Failed smog on 1988 with 350 TBI

[Frankenchevy]

Unfortunately you have to swap the entirety of the emissions controls from whatever it is. So he would likely have to swap in a flex fuel system from a 2004 or later equivalent Tahoe/Burb. That would probably require engine/trans/fuel line and tank mods/entire exhaust from manifolds to cats from the swap vehicle. Then you have to have the VIN from the swap vehicle and take the whole thing to a SMOG referee to have it signed off.

Yes, it’s much easier to buy a property in a smog exempt county than go through all that malarkey.

 

[HotRodPC]

Iirc it was high rpm. He didn’t log it, so I didn’t get a printout. I just remember the 1.6% CO at 2500rpm was the problem.

Failing here escalates things quickly, so he’s basically hooking me up to the sniffer to help me get it figured out before the actual test. No dyno, just two speed (idle and 2500rpm).

That's awesome of him, and to not log it too. Cuz I'm pretty sure if he logs it, it goes to the State of Cali and then they'd have a record of the fail. Good on him to keep you a clean record on that truck. That's Awesome.

 

[HotRodPC]

Smog testing is only applicable to 1976 and newer vehicles, so I’m not so sure about antiques. Though, I do have to keep in mind that in other parts of the country that something from 1976 surviving the rust is an antique.

I did ask the Internet if a higher ethanol content reduces CO percentage, and it confirmed that it does in fact result in lower carbon monoxide. Though, I asked a follow up question and it gave me an incorrect response on some basic math, so I’m not so sure how much I trust the question I previously posed about carbon monoxide. Honestly, it’s been a long time since I had chemistry so I would have to think about that for a little while, but it sounds correct.

The follow up question was due to the fact that we do not have E 20 blends available at the pump. There are however, a few gas stations about an hour away that have E 85. I could theoretically put 6 1/2 gallons of E 10 to every 1 gallon of E 85 to achieve an E20 blend.

The first time asking it lied and tried to trick me into using E47.5.

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Always question AI people!

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Quite possible, and this is the part that I’m not sure on at all, and therefore would not roll the dice on my next inspection, I am not sure that the rudimentary TBI computer would react appropriately to a higher ethanol blend.

And don't forget this, That ALL DIESELS by VIN #, since the VIN designates to the state that you have a 6.2 truck, NO SMOG Required. So you find you an ORIGINAL 6.2 Squarebody, and you put the nastiest, dirtiest, biggest cam engine you can in that pig and drive the hell out of it with pride. BTW, I think this works up until 1996. So even if you had a 6.5 GMT400 truck, you are EXEMPT from Smog in Cali. This is exactly why I have NEVER sold and NEVER gave up on my K10 to K20 conversion build truck. I thought, if I ever move back to Cali, that truck is going with me and it'll be ugly ugly on the sniffer. But they'll never know it. Sadly, I hear that in itself, being a 6.2 truck, runs the price up in Cali cuz people will pay more for them just to get out of smog testing. Might have to buy one out of state, but then I wonder if they have to do an inspection to bring in the state. Thney might want to make sure it's still Diesel.

 

[Frankenchevy]

And don't forget this, That ALL DIESELS by VIN #, since the VIN designates to the state that you have a 6.2 truck, NO SMOG Required. So you find you an ORIGINAL 6.2 Squarebody, and you put the nastiest, dirtiest, biggest cam engine you can in that pig and drive the hell out of it with pride. BTW, I think this works up until 1996. So even if you had a 6.5 GMT400 truck, you are EXEMPT from Smog in Cali. This is exactly why I have NEVER sold and NEVER gave up on my K10 to K20 conversion build truck. I thought, if I ever move back to Cali, that truck is going with me and it'll be ugly ugly on the sniffer. But they'll never know it. Sadly, I hear that in itself, being a 6.2 truck, runs the price up in Cali cuz people will pay more for them just to get out of smog testing. Might have to buy one out of state, but then I wonder if they have to do an inspection to bring in the state. Thney might want to make sure it's still Diesel.

It’s up to 1997. Yes, out of state transfers require an inspection. Used to be any LEO could do it, so I had that covered. Now I think it’s only certain DMV employees and certain CHPs.

I wouldn’t mind keeping something 6.2. That’s what we were seeking out when looking for suburbans. However, the few K burbs I found were kind of clapped for the price. We got ours for $5k, which I think was a fair price considering the condition of the body, interior and chassis.

 

[Frankenchevy]

I decided I’m just going to fire the Parts Cannon at it. Not that there’s many parts left to replace at this point. I am ordering a set of balanced injectors from a guy in Michigan and I also ordered a magna flow catalytic converter and Summit Racing knock off 40 series.

My injector pattern looks okay, but maybe a bit heavy. Hard to capture on camera. I don’t see any obvious dribbles or drips and the stream looks cone shaped.

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[HotRodPC]

It’s up to 1997. Yes, out of state transfers require an inspection. Used to be any LEO could do it, so I had that covered. Now I think it’s only certain DMV employees and certain CHPs.

I wouldn’t mind keeping something 6.2. That’s what we were seeking out when looking for suburbans. However, the few K burbs I found were kind of clapped for the price. We got ours for $5k, which I think was a fair price considering the condition of the body, interior and chassis.

That sux, so to get my 85 registered in Cali, I'd first have to get it inspected to be sure it's still a diesel. But then once I did that, THEN I could put the nastiest smoggiest big block with a big azz cam in it and NO CATS and not have to worry about inspection ever again right?

 

[HotRodPC]

That sux, so to get my 85 registered in Cali, I'd first have to get it inspected to be sure it's still a diesel. But then once I did that, THEN I could put the nastiest smoggiest big block with a big azz cam in it and NO CATS and not have to worry about inspection ever again right?

Hell, it don't matter, I own land in OK and I won't sell it. I'll be able to keep my vehicles registered in OK unless they changed that law too. The liklihood of me moving to Cali, is slim to none anyway. And if I did go to Cali, it would probably be in my Bus, but I might tow one of my trucks there. No telling. doubtful but maybe a miracle will happen.

 

[Olegmbuilder]

Hello, vehicle is a 1988 Suburban V20. Failed smog today due to high CO% (1.6 %). Looking for suggestions on the most likely culprit.

I have a new AC Delco o2 sensor that I’ll be installing. Also have a set of AC Delco plugs and CTS that I’ll install.

What I’ve recently installed:
AC Delco MAP sensor
AC Delco TPS
Standard Motor IAC
GM Genuine ignition coil
AC Delco cap and rotor

Manifold vacuum looks low. Maybe suspect new ACD MAP sensor?

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Don’t suspect vacuum leak because HC value was not high on smog test according to tech. Also, when setting base idle with IAC fully closed and disconnected, I can get the engine to idle below 400rpm.

Any help appreciated

Hello, vehicle is a 1988 Suburban V20. Failed smog today due to high CO% (1.6 %). Looking for suggestions on the most likely culprit.

I have a new AC Delco o2 sensor that I’ll be installing. Also have a set of AC Delco plugs and CTS that I’ll install.

What I’ve recently installed:
AC Delco MAP sensor
AC Delco TPS
Standard Motor IAC
GM Genuine ignition coil
AC Delco cap and rotor

Manifold vacuum looks low. Maybe suspect new ACD MAP sensor?

You must be registered for see images attach

You must be registered for see images attach

Don’t suspect vacuum leak because HC value was not high on smog test according to tech. Also, when setting base idle with IAC fully closed and disconnected, I can get the engine to idle below 400rpm.

Any help app

Hello, vehicle is a 1988 Suburban V20. Failed smog today due to high CO% (1.6 %). Looking for suggestions on the most likely culprit.

I have a new AC Delco o2 sensor that I’ll be installing. Also have a set of AC Delco plugs and CTS that I’ll install.

What I’ve recently installed:
AC Delco MAP sensor
AC Delco TPS
Standard Motor IAC
GM Genuine ignition coil
AC Delco cap and rotor

Manifold vacuum looks low. Maybe suspect new ACD MAP sensor?

You must be registered for see images attach

You must be registered for see images attach

Don’t suspect vacuum leak because HC value was not high on smog test according to tech. Also, when setting base idle with IAC fully closed and disconnected, I can get the engine to idle below 400rpm.

Any help appreciated.

Hello did you trying to put on a new gas cap with a rubber seal not the cheap ones either a quality one.

 

[Olegmbuilder]

Hello did you trying to put on a new gas cap with a rubber seal not the cheap ones either a quality one.

 

[Frankenchevy]

That sux, so to get my 85 registered in Cali, I'd first have to get it inspected to be sure it's still a diesel. But then once I did that, THEN I could put the nastiest smoggiest big block with a big azz cam in it and NO CATS and not have to worry about inspection ever again right?

Well…the fuel type is on the reg, so if you get pulled over and someone wants to press the issue it could be a problem. Honestly, the best bet it to stick to 1975 and older to be totally safe.

Hot rod culture was arguably born here. Now they are doing everything they can to kill it.

Hell, it don't matter, I own land in OK and I won't sell it. I'll be able to keep my vehicles registered in OK unless they changed that law too. The liklihood of me moving to Cali, is slim to none anyway. And if I did go to Cali, it would probably be in my Bus, but I might tow one of my trucks there. No telling. doubtful but maybe a miracle will happen.

I think they want you to get a license and reg after a certain period of time in the state, but you’d have a strong argument with the bus/rv towing a dingy. You’d just be traveling and not a resident of CA.

 

[Frankenchevy]

Hello did you trying to put on a new gas cap with a rubber seal not the cheap ones either a quality one.

I don’t think that affects the evap system to the extent that it will change the fueling parameters or otherwise disrupt the computer like it does on newer vehicles. I could be wrong though…

 

[HotRodPC]

I don’t think that affects the evap system to the extent that it will change the fueling parameters or otherwise disrupt the computer like it does on newer vehicles. I could be wrong though…

Nope, won't affect the sniffer test at all. That's pretty much just a visual test for your year model truck. It's there, and hoses are connected to it, so PASS. It may be empty, but it's there. Just like hollowed out AIR Pumps. It's there and all the hoses and hardware are hooked up so PASS. Some say the EGR test is the same way, NOT !!! Sure it's visual. It's there and has a vac line connected to it so PASS on the visual. BUT, they hook a vac pump to the EGR to make sure it's functioniong. With the engine idling, they hit the EGR with a vacuum pump and the engine better stumble badly and almost shut off or the EGR is not functioning, then FAIL EGR Function Test. All that could have changed by now too. When I was do Cali smogs, I got in early, like the fist year they started doing emissions testing. I took the state class, then took the state exam and BOOM, I was a state licensed test and repair tech.