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Culprit of idle search?

 
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Old 01-27-2011, 11:41 AM
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Culprit of idle search?

Hey guys, can anyone give me an idea of what to look for;

Since I've had the car the ludes idle when put into nuetral will go from 700 rpm to 1100 rpm and settle at 900. Is a slow process, it takes it nice and easy. Would this be considered searching for an idle? Possibly the iacv, or ecu?
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Old 01-27-2011, 01:04 PM
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Re: Culprit of idle search?

the FINAL idle problem thread!!!!!
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Old 01-27-2011, 03:23 PM
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Re: Culprit of idle search?

That does not help... but thanks.

I need to know if a sesnor's ohms will usually fluctuate with heat? My IACV ohms were 13.5 cold, and 15.0 once I ran the car to temp. Would this be considered normal?

I am picking up another iacv, I dont like how the ohms either way are so close to the max range, it might be enough to hickup the car's idle when it wants to, at temp.
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Old 01-27-2011, 07:28 PM
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Re: Culprit of idle search?

I'm going f`in insane now, I have no idea.

I picked up an IACV from the junk yard, accord model, and the ohms read a flat 12.0. Not bad, better then what I had, so I go to install it and the car starts off (2 bars of temp already since I just ran it) at 2.2k rpm, drops to 2k and the bounces, a lot worse then before. Doing my PCV valve line clamp trick did nothing.

So I went back with my old IACV, same thing, high idle, crazy bounce. I go to plug the top hole on the TB and it stops. So the valve in the IACV isn't working. I test each one with wires and a battery, each valve is clicking how it should.

Wtf? Could the car be sending the wrong volts to the plug, and telling it to stay open all the time? Any idea what the plug volts should read?
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Old 01-27-2011, 07:49 PM
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Re: Culprit of idle search?

I had the same problem, with the car on disconnect the PCV, if it idles like it had insane cams it's a vacuum leak. Mine was my intake manifold gasket. It could also be your TB gasket. Idle problems are a bitch.
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Old 01-27-2011, 09:06 PM
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Re: Culprit of idle search?

Yeah i was having the same problem, so i decided to take my engine out replace all the gaskets and vacuum hoses since they are bound to be reduced to **** from 1992
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Old 01-27-2011, 10:10 PM
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Re: Culprit of idle search?

Solved for right now, idiot me unplugged a line when messing with the valves, which caused the massive change. With the junkyard iacv it seems to not search for the idle anymore. Will drive it in a but to check the erratic idle.
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Old 01-27-2011, 10:28 PM
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Re: Culprit of idle search?

just a qusetion, but have you bled your coolant?
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Old 01-27-2011, 10:37 PM
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Re: Culprit of idle search?

Yep, im far down the list. I think the iacv worked.
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Old 01-27-2011, 10:57 PM
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Re: Culprit of idle search?

awesome! mine was doing that as well, ended up being a bubble in my coolant lines.
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Old 01-28-2011, 12:51 AM
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Re: Culprit of idle search?

glad ya got it
had me confused too reading what going on
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Old 01-28-2011, 12:12 PM
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Re: Culprit of idle search?

I would highly suggest anyone who's having an erratic idle, at temp, and only conditional, to check their IACV ohms. A meter is 5 dollars at any hardware store.

When cold, the ohms were at 13.5, and once ran for some time the heat of the engine bay caused to ohms to spike to 15. The range is 7-13/14, it varies, but being so far close to the max setting can cause idle hickups.

I dismissed the IACV cause I had no CEL. Ohms resistance will not throw a CEL it seems, protip. ;)
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Old 02-07-2011, 11:59 PM
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Re: Culprit of idle search?

Hey man glad you found your idle problem I think I might of finally solved mine too. I was messing with my sensors serring which unplugged effected the idle only one was my map sensor. So unscrewed the sensor saw some black stuff sprayed done carb cleaner in it and no more bouncy idle. Butttt of course if its not one thing its another after wards I drove 20 miles and my gas gauge dropped 4 notches . I'm really hoping I didn't screw something up with my a/f ratio. Any opinion on that would be great if you or anyone else reading this might have one.
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