Quote:
Originally Posted by 00LudeSH00
i unplugged the IACV and then started it back up. I still have the engine light on which i assume is from the IACV not plugged in, but its not flashing, but my rpms still bounce a little. they just do short quick bounces maybe from 800 to 1000. Also, does anyone know why when i turn the heater on it blows straight cold air. No warm air comes out. My car warms up as normal. I have the warm air all the way over. I was having a problem with the temperature control on the dash sticking. it wouldnt stay all the way over on the heat side. if i slid it all the way to the right for heat it would slide back towards the cold side about 1/4 of the way to the left. thanks guys
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Ok thats the same thing mine would do. If the revs still bounce then it is most likely NOT a problem with your IACV. Next step is check your coolant system for air bubbles. There's a little bleeder valve on top of the thermostat housing near the EGR valve. Give it a little turn see if anything comes out. You SHOULD get a healthy trickle of antifreeze. IF you get a trickle some bubbles, a trickle some more bubbles you have air trapped in your coolant lines. That WILL cause a bad idle. If you get a good stream of coolant. Go to a parts store, and buy a can of brake cleaner. Start giving it a little squirt here and there around vacuum lines while the engine is running. pay close attention to the intake manifold. Try to give a little spray to every bit of gasket seam you find at the intake manifold. It will start running funny when you find a vacuum leak.
What my car would do.
I would reset the CEL (disconnect ground). Start the car it would run for a while, and usually idle normal if not a little high when cold, until i touched the gas peddle. Then the idle would bounce between 1600 and 800 or there abouts. VROOO-oooom VROOO-oooom, it would drive normal but the idle woul dbounce at lights and stuff. Eventually the CEl would turn on and it would idle like this vrum-vrum-vrum-vrum. It would sit at around 800 and just bounce up and down between 800 and 900-1000. It would run like crap, No vtec, and it would rev down realy fast (8 lb flywheel).
This is the problem:
The Slow reving to 1600 then back down to 800 and back up to 1600 is the ECu compensating for the extra AIR caused by a vacuum leak. It is literally saying in it's little ECU brain "Lean... add gas... too rich... cut fuel... Lean...add gas... too rich...cut fuel." Eventually it goes into limp mode, it stops controlling the idle air control valve (so not enough air getting to engine with TB butterfly closed) and starts idling like crap. With no IACV there's nothing giving it air when you let off the gas between shifts. So the butterfly closes, there's not enough air getting by so the RPM's plummet.
Mine was a dime sized hole in the gasket between the intake manifold and the head right above the port to Cylinder 4. This problem drove me nuts for months until i figured it out.
Here's a video of how it idles with NO cel:
Linear Mode
