Weird Idle - 1990 Acura Legend sedan - HondaClub.com

richmeier · 08-31-2007, 08:19 PM

1990 Acura Legend sedan, 5-speed, base model, 275k

Engine idles too high at start (1,200 - 2,500 RPM), takes too long to get to normal idle (800 - 900), and will idle higher even when warm. It doesn't surge (high, low, high, low); instead, it will just suddenly idle higher-than-normal, and then gradually idle goes down. The problem gets much worse in colder weather, but still tends to normalize as engine temperature increases. Checked computer, and code (14) seemed to suggest air/idle control valve. However, I have since replaced this part, reset, and problem persists. I have also cleaned the intake manifold using a chemical deposit remover. Engine is pretty well maintained, and this problem seems isolated. But I have not been able to pinpoint. Any help would be appreciated. Thanks in advance, Rich
703-338-4868.

**EyesofFreedom** · 09-04-2007, 12:43 AM

Just a shot in the dark but a failing EGR valve can do this and not throw a diagnostic code.

The problem is that it is a rather pricey part to replace on a hunch.

Nothing else has changed recently....moved....different gas station...another new driver using the car...

**project_91Accord** · 09-10-2007, 07:25 PM

well what motor is in it? There is a IAC valve and fast idle thermo valve I believe the name is... Have you tried to replace that?I had to replace both on my 91 accord... Hope the problem gets fixed...

08-31-2007, 08:19 PM	#1 (permalink)
richmeier Junior Member Join Date: Aug 2007 Posts: 1	Weird Idle - 1990 Acura Legend sedan 1990 Acura Legend sedan, 5-speed, base model, 275k Engine idles too high at start (1,200 - 2,500 RPM), takes too long to get to normal idle (800 - 900), and will idle higher even when warm. It doesn't surge (high, low, high, low); instead, it will just suddenly idle higher-than-normal, and then gradually idle goes down. The problem gets much worse in colder weather, but still tends to normalize as engine temperature increases. Checked computer, and code (14) seemed to suggest air/idle control valve. However, I have since replaced this part, reset, and problem persists. I have also cleaned the intake manifold using a chemical deposit remover. Engine is pretty well maintained, and this problem seems isolated. But I have not been able to pinpoint. Any help would be appreciated. Thanks in advance, Rich 703-338-4868.

09-04-2007, 12:43 AM	#2 (permalink)
EyesofFreedom Official Instigator! Join Date: Jun 2006 Posts: 2,103	Just a shot in the dark but a failing EGR valve can do this and not throw a diagnostic code. The problem is that it is a rather pricey part to replace on a hunch. Nothing else has changed recently....moved....different gas station...another new driver using the car... __________________ Myspace me... http://www.myspace.com/hondaclub_eyesoffreedom Ferio Project car build page... http://www.my2002ex.mysite.com My other passion... http://www.nscale.org/defaulteng.htm

09-10-2007, 07:25 PM	#3 (permalink)
project_91Accord Senior Member Join Date: Mar 2007 Posts: 204	well what motor is in it? There is a IAC valve and fast idle thermo valve I believe the name is... Have you tried to replace that?I had to replace both on my 91 accord... Hope the problem gets fixed... __________________

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