- Jul 26, 2013
Now those are problems you LIKE to find! LOL
Thank goodness it was just fugged up wiring. Saved you hundreds! Plus a big PITA if you had to change out anything on the carb. Good job!Now to figure out this exhaust leak.
Thank you for the info!!! Yes, the leak is coming from driver side, only when accelerating. I’ll check the gaskets at the efe valve/exhaust manifold. Thank you!!!Thank goodness it was just fugged up wiring. Saved you hundreds! Plus a big PITA if you had to change out anything on the carb. Good job!
Now, as for the exhaust leak, I'm going to assume the pipes aren't rusted out.
If it's on the passenger side, it's very likely the donut gasket. The crossover pipe is unlikely, as there are metal flange seals there. Possible, but unlikely. The donut gasket is held on by 3 bolts with springs.
On the driver side, if it's coming from there, the most likely spot is the flat gasket between the EFE valve and the exhaust manifold. It's a simple gasket with 2 bolt holes. But this one is mounted with studs that go through the EFE valve and the crossover pipe flange. If you have to drop the pipes, use plenty of PB Blaster or similar penetrating fluid and let it soak in well. You twist off the bolts/studs you'll be taking off the exhaust manifold to fix it more than likely.
Donut- GM p/n 1262500. Or Felpro 60240 at the big box stores or Rockauto.com
View attachment 146574
EFE flange gasket- GM p/n 22526988, or Fel-Pro 60771 at the big box stores or Rockauto.com.
View attachment 146573
Thank you! I did check the vacuum hoses and one just broke off...one the hoses from valve behind AC compressor.Yeah, you really need to isolate the leak.
My guesses were based on no pipe rust throughs, but as ssn696 said, a bad/rusted through/cracked AIR line to the head could leak and cause spitting as well. Also, the check valves on those AIR pipes going to the heads LOVE to burn out and leak exhaust back through the AIR system. They're supposed to keep exhaust gases from getting back to the AIR pump, but if you feel the hoses from the valve behind the A/C compressor mounted on the head, those hoses should be relatively cool to the touch. If they're very hot when the engine is warm, you got at least ONE check valve not checking. There's 3. One to each head, and one to the cat converter. Check valve is located on a pipe next to the transmission dipstick. That diverter valve behind the A/C compressor is made of plastic/rubber diaphragms so it won't hold up to the exhaust heat for too long.
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