OK, ya'll. I'm starting to get to the end of the rope here on figuring out my idle dip problem. The car runs fine except when ideling it will dip randomly (say usually 1 or 2 times during a typical traffic light wait) down to 200RPM or so and pop right back up to 700. It dips so low that it sounds like it will ALMOST stall but never does. Here's all the things I have done so far, and none have had a single bit of impact on the problem:
-Clean MAF
-New coil packs
-New spark wires
-New spark plugs
-New air filter
-Replaced intake air tube (was throwing a lean mixture code... this fixed it! But.. idle problem didn't change)
-Replaced EGR valve
-Ensure EGR tube is clean and clear, as well as passes in the intake.
-Replaced IACV and had cleaned passages in the throttle body while it was off.
-Replaced PCV valve
-Visually inspected all vacuum tubes. Replaced one of that that looked a little brittle but wasn't cracked.
I just don't know what else to do here! It just seems crazy to me. No codes getting thrown. Car runs fine, but it just won't idle right. WTF?!
-Clean MAF
-New coil packs
-New spark wires
-New spark plugs
-New air filter
-Replaced intake air tube (was throwing a lean mixture code... this fixed it! But.. idle problem didn't change)
-Replaced EGR valve
-Ensure EGR tube is clean and clear, as well as passes in the intake.
-Replaced IACV and had cleaned passages in the throttle body while it was off.
-Replaced PCV valve
-Visually inspected all vacuum tubes. Replaced one of that that looked a little brittle but wasn't cracked.
I just don't know what else to do here! It just seems crazy to me. No codes getting thrown. Car runs fine, but it just won't idle right. WTF?!
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