I pulled off a thing-a-ma-bob toward the rear of the intake plenum thinking it was the ECM controlled idle actuator, :dunno: might be.... So I snapped these pic hoping someone would see the correct part in question so I could R/R it to ensure it's functioning properly. Thx

http://i110.photobucket.com/albums/n85/CPUNeck/Honda/th_p1030640.jpg (http://s110.photobucket.com/albums/n85/CPUNeck/Honda/?action=view&current=p1030640.jpg) http://i110.photobucket.com/albums/n85/CPUNeck/Honda/th_p1030639.jpg (http://s110.photobucket.com/albums/n85/CPUNeck/Honda/?action=view&current=p1030639.jpg) http://i110.photobucket.com/albums/n85/CPUNeck/Honda/th_p1030638.jpg (http://s110.photobucket.com/albums/n85/CPUNeck/Honda/?action=view&current=p1030638.jpg)

http://i110.photobucket.com/albums/n85/CPUNeck/Honda/th_p1030637.jpg (http://s110.photobucket.com/albums/n85/CPUNeck/Honda/?action=view&current=p1030637.jpg) http://i110.photobucket.com/albums/n85/CPUNeck/Honda/th_p1030636.jpg (http://s110.photobucket.com/albums/n85/CPUNeck/Honda/?action=view&current=p1030636.jpg) http://i110.photobucket.com/albums/n85/CPUNeck/Honda/th_p1030635.jpg (http://s110.photobucket.com/albums/n85/CPUNeck/Honda/?action=view&current=p1030635.jpg)

http://i110.photobucket.com/albums/n85/CPUNeck/Honda/th_p1030633.jpg (http://s110.photobucket.com/albums/n85/CPUNeck/Honda/?action=view&current=p1030633.jpg) http://i110.photobucket.com/albums/n85/CPUNeck/Honda/th_p1030632.jpg (http://s110.photobucket.com/albums/n85/CPUNeck/Honda/?action=view&current=p1030632.jpg) http://i110.photobucket.com/albums/n85/CPUNeck/Honda/th_p1030631.jpg (http://s110.photobucket.com/albums/n85/CPUNeck/Honda/?action=view&current=p1030631.jpg)

http://i110.photobucket.com/albums/n85/CPUNeck/Honda/th_p1030630.jpg (http://s110.photobucket.com/albums/n85/CPUNeck/Honda/?action=view&current=p1030630.jpg)

CPUNeck:

LAST pic you present is the "idle control" VALVE, mounted on the backside of the throttle body. It is similar to/same as the one on my trusty '86. Heated coolant circulates through the ICV, causing it to move up/down, depending upon temperature. The piston inside has a wax-plastic coating which can stick/jam, causing idle issues.

While I cannot say for sure, you may need to replace it.

Check the IAT (Intake Air Temperature) sensor. It's mounted SOMEWHERE on the front of the intake manifold. (Mine is located on the driver's side of the intake and has a green-capped, two-conductor connector on it.) The IAT sensor dramatically affects idling, especially after the engine reaches normal operating temperature. A "wandering" idle is often indicative of a faulty IAT sensor.

I apologize, in advance, that I am unable to be more helpful. Just that I know the 1986-1987 fuel-injected engines far better than the 1988-1989 fuel-injected engines. Check with a Honda tech or the service manual to correctly identify those parts you have in question.

Thanks, I understand how the coolant actuated bleed valve could be used for increasing idle in open loop operation (it's basically a thermostat connected to a plunger.), I guess I'm missing how the engine management system raises the idle when a load is sensed. There's no way the temperature difference in the coolant from placing a load on the engine could, could be picked up by that high tech thing-a-ma-bob I'm holding:D.

I'll have to do some more research and report back. One time when I switched on the A/C, the engine idled up PERFECTLY!, I mean like the exact amount so there was almost zero perceivable RPM changes, and no shake. The tach didn't even jump a little... rock solid. Then most of the time, it'll shack like a bucking Bronco, and I'll loose ~150-250 RPM. This tells me there is something to handle that requirement, and that it's intermittent. read dirty/carboned, maybe just in need of some TLC/Cleaning.:yes: I'll see what happens.

Thanks, I understand how the coolant actuated bleed valve could be used for increasing idle in open loop operation (it's basically a thermostat connected to a plunger.), I guess I'm missing how the engine management system raises the idle when a load is sensed. There's no way the temperature difference in the coolant from placing a load on the engine could, could be picked up by that high tech thing-a-ma-bob I'm holding:D.

I'll have to do some more research and report back. One time when I switched on the A/C, the engine idled up PERFECTLY!, I mean like the exact amount so there was almost zero perceivable RPM changes, and no shake. The tach didn't even jump a little... rock solid. Then most of the time, it'll shack like a bucking Bronco, and I'll loose ~150-250 RPM. This tells me there is something to handle that requirement, and that it's intermittent. read dirty/carboned, maybe just in need of some TLC/Cleaning.:yes: I'll see what happens.

Using the crank angle sensor, the ECU can "see" the engine RPM. When a load is added to an engine, the RPM drops if nothing is changed. Since the ECU's pretty much get feedback from, or control the various elements of car operation, the ECU knows when the load increases, and is programmed to respond accordingly. I am not as sure about the pre-1990 Accords, as I haven't studied them as much, but on 90 and newer, the ECU is responsible for A/C engagement etc, so it adjusts the idle by opening and closing the IACV to maintain the appropriate idle speed.

Well that is how I understand the ECM to work. I just can't find any actuators capable of effecting change for the RPM deficiency. The only thing I haven't removed is the apparatus in the front of the intake plenum just aft of the injector rail. If that's not is (and it doesn't look like it) I'm lost. I have no idea how the computer expects to idle this thing up.:dunno:

Interesting picture of that HEUI injector in your avatar? Any significance?

Fred, as a matter of fact.... that symbolizes my entry into the realm of true renewable energy, via bio fuel, straight vegetable oil (SVO). And one of the most durable, intuitive, high pressure fuel delivery systems available:thmsup:, Oh and it's no slug, ~383rwhp!