Quote:
Originally Posted by 57NAPCO
Changed...iac, tps, rebuilt TBI and new base gasket, pulled the egr and it’s not froze up,
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Let's go through these one by one:
1. IAC--did you make sure you removed all the old gasket material/replace the IAC gasket when you changed this? That is a potential vacuum leak. Also, did you have the idle problem before you changed the IAC?
2. TPS--did this affect your idle in any way? Unless defective, it shouldn't.
3. Rebuilt TBI--Did you rebuild your throttle body or install a rebuilt unit? The BBC's had two different base footprints over the years. If the base footprint of your throttle body doesn't match the gasket you used and the mounting surface on the intake manifold that could cause a big vacuum leak.
4. Pulled the EGR--Did you replace the gasket when you reinstalled?
5. Have you tried capping off each vacuum tap from the throttle body/intake manifold one by one? If you have a leak in one of the lines, doing this will help you find it because with the IAC unplugged as you have it now you would cut off the air and the engine should almost stall.