Quote:
Originally Posted by optimusprime
Blue may be temp sensor is faulty .Telling computer its hot, and in doing so its weakning out the mixture.Making it run weak. Also it may be fuel related .So a fuel pressure test is needed .Low revs at the lights could be down to bad fuel filter .Have you dhecked the idle control valve .It sits under the filter box .Remove it to look .It as 2 hoses going off from it , these can split ,and a plug on the rear .Remove it from the engine and clean it out with white spirits.Dont sink it in the liquid as it holds electrical items.This can change the tick over if gummed up inside..But if your sure its vacuum then its teasting time ,dont forget the vacuum hose in the front lights.
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Thanks for the suggestions, it helps me conceptualize where I am in the troubleshooting process.
IAC valve is clean. Will test it today by unplugging and noticing the change in idle speed. Also toying with the idea of applying 12 volts momentarily to see if there is a "click"
VACUUM to the headlights? I can only find vacuum ports going to the transmission, the vacuum gage, door locks and one to the ignition system.
I am really toying with the idea of changing the intake manifold boot, and gasket... I do not want to... and I would really enjoy having an engine that gets the best fuel economy, and shifts smoothly.