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Old 08-07-2014, 06:30 PM   #1
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1999 Focus 2.0l, idle issue

Hi, I've just got a dirt cheap 2.0l Mk1 focus for my girlfriend, it has a little issue, the idle is very slightly rough, and also it sometimes cuts out when you come to a stop.

I've read this is either the Idle Control Valve, or the Vehicle Speed Sensor.

I've ordered the ICV first since it's only 23 and easy to fit, and if that doesn't work I'll replace the VSS, however does anyone know of anything else it might be?

Many thanks.


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Old 08-08-2014, 12:43 AM   #2
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Moved to General Tech Chat - Welcome to FF

Getting back to this one, rough running isn't going to be fixed by replacing the IAC valve even if that helps the stalling (and it's not the first thing to check/replace).

I'd want to know the compression is good with a test, spark plugs are likely due as well as fuel filter & maybe air filter. Plug wires & even Coil/coil wiring is suspect depending how bad the rough running symptoms are.

Zx3WV has mentioned the vacuum leak possibility, PCV hose is the most common for rough running/stalling there.

Needs some thorough checking over & maint. to be dependable.
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Old 08-08-2014, 12:58 AM   #3
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It sounds to me like it could be a vacuum leak. get a can of carb cleaner and spray around the intake mani and around vacuum lines while the car is running and see if there is any idle change.
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Old 08-08-2014, 04:33 AM   #4
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It's a very mild roughness, you can just hear a slight uneveness, if you weren't a car guy you wouldn't even notice.

Vacuum leak is posible, it does have those types of sympthoms, I'm going to replace that PCV hose when I do the ICV, I imagine a little bit of hose is only a few quid.
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Old 08-08-2014, 05:11 AM   #5
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That's a plus, doesn't change the list of possibilities but it tends toward the simple/minor maint. type as the more likely ones for a fix.

We see so MANY that have problems in this section, when "cheap/used/problems" are seen in a description there's a tendency to cringe a little.

Luck getting it in good nick.

Cheers
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Old 08-08-2014, 08:03 AM   #6
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Vehicle speed sensor will have nothing to do with any of that, its' output is zero when car sitting idling.

While Idle control valve does control idle speed, it has no effect at all on 'rough' idle or cylinders dropping out irregularly to speed up/slow down the engine momentarily. That happens so fast the ICV cannot respond quick enough to correct it.
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Old 08-11-2014, 02:49 PM   #7
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I think I've figured the issue.

Installing a new ICV valve did actually improve things completely when cold, now there is just an issue when hot.

The problem I think lies with the PCV hose as mentioned above, it's not split, however the rubber near the bend that goes into the inlet manifold is very soft. As the engine gets hot it softens it even more and then under the suction it closes causing the engine to stall.

I've ordered a new hose for 14 delivered, fingers crossed!


Has anyone had this fault before?
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Old 08-11-2014, 10:37 PM   #8
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That's a common fault, the softness can cause a collapse when warm as you noticed.

Rough running/stalling being caused by a bad PCV hose is seen often here.
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Old 08-11-2014, 11:47 PM   #9
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When soft enough they can suck a pinhole that reseals to drive you crazy too, the engine runs like crap then cures itself till next time. Next time may not be for a month.
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Old 08-13-2014, 11:13 AM   #10
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http://www.gomog.com/allmorgan/ZetecIdleIssue.htm

This is a useful link.

If it isn't the PCV pipe, I guess I should try the Crankcase Breather Valve, it's lucky all these things are cheap, although that does look like a pain the change.
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