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Again with the bouncing idle... Under the throttle body, there's sort of a little vacuum "manifold." There are 3 metal vacuum lines that point towards the front of the car. As you're facing them, looking toward the back of the car, the one that's on the left (actually on the right side of...

I've finally had a chance to look back at this car. I've completely disassembled the fast idle valve but everything looks okay. I assume that the coolant in the bowl on the bottom gets hot as the engine warms up, but I don't understand how that connects to the chamber in the middle. Inside...

I pulled off the FITV yesterday (is this equivalent to the IACV on later cars?), but the engine was still hot so I didn't disconnect the coolant lines. I sprayed carb cleaner into the two holes that fit against the throttle body. I didn't see the plunger you're talking about. I'll try it...

Just tried that, no air came out that I could see, idle is the same as before. -Eric

With the engine running I tried pushing on both the small upper and larger lower butterflies in the intake and couldn't get the bouncing to stop, it stayed the same. I tried cracking the cover of the idle solenoid, I even took it off, but the engine continued to run the same. There's a lot of...

One more question, I think I have an electronic tach somewhere in my shed that I can use to double-check the accuracy of the tach in the dash, but off the top of your head do you know what the tach of an 86 Civic Si should read at a particular speed in fifth gear? -Eric

OK, another mechanic had pointed out the idle solenoid (without naming it) and suggested that I take the cap off it and make sure it was clean inside. Is there anything else I can do to make sure the air is bled out of it? From what you're saying, it sounds like coolant is supposed to be going...

Hello, I have an 1986 Civic Si, it's currently my only running car, but I don't drive it much. It has a couple problems. The main one is that the idle is erratic. When it's cold it's not too bad it fluctuates a little bit, but after it warms up it goes up and down up and down, fluctuating...