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- Jan 16, 2025
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It won’t let me upload a video, but this an 305 v8. I haven’t cleaned the engine bay throughly yet, but there is smoke coming from the egr valve, when the truck warms up. It doesn’t smoke till about 10-15 minutes. I’m
Smoke from egr valve exhaust On V8
- Thread starter Just a guy who likestruck
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I can't tell from the picture but that looks like some sort of intake set up that pulls air over a warm manifold instead of an EGR?
Agree. And the exhaust manifold smokes because oil leaking from rocker covers? Just a guess.
It was a common problem on 80s GMs when they went to rtv sealed joints that didn't seal well when aged.
And surprisingly on the 2005 Lexus 330 (aka Camry) I bought for my grandson where the cam cover gaskets are not heat resistant and get hard in their old age and leak.
That’s the manifold heat shield for a carb setup. There is a piece of tubing that goes from that piece to the bottom of the intake snout. It feeds warm air to the carb when it’s cold and a vac door closes it off once it reaches temp.
As mentioned, smoke is from oil on the exhaust manifold.
As mentioned, smoke is from oil on the exhaust manifold.
Those old heat stoves were a good idea for cold climes. I think on Chevys they were branded something like AC AutoThermac.
My older Japanese cars had a manual equivalent - there was a wing nut on the air-cleaner housing, and instructions to slide a moveable panel on the housing to one position or the other depending on ambient temperature (61°F IIRC).
The idea was to duct preheated air to the carburetor in cooler weather.
I think these gadgets, and heat-riser valves, disappeared with the introduction of FI.
Leaky valve cover gaskets, Very common on Gen 1 small blocks with cork gaskets.
