64 c10 need to pass emission

[jolobo64]

I have 64 c10 with four barrel carb on a 350. My truck is overseas and even our classics have to pass emissions. The problem HC limit is 1200 ppm but mines read 5700ppm. Now there are no obvious problems, engine runs good. When I bought the truck I always noticed strong fumes coming from exhaust but you know older babies do that sometimes. The carb, intake manifold, and related gaskets are new. Any ideas where I can start to check?

Also another issue the truck has the halogen light for the headlight and no high beams. The blinkers work fine but the left blinker it is much dimmer than the right blinker and when I turn on parking lights they do not come on, any ideas how to get brighter blinker( I changed the bulb already) and get the parking lights to come on?

[jtrichard]

light problem is lack of GROUND

[jolobo64]

Originally Posted by jtrichard

light problem is lack of GROUND

thanks
blinker only or parking lights also? I'm not a expert with electrical stuff how can I extend the ground?

[Chevy Fleetside]

Parking lights are not designed to come on with the headlights. To do so you have to connect the purple wire and I can't remember the other color at the switch. Check a wiring diagram, or someone here can remember which one. To get the emissions down would probably require a smog pump. Could just need the carb adjusted. There are so many smog devices missing from that truck that are on newer cars and trucks. Smog pumps didn't appear on trucks untill 1966. Engine timing can do it also. I could probably keep going but I will stop now. Maybe if you find a shop that will dial it in for you or if they even can. Good Luck.

[joedoh]

edit: I see Chevy Fleetside has given this idea first.

obtain and install a "smog pump", they are common on 70's and early 80's vehicles. They pump air into the exhaust manifold and, while there is a tiny little extra burning of hydrocarbons with the extra air, the main benefit is that it changes the ratio of HC to O2 by increasing the O2, usually to an allowable limit.

alternatively, you could install a catalytic converter in the exhaust and actually burn up the hydrocarbons.

[Captainfab]

There is a bit of important information missing to give more than just general ideas. What carb is on your engine? What ignition? Where is the timing set at? When was a tune up last done? Is the engine stock? Are you certain it is a 350?

[Chevy Fleetside]

See how they chime in... You could probably write a 2 page post on this stuff. I had a smog license back in the mid 80's. I really don't remember much of the 80's though.

[aerotruk63]

1966 GMC slideshow on smog pump.

https://www.youtube.com/watch?v=0VuP6AIlOdI

[awbrown]

You said you smell fumes , what carb do you have ? have you adjusted the idle mixture screws?? have you checked the timing ??

[jolobo64]

Originally Posted by awbrown

You said you smell fumes , what carb do you have ? have you adjusted the idle mixture screws?? have you checked the timing ??

I have a demon carb, timing is good but I have not adjusted the idle mixture screws, I was thinking to do that to see if it will reduce the fumes and then go take it back for another test. Also it takes a good wild to warm up don't know if thats related or not.

[Chevy Fleetside]

I believe a Demon Carb is a performance carb. Not really an emission carb.

[jolobo64]

Originally Posted by Chevy Fleetside

I believe a Demon Carb is a performance carb. Not really an emission carb.

yes thats true its built for performance but if the idle mixture screws are off or adjusted for other than cruising for example couldn't that affect the H2 also?

[Chevy Fleetside]

It probably has a performance cam shaft in it also. But I wouldn't know since I didn't build it.

[NEWFISHER]

Install a smaller carb designed for better economy. Cut the last 3 feet of exhaust off and weld up a cat converter and a cherry bomb with a bolt on turn down. Drill a hole vertically through the pipe just behind the glass pack. Test fit a body washer and drop a nail through the hole to hold the washer. Stuff the glass pack with 2 bags of steel wool and install the washer, nail and the turn down a block away from the inspection station. Idle in and pass inspection. Remove the temporary exhaust and bolt the demon back on.
Dont ask how I know this works.

[61_FL_Apache]

I would think some cats would help burn off the bad stuff.

[jolobo64]

Thanks for all the advice, got the lights working, found wiring schematics , purple wire was cut, wires criss crossed and ground problem. that socket holder didn't want to ground when popped in. Now I'm about to play with the carb.

[Monte's62]

Originally Posted by jolobo64

I have 64 c10 with four barrel carb on a 350. My truck is overseas and even our classics have to pass emissions. The problem HC limit is 1200 ppm but mines read 5700ppm. Now there are no obvious problems, engine runs good. When I bought the truck I always noticed strong fumes coming from exhaust but you know older babies do that sometimes. The carb, intake manifold, and related gaskets are new. Any ideas where I can start to check?

Also another issue the truck has the halogen light for the headlight and no high beams. The blinkers work fine but the left blinker it is much dimmer than the right blinker and when I turn on parking lights they do not come on, any ideas how to get brighter blinker( I changed the bulb already) and get the parking lights to come on?

Jlobo, is this just a Fulton county law. I thought that all vehicles a certain age do not have to pass emissions in Georgia. I'm not saying your wrong, I just had no idea. I haven't had to get emissions for my 88 truck for the last 2 years.

[blown240]

There is always the rubbing alcohol in the gas tank trick. A buddy used to get a mid 80s firebird to pass with no cats in CA...

[Monte's62]

jolobo, google Georgia's Clean Air Force for all the info on what needs and what doesn't need emissions. I think your in the clear unless you just want a cleaner running truck.

[Monte's62]

Sorry jolobo, I read your post wrong thinking your truck was going to be shipped here from overseas.

[jolobo64]

Originally Posted by Monte's62

Sorry jolobo, I read your post wrong thinking your truck was going to be shipped here from overseas.

No problem yea when I went overseas I took the truck with me. You are right GA we don't need any emissions for the older ones

[jolobo64]

I have an oil leak from the front, see pics. I notice there is a hole (q-tip) opposite the water hose. The oil seems to be coming out of that threaded hole and hitting the water hose and running down. What is that hole for and should there be a screw with some type of o ring or washer to close it up?

[PGSigns]

A short bolt is all you need with a washer on it. The hole is to put a longer bolt in to hold the fuel pump shaft when changing the pump. Don't use a bolt longer than about 1/2" long. It's 3/8 16.
Jimmy

[19515windowsolow]

Originally Posted by jolobo64

I have 64 c10 with four barrel carb on a 350. My truck is overseas and even our classics have to pass emissions. The problem HC limit is 1200 ppm but mines read 5700ppm. Now there are no obvious problems, engine runs good. When I bought the truck I always noticed strong fumes coming from exhaust but you know older babies do that sometimes. The carb, intake manifold, and related gaskets are new. Any ideas where I can start to check?

Also another issue the truck has the halogen light for the headlight and no high beams. The blinkers work fine but the left blinker it is much dimmer than the right blinker and when I turn on parking lights they do not come on, any ideas how to get brighter blinker( I changed the bulb already) and get the parking lights to come on?

I got mine to pass, I turned down the fuel mixture to the point where it just choked out if I stepped on it hard, I ran premium fuel and the key is to let it warm up for a long time before taking it in. I also retarded the timing 10 degrees and it passed first time. the only thing that sucks is that you have to re-tune everything :/