Honda Accord (1990 - 2002) Includes 1997 - 1999 Acura CL

1991 Honda Accord Ghost Revving

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Old Nov 19, 2019 | 12:19 PM
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Default 1991 Honda Accord Ghost Revving

New IAC, new hoses, no air leaks that I can tell. "Burped" the damn thing excessively. It still ghost revs... I'm using a no spill funnel. It also "Surges" when trying to burp it after about 10 min.
Can anyone help?
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Old Nov 19, 2019 | 06:45 PM
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Default Re: 1991 Honda Accord Ghost Revving

If you unplug the IACV while the engine is ghost revving, what does the idle do?
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Old Nov 26, 2019 | 12:10 AM
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Default Re: 1991 Honda Accord Ghost Revving

Sorry, went out of state for a minute.. If I unplug it, it runs rough.. When I plug it back in, it does a super fast ghost rev..
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Old Nov 26, 2019 | 03:50 PM
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Default Re: 1991 Honda Accord Ghost Revving

Originally Posted by zenwizard42
Sorry, went out of state for a minute.. If I unplug it, it runs rough.. When I plug it back in, it does a super fast ghost rev..
By "rough" do you mean very low rpm's and sort of stumbling like it wants to quit?

If that is the case, your IACV seems like the cause of the super fast idling. Cleaning the IACV might work, but if it is an original part on a '91, it might have reached the end of its life.

Update: You said the IACV is "new," but you should still check it. Also check the FITV, Fast Idle Thermal valve. It slows the idle as the engine warms.

Last edited by brakedrum; Nov 26, 2019 at 07:20 PM.
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Old Nov 28, 2019 | 12:49 AM
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Default Re: 1991 Honda Accord Ghost Revving

Originally Posted by zenwizard42
It also "Surges" when trying to burp it after about 10 min.
Can anyone help?
There is a misconception that the engine must be running to bleed the coolant on a Honda with a bleeder screw. This is false. Running the engine while bleeding the coolant is messy at best, or you may allow air to stay trapped in the system which can lead to overheating.

You bleed the system with the engine off/cold.
Car should be parked on a flat level surface.
Open bleeder screw, for less mess attach a clear vinyl tube(fish store if not hardware store) to the bleeder tip.
Watch for no bubbles, a long enough hose the coolant will just level out and you can watch the coolant for air bubbles,
Open radiator cap, verify the rad is full.
Gently squeeze the upper hose and note if any air comes out of the bleeder nipple.
If no air or bubbles, close bleeder screw. remove tube.
Verify radiator is full.
Verify coolant reservoir tank is properly filled.
Close radiator cap and radiator reservoir.

Start engine and allow to warm up.
Watch temp gauge, it should settle slightly below the mid way point on the gauge.
Look for any leaks.
Close the hood and wait for the cooling fans to come on(idling) while watching the temp gauge.
If all seems well go for a test drive.

Originally Posted by zenwizard42
If I unplug it, it runs rough..
With the engine fully warmed up.
Remove the air intake hose to the TB.
Start engine.
Place your finger over the IACV intake port inside the TB.
This will block off the IACV completely. If the IACV is not returning to it's full rest position it may cause a false base idle speed.
If the engine rpm drops but runs rough then there is something else going on with the engine.
Engine should run smoothly.

Verify the TB throat and butterfly valve are clean.
Verify the ignition system is in proper order.
Verify the valves are properly adjusted.
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