Two or three times I've replaced the fiberglass looking seal for the exhaust manifold heat shield tin. Its mostly gone again and making noise ratteling. Is there something better to use that will take the heat. I've been thinking to just leave it out and put short springs or something where the bolts are. Its a nuisance, but then wonder if a goody two shoes smog guy might nail me on that missing....

 

you can try remflex...

 

Mine was gone when I bought the truck. What does it have to do with emissions control? I do like not having inspections where I live.

 

Rimflex is interesting but for a very small sheet its $35, seems like it might work well for warped intake manifold also? They have gaskets for 22R's but not the tin heat shield.

Sealing the tin shield keeps the heat in and manifold temp up to be more efficient in the catalitic converter. Same idea as water thermostat having higher temps now than on earlier motors. I hear ya on the inspections plus its about $50 every two years if theres nothing to repair. Prior to inspection I place a piece of cardboard in front of radiator to get it even hotter might or might not help?

 

Are you talking about the heat shield or the donut gaskets between the manifold and the downpipe?

 

My question is about 2 piece Heat shield, think theres about 6-8 small bolts holding its cover on. It surrounds the largest mass of exhaust manifold. Maybe it wasn't on all models, I don't know?

Pic shows inner shield with about 3/4" wide flat gasket, cover is removed.

 

Is my truck supposed to have a catalytic converter? Oops.

 

actually , its operation is that of a "stove pipe" . Toyota use to use these on the older corollas and corona models . it is for the colder climates and conditions and effectively draws warm air from the air pocket surrounding the exhaust manifold into the carburetor in cold weather on initial start and warm up .

unless your keeping your truck in "factory" condition , then I would just remove it . even if you are keeping it in factory condition , I would just remove it , but keep it , so if you ever sell it you have it .


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Thats true, but I think maybe its dual purpose maybe not by design but chance? Not Cold in So. Cailf. I know the manifold is just a big open chamber on mine where I've seen the toyota cars of that era with seperate cast tubes more like a header, more efficent i'm sure. on mine the common cavity like in the pic, all 4 cylinders feed into becomes a heater, hotter gases into cat, less emissions, unless i'm missing something. I know they wont pass smog if the short hose from the tin to air cleaner snout is missing, at least the smog station required me to replace mine when it was screwed up?

 

IIRC you can pass CA emissions without the heat shield, but you cannot pass without the EGR hooked up.

 

Might depend on who you go to. I started going to the same test only, now its been 10 years so the guy knows me and I get a pass on small things sometimes like fuel seal or check engine light on another car. I'd ask him before removing the tin but its easier just keeping things right after finding the big problem that failed me and buying a cat two times in a row. Holes in the distributor vacuum advance diaphrams. I thought those lasted pretty much forever,

 

I've run remflex with header, has been best seal yet since '10 but truck sat in storage for 3 yrs.

As for manifold??? IDK. I'd would only be concerned about heat shield if emission inspectable.

 

this is correct , as far as I know ...
I have done doug thourly headers on some cali trucks .. no heat shield on the headers only EGR . and YES , the trucks DID have cats




anyway ... I don't mean to get off topic , just providing another option for you


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I'll have to ask the Test Only guy again and see what he says? Also I've heard Smog regulations are different by countys within the state. A friend in northern Cal didnt have to smog test but if were in so cal would???