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How can I find out if my 78 is a cal. truck or not.
I have a Haynes book but can not figure this thing out. I don't have a BP transducer, but I do have a cat.
I have the vaccuum switch on the left near the fuse block and the mixture control valve up the front on the right . Of course the air pump (although I tink it might be weak) and the air control valve are there the egr works but when its hooked up the eng. will sputter and caugh like crazy.
Any ideas or help would be very muck appreciated.

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OK, I'm over it. Where's the beer?

Duhhh I put this one in the wrong section. Oh well I'll just wait and see what happens.
This is my brain, fade in fade out.:fadein:

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OK, I'm over it. Where's the beer?

Repost in stock trucks would get you more answers. From what I recall, if you have a cat, you have a cali emissions truck. They might have added cats to federal trucks in 81 or 82, but I don't think so. I'd assume you have california emissions gear and see if that helps things make more sense.

Moved it for ya!!!!
Not sure the answer to your question but I think that the only 78's that had cats were the Cali models. I dont remember how many times getting an emissions here in Colorado I had to point that out to them in thier books. They would always try to fail me right away for no convertor and then I would have to have them look at the footnotes for the 78!!! , then ask them if I was in California or Colorado. I worked at a gas station in 85 and we had an emmision tester so I was always thumbing through the standards books!!

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Click on C.M. logo to go to my webpage


RIP R.J.B.

Thanks for the move!!
Ok. So I have a cali truck like I thought. But the vaccuum diagrams in my book and the ones another guy on this site sent me, show a BP transducer. I can't find one on my truck, not even an empty hole where one should be. Someone told me it was at the front on a bracket off the intake manifold but I have nothingI even checked at the local Pep Boys and the computer showed no such thing???
Can any one tell me what a BP transducer does ? Ron

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OK, I'm over it. Where's the beer?

No idea. Is that like the Flux capacitor?

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Click on C.M. logo to go to my webpage


RIP R.J.B.

Are you referring to a Back Pressure transducer?

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.

Yea. I'm starting to wonder.

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OK, I'm over it. Where's the beer?

Back pressure. ok thanks. I'll look for that . Everywhere I looked I only got BP and had no idea.

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OK, I'm over it. Where's the beer?

Oh yea. I also don't have a dashpot. Thats the little guy on the carb that won't let the throttle slam shut and cause the eng to back fire. The book says I should have one on a cali truck so I guess I've got my hands full.

I just luv a mystery

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OK, I'm over it. Where's the beer?

thats its
rondog i have 2 diffrent diagrams. the only thing thats different is one doesn't have a vacuum control valve. the other does. both of them do have a bp transducer
only cali 's had a cat converter.

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1980 luv sport 4x4 Just a memory now
Frame rusted from the inside. Truck stripped and now looking for a new donor in southern ohio

here's the one with no vaccum control valve.



here's with not one. it didn't say nothing about the extra diagram in the book. the exact same thing so i didn't send it to know one
hope you find the problem

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1980 luv sport 4x4 Just a memory now
Frame rusted from the inside. Truck stripped and now looking for a new donor in southern ohio