1978 Wagoneer California emissions vacuum diagram

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Roz
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Joined: Thu May 13, 2021 5:47 am

1978 Wagoneer California emissions vacuum diagram

Post by Roz » Fri Jun 11, 2021 12:02 pm

Good afternoon. I am new here and just bought a 78 Waggy. However, I cannot find (because it is no longer on the air filter) the proper emissions vacuum diagram. I have seen the one on olijeep, but it is not from a 78. Would you be able to possibly give assistance?
Roz
1978 Wagoneer

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tgreese
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Joined: Fri Jun 08, 2012 6:31 am
Location: Medford MA USA

Re: 1978 Wagoneer California emissions vacuum diagram

Post by tgreese » Fri Jun 11, 2021 2:26 pm

The complete '78 TSM is on that site. Look at section 1A for the applicable systems. Then go to each section in the manual for vacuum plumbing. It's not complicated enough to have an overall diagram, like later years.

Looks like there's no California-only spec for the Wagoneer in '78. Vehicles above 6000 lb GVWR have different rules, and likely escaped special treatment in California for that year.

Note that requirements and equipment were changing rapidly in this era, and what was required in other years is not relevant. Use the '78 TSM.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 FCA Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.

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tgreese
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Location: Medford MA USA

Re: 1978 Wagoneer California emissions vacuum diagram

Post by tgreese » Sat Jun 12, 2021 7:51 am

I would also mention - the TSMs are printed in advance of the model-year release, and things might change by the time the Jeeps get to the dealerships. The TSMs also can be mistaken. They are the single most accurate and authoritative source for your year and model, but mistakes are not unknown. I would let the Jeep determine the required emissions systems, if it disagreed with the manual. If your Jeep has vapor recovery, for instance, I would keep it and expect the inspection station will look for it. Same with a cat. I would not remove any systems the TSM says should not be present - that's probably wrong.

First post - welcome from Boston!
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 FCA Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.


Triumph215
Posts: 133
Joined: Thu Jan 07, 2021 8:42 pm
Location: Monterey, Ca

Re: 1978 Wagoneer California emissions vacuum diagram

Post by Triumph215 » Sat Jun 12, 2021 7:58 am

Welcome !
I have a '77 with everything intact and am in Monterey. If you're close enough you are more than welcome to come have a look at how mine is plumbed. I can't yet figure out how to post pictures since I don't use the social media apps and Tapatalk insists that i do. I can email pics to you though if you want to PM me an email address.
1964 Triumph TR4 with 1964 Olds 215 heart transplant
1977 Wagoneer
2009 BMW GS1200


letank
Posts: 3406
Joined: Wed Oct 03, 2012 9:16 pm
Location: SF bay area

Re: 1978 Wagoneer California emissions vacuum diagram

Post by letank » Sat Jun 12, 2021 9:31 am

Welcome from the bay area, you should have a sticker on the valence, above the driver's side headlight, under the hood by the coolant expansion tank.

The schematics have quirks... the TSM is a bit lame as there is not a global layout for the whole vacuum system, each unit has a separate description.

Here is the valence sticker for the 85, with the V8

Image

pm if you are around SF, we can help you
Michel
74 wag (349 Kmiles... parked, next step is a rust free body)
85 Gwag (227 Kmiles... the running test lab)
See Engine bits , Fuel and brake lines, Body work, Trany and TC

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tgreese
Posts: 4732
Joined: Fri Jun 08, 2012 6:31 am
Location: Medford MA USA

Re: 1978 Wagoneer California emissions vacuum diagram

Post by tgreese » Sat Jun 12, 2021 10:12 am

Skeptical that a '78 will have a valence sticker with a diagram. It should have a valence sticker with the tune-up information and emissions-related specs, like model, displacement and equipment. Any sticker on the air cleaner would have been only about air cleaner servicing, I believe.

Typical valence sticker from my '82:

Image

Air cleaner sticker:

Image

If you really need a diagram, look at this diagram posted for a 1979 on the Tom Collins site: https://oljeep.com/gw/vac/79/79-FSJ-360_Vacuum.jpg

It will have the same layout for the devices and plumbing, except (according to the '78 TSM) there will be no vapor recovery ("purged vapors") connection.
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Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 FCA Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.


Topic author
Roz
Posts: 2
Joined: Thu May 13, 2021 5:47 am

Re: 1978 Wagoneer California emissions vacuum diagram

Post by Roz » Wed Jun 16, 2021 5:46 am

Thank you everyone for the welcome and assistance! I really appreciate the info!!
Roz
1978 Wagoneer

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