Manifold/exhaust hole sealant - Alfa Romeo Forum
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Had a 33 1.7 QV

Manifold/exhaust hole sealant

Can anyone recommend a good sealant to fill small holes in my manifold and seal the part where it joins the mid section?

I have a wideband lambda and cannot get it to read properly.
Keeps reading 20 and going off the scale, occasionally drops back down to around 13-14 then back to very lean. I know my mixture is not this lean.

I know the data-logging module is fine, also the relatively new Bosch 4.9 sensor is new (and will show and error code on the gauge is it fails).

I'm now thinking it's the few small pinholes around the primary/secondary weld and maybe also the joint at the mid section.

Want to try some sealant to see if it starts reading correctly again.

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Hi Brit
You might try some Exhaust joint sealant but it may well fall off. Welding or brazing the holes would be better. Years ago in desperation I took my Sprite to a main dealer garage to set the Twin SU carbs up. They did it on their gas analyser and I drove the car away - It was TERRIBLE so I took it back. They said it had been difficult to set up as there was a crack all round an exhaust flange which was letting in air so they kept richening the mixture........DOH!
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hole , manifold or exhaust , sealant

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