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10-26-2011, 03:00 AM
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#1 |
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Registered User
Join Date: Mar 2009
Location: denver,co
Posts: 3
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How do i make my 1985 C10 pass emissions?
ok so i just finally rebuilt the transmission in my 1985 c10. it has a 305 and its a auto. im getting ready to run it threw emissions. but so far i noticed it has no cats and no smog pump. i have a lack of know how on this subject. so please can some one give me some steps to start takeing???
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10-28-2011, 10:44 PM
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#2 |
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Registered User
Join Date: Jun 2011
Location: Atlanta ga
Posts: 150
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Re: How do i make my 1985 C10 pass emissions?
The hard way...
Find a donor truck that has all of the emission devices still on the motor. You will need a service manual for the specific year to figure out all of the missing pieces; along with manifold air tubes, air pump, cat, etc..... The easier way... Find a back allay shop, leave $20 on the dash, and tell'em to hook you up. Seriously, I struggled for 4 years trying to get a 1985 Jeep wagoneer to pass emissions (those things probably failed emissions from the factory in new condition). This was the only way that I could get it past emissions. The shady way... Find a vin # off of a C20HD or C30 truck (the models over Gvw9600# are exempt in most states) in the junkyard (one that is heading for the crusher), use that vin #.
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1984 C20, 454, 4 speed named "Gold Member" Last edited by cjlinkster; 10-28-2011 at 10:55 PM. |
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10-28-2011, 10:52 PM
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#3 |
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Registered User
Join Date: Jun 2011
Location: Atlanta ga
Posts: 150
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Re: How do i make my 1985 C10 pass emissions?
Also, I don't know if your state has the visual inspections or not. Our state doesn't visually inspect. If they don't visually inspect, then you may get by without the air pump, air tubes, etc. I would plan on a pair of high performance cats, and then lean out the mixture. That may get you past the test for this year. After passing the test, I would remove the cats until the following year.
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1984 C20, 454, 4 speed named "Gold Member" |
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10-29-2011, 07:13 AM
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#4 |
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Registered User
Join Date: Jul 2007
Location: Ontario Canada
Posts: 1,006
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Re: How do i make my 1985 C10 pass emissions?
Mine would never pass on it's own so i would get a block away and then pull over and lean out the mixture and retard the timing and it always passed but thankfully I don't have to worry about that anymore as it is old enough now to not need a etest
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10-29-2011, 07:32 AM
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#5 |
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Registered User
Join Date: May 2010
Location: laurel hill Fl
Posts: 645
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Re: How do i make my 1985 C10 pass emissions?
temporary lp conversion?
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1985 C10 Custom Deluxe LWB 305/700r4 [ Goldfinger ]  1999 k3500 crew cab dually 6.5tdi/4l80e |
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10-29-2011, 08:32 PM
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#6 |
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Registered User
Join Date: Dec 2006
Location: SLC, UT
Posts: 706
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Re: How do i make my 1985 C10 pass emissions?
If your state does not have visual inspection, if the motor is properly tuned, it may pass the "sniffer" test.
If you do have visual inspection, it won't matter how clean it runs, it will fail because the emissions equipment is gone. Unfortunately, putting that stuff back on can get expensive. |
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04-13-2012, 02:32 PM
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#7 |
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Registered User
Join Date: Apr 2012
Location: sandy utah
Posts: 15
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Re: How do i make my 1985 C10 pass emissions?
i have an 85 c20 its got these chrome tubes connected by bungs straight into my exhaust manifolds, is that california emisions crap
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04-13-2012, 03:25 PM
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#8 |
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Registered User
 
Join Date: Jul 2010
Location: memphis
Posts: 2,537
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Re: How do i make my 1985 C10 pass emissions?
take it thru & see where she stands & start from there..
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1981 C-10 (Pop's) 1978 Camaro 2006 Lacrosse |
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