351M failed emmissions
Senior User
Joined: Jun 2001
Posts: 200
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From: Davis, CA
351M failed emmissions
Yeah, the ref passed mine. Here's a list of all the things I changed.
-Completely replaced and wired correctly all of the vacuum lines, with all the right peices in all the right places.
-Rebuilt the carb, cleaned the egr spacer
-Replaced EGR valve
-plugs, wires, cap, rotor, distributor replaced
-tuned to perfection
--carb tuning, and alot of it.
--timing at 7, a little under
--replaced the vacuum advance unit on the dist
--replaced plug wires again.
Mainly a lot of fine tuning. Check the timing on the high side to. Too much vacuum advance will kill the high side. A good guide to idle carb screws is screwing in raises HC's and lowers CO, while screwing out lowers HC's and raises CO's. I can give you a vacuum diagram if you tell me the specifics on the truck. Thats all I can think of right now.
-Completely replaced and wired correctly all of the vacuum lines, with all the right peices in all the right places.
-Rebuilt the carb, cleaned the egr spacer
-Replaced EGR valve
-plugs, wires, cap, rotor, distributor replaced
-tuned to perfection
--carb tuning, and alot of it.
--timing at 7, a little under
--replaced the vacuum advance unit on the dist
--replaced plug wires again.
Mainly a lot of fine tuning. Check the timing on the high side to. Too much vacuum advance will kill the high side. A good guide to idle carb screws is screwing in raises HC's and lowers CO, while screwing out lowers HC's and raises CO's. I can give you a vacuum diagram if you tell me the specifics on the truck. Thats all I can think of right now.
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Elder User
Joined: Sep 2000
Posts: 936
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From: Bay area
351M failed emmissions
1978 bronco, 351M 2 barrel carb. only smog equiptment is a EGR valve and PCV valve.
I really have to find all the vacume routing on this thing.
Thanks for all the input. and you can email me at any time as well i fyou have vacume line routing pictures.
Don@overclockers-network.com
thanks again
I really have to find all the vacume routing on this thing.
Thanks for all the input. and you can email me at any time as well i fyou have vacume line routing pictures.
Don@overclockers-network.com
thanks again
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Elder User
Joined: Sep 2000
Posts: 936
Likes: 0
From: Bay area
351M failed emmissions
Well I replaced the thermastat with the recommened 195F and now it sounds like it is knockin over 2500 rpm's.
I am going to have to see if it is too lean, and possibly move the timing back to 10 degrees.
Gonna have to have her tested agian. Maybe I can find some place tommarrow.
I am going to have to see if it is too lean, and possibly move the timing back to 10 degrees.
Gonna have to have her tested agian. Maybe I can find some place tommarrow.
Senior User
Joined: Jun 2001
Posts: 200
Likes: 0
From: Davis, CA
351M failed emmissions
There are about 7 different diagrams for that combo, depending on a few different things. I would highly recommend going to a smog ref. The ones I talked to are always pretty cool about everything. They will however, make sure that EVERYTHING is right, which might mean spending a little more money. But otherwise, see if you can find a Mitchells Emissions manual for that year. It will tell you absolutely everything you want to know. I got mine from a friend that worked at a smog/gas station, but I got the same thing from the smog ref. If you plan on just getting it tested at a smog shop, I would definitely recommend going to a nontestonly shop, so they can fiddle around with it.
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Elder User
Joined: Sep 2000
Posts: 936
Likes: 0
From: Bay area
351M failed emmissions
I hear ya there dude.
I think I will give it one last shot. I will take it to a pretest station and see what they say. From there I will call a ref.
Thanks for all of your help dude!
I think I will give it one last shot. I will take it to a pretest station and see what they say. From there I will call a ref.
Thanks for all of your help dude!
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