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Old 04-30-2010, 03:25 PM
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Need help out of ideas

First this is not a system idle thread so please don't flame me. This all started with my gasket on my coolant return hose. I fixed the leak but then I think air got into the coolant, so my car started pulsing idle from 12000 rpm to 15000rpm. I bled the coolant but it still kept doing it. after a while of driving it would stop pulsing and idle really ruff at 1k rpm. At this point it would throw a CEL of system idle control malfunction. So I then replaced my iacv valve and it seemed to run better but it idled at a steady 12 to 1500 rpm through all temps. I know some will say not to but I decided to adjust the idle control screw on the TB I got it to sit at a little bit over 1k rpm in doing that but then it started to throw a check engine light. This is the cel it threw multiple cylender missfires for one thing. The one I dont know what it is though is manifold absolute barometric pressure circuit high input.

MY question is does anyone know what that CEL could be related to and also would adjusting the idle lower cause the car to misfire like it is? I did a tune up just a bit ago with new plugs cap rotor wires and it was not misfiring before I changed out the IACV.

Anyone have any clues I'm Kind of stumped I also have read a tone on idle problems so Im not really asking about that more about the CEL. I have also reset the ecu by pulling the 7.5 amp fuse under the hood.

Last edited by jasonjrf; 04-30-2010 at 03:28 PM.
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