When they bring out the Halloween stuff at Walmart in a few weeks after back to school is done, look for a fog machine. They’re $30. Maybe cheaper on amazon. There’s a great YouTube video on how to use it...I’ll see if I can find it again and post it here
FYI - it works on both vacuum and evap systems. so much passes through the intake manifold and relies on good vacuum!
This isn't the original that I saw, but because it's much more obvious/dramatic, It's worth sharing.
A pleasure- I love sharing offbeat tool suggestions/solutions.
Once you’ve checked for manifold leaks, you can also look for exhaust and evap leaks with the same tool! I’ll bet on a vehicle of that vintage, you’ll find some surprises, no matter how well maintained it has been.
i didn't want to wait for the fog machine, i'll get it later, so i took a chance on the carb fluid to find the vacuum leak. it turned out to be the gasket for the TB. when i got it apart the gasket had somehow got folded in half and one side to the TB was not even sealed.
new gasket, redid the computer reset, drove for about 10 miles; retested for vacuum leaks (none found); I'm still experiencing the high idle. while driving all is fine and when i stop at a corner or light, idle is at 2000. if i pop the peddle it will drop to 1500, but that's still too high. is it possible i need to adjust the stops on the cable pulley's that attach to the TB?
it drives fine and sounds way better than before.
any suggestions are greatly appreciated.
that's a definite possibility, but if you think the throttle plate is being held more open than it should, why not try lubing the throttle cable to see if something within it is possibly holding it more open than it should?
There's also the possibility of EVAP system issues - can you pull that hose off the manifold and cap it temporarily to see if that's an issue?
Further - exhaust leaks can mess with the groove too, especially if there are sticky valves - have you done the paper flap test at the tailpipe?
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