Gotta smog soon... any suggestions? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sixshooter798 · 10-12-2010, 01:29 AM

The time has come again for me to smog my 77 C10. She has a stock 350/350 with all of the smog junk still attached. I recently installed an Edelbrock 1400 carb because the Quadrajet kept causing it to fail. Does anyone have any advice on how to help the old girl pass smog a little easier?

Number21 · 10-12-2010, 02:18 AM

Pour some 99% rubbing alcohol or "Heet" gas dryer (same thing) into your tank with as little gas as you can get away with. It may run like crap but it will burn cleaner. Otherwise make sure it's good and hot before testing.

Michael Hill · 10-12-2010, 03:13 AM

Or you can put some denautered alcohol in your tank with a little gas and it will pass with flying colors. Just make sure that after you pass the smog you go and fill up the tank to dillute the alcohol that is left in your tank.

GMC Guy · 10-12-2010, 06:48 AM

Seafoam the **** out of it

xrcr · 10-12-2010, 07:08 AM

I used to put in some methanol,lean it out and run the crap out of it right before it was sniffed in my 76. Then I said screw it and got historic tags

68 TT · 10-12-2010, 08:13 AM

Set the idle mixture screws for maximum vacuum.

Set the base idle to as high as they will allow in the test. Here it is 1100 rpm. Check with your testing station to see what they will allow.

As stated earlier, make sure it is good and warmed up.

Make sure you do not have any exhaust leaks. They really throw off the test.

People have told me in the past to run it a quart low on oil when you take it in for testing but I have never done it. Supposedly it creates less windage tossing oil onto the cylinder wall so less oil burning.

83burban · 10-12-2010, 05:46 PM

Change the oil, run seafoam through it, and pour alcohol into the gas tank. I always run this crap out of it right before I take it in, so that the cat is good and hot if equipped.

Oilbrnr · 10-12-2010, 08:13 PM

Go to church the Sunday prior to the test.

sixshooter798 · 10-12-2010, 08:57 PM

Quote:

Originally Posted by Oilbrnr

Go to church the Sunday prior to the test.

lol

sixshooter798 · 10-12-2010, 08:59 PM

Quote:

Originally Posted by Michael Hill

Or you can put some denautered alcohol in your tank with a little gas and it will pass with flying colors. Just make sure that after you pass the smog you go and fill up the tank to dillute the alcohol that is left in your tank.

how much of this stuff should I buy?

sixshooter798 · 10-12-2010, 09:07 PM

Quote:

Originally Posted by 68 TT

Set the idle mixture screws for maximum vacuum.

.

So.... is that as far clockwise as possible or vice-versa?

Malo83 · 10-13-2010, 02:38 PM

My routine for my 83 is a good tune up, plugs,cap and rotor new air filter and spray out PCV valve with carb cleaner and spray down carb and down the throats while in a high RPM. fresh oil and filter, add a bottle of Guaranteed to Pass additive to the tank and run the sheeet out of her down the highway to get her nice and hot and straight to the smog station

she hasn't failed yet

* make sure your timing is right on.

GmtGmt · 10-13-2010, 02:48 PM

Sorry little oftopic

what happens if you truck/car dosent pass smog? do you get a second change?
when the trucks that user krazyray parts out with the CA DMV fees? why dose these fees come?

MTCK · 10-13-2010, 02:49 PM

Max vacuum is the highest vacuum you see on a vacuum gauge while adjusting the idle mixture screws. 15 bucks at your parts warehouse for a vacuum gauge. Also do the timing, as mentioned.

sandnuriz · 10-13-2010, 04:21 PM

Quote:

Originally Posted by sixshooter798

The time has come again for me to smog my 77 C10. She has a stock 350/350 with all of the smog junk still attached. I recently installed an Edelbrock 1400 carb because the Quadrajet kept causing it to fail. Does anyone have any advice on how to help the old girl pass smog a little easier?

1. You have a your smog crap on it?
2. Your new Edelbrock carb have smog tag on it and paper work?
3. Have you failed the test already?
4. Find a good smog shop and bs with them it helps!

Smog is a joke here in Cali. trust me

10-12-2010, 01:29 AM	#1
sixshooter798 Desert Rat Join Date: Jul 2010 Location: Mojave Desert Posts: 169	Gotta smog soon... any suggestions? The time has come again for me to smog my 77 C10. She has a stock 350/350 with all of the smog junk still attached. I recently installed an Edelbrock 1400 carb because the Quadrajet kept causing it to fail. Does anyone have any advice on how to help the old girl pass smog a little easier?

10-12-2010, 02:18 AM	#2
Number21 Registered User Join Date: Aug 2009 Location: Oregon Posts: 611	Re: Gotta smog soon... any suggestions? Pour some 99% rubbing alcohol or "Heet" gas dryer (same thing) into your tank with as little gas as you can get away with. It may run like crap but it will burn cleaner. Otherwise make sure it's good and hot before testing. Last edited by Number21; 10-12-2010 at 02:19 AM.

10-12-2010, 03:13 AM	#3
Michael Hill Registered User Join Date: Feb 2008 Location: Avondale, Arizona Posts: 54	Re: Gotta smog soon... any suggestions? Or you can put some denautered alcohol in your tank with a little gas and it will pass with flying colors. Just make sure that after you pass the smog you go and fill up the tank to dillute the alcohol that is left in your tank.

10-12-2010, 06:48 AM	#4
GMC Guy Registered User Join Date: May 2009 Location: Sparks, NV Posts: 913	Re: Gotta smog soon... any suggestions? Seafoam the **** out of it __________________ Greg 1974 GMC 1/2 Ton SWB Fleetside L33 5.3/4l65e .................__ ............._____l __\__ ..............l_(O)_ l___(O)]

10-12-2010, 07:08 AM	#5
xrcr Registered User Join Date: Dec 2008 Location: Foristell, MO Posts: 418	Re: Gotta smog soon... any suggestions? I used to put in some methanol,lean it out and run the crap out of it right before it was sniffed in my 76. Then I said screw it and got historic tags

10-12-2010, 08:13 AM	#6
68 TT Still plays with trucks Join Date: Jul 2009 Location: Spokane, WA Posts: 3,556	Re: Gotta smog soon... any suggestions? Set the idle mixture screws for maximum vacuum. Set the base idle to as high as they will allow in the test. Here it is 1100 rpm. Check with your testing station to see what they will allow. As stated earlier, make sure it is good and warmed up. Make sure you do not have any exhaust leaks. They really throw off the test. People have told me in the past to run it a quart low on oil when you take it in for testing but I have never done it. Supposedly it creates less windage tossing oil onto the cylinder wall so less oil burning. __________________ miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars

10-12-2010, 05:46 PM	#7
83burban Registered User Join Date: Feb 2008 Location: la Posts: 345	Re: Gotta smog soon... any suggestions? Change the oil, run seafoam through it, and pour alcohol into the gas tank. I always run this crap out of it right before I take it in, so that the cat is good and hot if equipped.

10-12-2010, 08:13 PM	#8
Oilbrnr Registered User Join Date: Feb 2009 Location: Scottsdale, AZ Posts: 390	Re: Gotta smog soon... any suggestions? Go to church the Sunday prior to the test. __________________ -Don- '66 C10 w/factory A/C '77 Cheyenne K5 350/465/205 '80 Custom Deluxe K20 350/465/205 '04 Denali XL '05 DMax CCLB 4x Have a Hickey Sidewinder Winch and need the owners/install manual? Send me a PM with your email address and I'll forward you a .pdf

10-13-2010, 02:38 PM	#12
Malo83 Cruzzzn' Vet Join Date: Jan 2005 Location: Porterville,Ca. Posts: 1,918	Re: Gotta smog soon... any suggestions? My routine for my 83 is a good tune up, plugs,cap and rotor new air filter and spray out PCV valve with carb cleaner and spray down carb and down the throats while in a high RPM. fresh oil and filter, add a bottle of Guaranteed to Pass additive to the tank and run the sheeet out of her down the highway to get her nice and hot and straight to the smog station she hasn't failed yet * make sure your timing is right on.

10-13-2010, 02:49 PM	#14
MTCK Registered User Join Date: Dec 2009 Location: Fairbanks, AK Posts: 1,830	Re: Gotta smog soon... any suggestions? Max vacuum is the highest vacuum you see on a vacuum gauge while adjusting the idle mixture screws. 15 bucks at your parts warehouse for a vacuum gauge. Also do the timing, as mentioned. __________________ -Marcus 1991 V3500 L29 454 4L80E NP205 D60/14 Bolt 4.56's 1984 K30 292 TH400 NP205 D60/14 Bolt 4.56's flat bed 7'6" Meyer Plow 2022 Silverado 3500 L8T Project Daily Driver Project Heavy Hauler Project Plow Truck

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