924Board.org

[Chumlie79]

problem my porsche 924 was smoking today so I looked uder my hood and there was fire coming out of the exhaust manifold area the connection between the manifold and the down pipe was red hot.

help jeramy
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1978 Porsche 924

[968rz]

Pluged cat converter or running VERY lean. Just a quick guess, what does the exhaust sound like at the outlet (if it sounds like whooshing air the converter is pluged)
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Rick
79 924 coupe Petrol Blue 3spd auto (wife's DD)
93 968 coupe Amazon Green 4spd Tip (my DD)

[Chumlie79]

the converter is new how do you fix it if it is running lean
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1978 Porsche 924

[968rz]

Thats the rub, you will need to figure out why its lean (if that is the problem) Vacume leaks and low fuel pressure can cause lean running, there is an adjuster between rubber intake boot and the fuel dist (small hole, should have a plug in it), you will need a small (but long) allen wrench (cant remember the size) to adjust this and make sure to remember where it was to start with so you can put it back if this is not helping (also; adjusting this WILL affect your emissions).
I'm sure someone else will have other ideas so wait until they speak up before adjusting the fuel mix, but start by looking for vac leaks.
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Rick
79 924 coupe Petrol Blue 3spd auto (wife's DD)
93 968 coupe Amazon Green 4spd Tip (my DD)

[jazz guy]

Check your timing. Retarded spark timing can cause the manifold to glow. Good luck!

Cheers, Brian

[Stampedetrail]

It's a 3 millimeter allen wrench, that's the trade secret. Clockwise = rich, counterclockwise = lean, but do check the condition of the plugs and the vacuum system first, it might not be a simple mixture setting that's causing the problem.
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1977.5 924 "Martini" head / New Old Stock rebuild
1985.5 944 Why? Because I can.