the motor the O2 sensor is on.
also, after you get your CO down, pull your plugs & make sure they aren't fouled out.
you need your CO down around 1.0~1.5 max with out the cat.
some things to check, is the motor getting to operating temp?
check your coolant sensor, air temp sensor, O2 sensor, fuel pressure.
check for any misfiring on the side of the motor the O2 sensor is on.
also, after you get your CO down, pull your plugs & make sure they aren't fouled out.
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Supreme Member
Joined: Jul 2005
Posts: 1,675
Likes: 3
From: Arab, Alabama
Car: 1988 Trans Am GTA
Engine: 350 4BBL
Transmission: 700R4
Axle/Gears: 3.27
Thread Starter
Supreme Member
iTrader: (2)
Joined: Sep 2003
Posts: 10,494
Likes: 3
From: Woodland, CA
Car: '02 Z06
Engine: L33 5.7
Transmission: T56
Axle/Gears: Stock IRS
The stealth ram doesn't have egr so I don't have one of them anymore. and I removed the smog pump to free some horsepower, Thinking perhaps it would only help the situation.
Supreme Member
Joined: Jul 2005
Posts: 1,675
Likes: 3
From: Arab, Alabama
Car: 1988 Trans Am GTA
Engine: 350 4BBL
Transmission: 700R4
Axle/Gears: 3.27
Yep. A whole 1/3 of a horsepower at redline. You should live here in Alabama. Makes as much sense as an A/C delete pulley. When the A/C compressor clutch is disengaged the pulley is an idler pulley. If you want to save weight move the battery to the trunk instead of pitching the compressor. The battery is a whopping 25 lbs as opposed to 8 lbs and it helps traction back there. You can have full horsepower and still keep from sweating with a simple A/C WOT cutout switch. And while you're at it, you can do like me and have it sleep the alternator at WOT freeing up about 5 horsepower.
Now, that is a meaningful amount.
(I'm glad I don't have to deal with smog stuff)
Now, that is a meaningful amount.
(I'm glad I don't have to deal with smog stuff)

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