idle drops and cuts off - Honda Accord Forum - Honda Accord Enthusiast Forums

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Old 05-14-2008, 02:53 PM
JimBlake's Avatar
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Default RE: idle drops and cuts off

Maybe a dirty IACV?

You need to tell us what engine. V-6? 4-cyl VTEC? Non-VTEC? ULEV?
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Old 05-14-2008, 11:59 PM
Join Date: Nov 2004
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Default RE: idle drops and cuts off

Have you had the ignition switch recall?
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Old 05-15-2008, 12:09 AM
JimBlake's Avatar
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Default RE: idle drops and cuts off

Flaky ignition switch would make it cut off, as if you had turned off the key.

Dirty IACV would make unsteady idle. RPM down & up & sometimes stall.
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Old 05-15-2008, 10:08 AM
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Default RE: idle drops and cuts off

Lots of heavy keys seem to have something to do with the switch problems, but probably the switch can have problems even without lots of keys. Besides, a previous owner might have had lots of keys.

We can't watch & listen to the car from here, so we have to ask a lot of annoying questions...& weneed details.

Does the idle speed go up & down before it stalls? Or is the idle just nice & steady then suddenly stalls? (You haven't really answered that question.)

If the idle speed control system is NOT screwing up, then you just confuse things byscrewing withthe idle speed. You need to figure out what's causing it. Or start byexplaining what you've done or observed that can RULE OUT any of these things...
- idle control system screwing up
- spark shorting from bad/decayed plug wires/cap/rotor
- old/fouled sparkplugs (Hondas don't like Bosch)
- crappy fuel or incorrect fuel pressure

IF the idle controls are messed up,there's a procedure for setting the "BASE" idle (which isnotthe 750rpm operating idle). But first you (or your shop) needs to fix or rule out a handful of things...
- find & fix ANY vacuum leaks
- clean throttlebody, especially crud where the throttle closes against the bore
- remove any air pockets from the cooling system
- make sure your TPS is working properly
- make sure the throttle cable has some slack
- make sure the physical stop of the throttle shaft doesn't hold the throttle open (just barely enough to prevent jamming)

Then you set it like this...
- warm up theengine completely
- jumper the SCS connector
- unplug the wiring harness from the IACV (it'll almost stall)
- adjust idle air screw for 500rpm
- shut off & cool down
- reset ECU (pull fuse #13 at right-front door hinges)
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