Focus Fanatics - View Single Post - 2001 Ford Focus SE Zetec DOHC Idle Rough, Erratic, & Stumbles
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Old 06-21-2012, 02:56 PM   #7
mpcv2000
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Join Date: May 2005
Fan#: 23629
Location: Montreal Canada, United States
What I Drive: 01 SE + 1989 RX7

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I've found the problem this morning.
There is a hose behind the intake ( Vacuum ) that when engine is warm ( hose is warm too ) the hose colaps on itself and the engine start running very rough and then die.
When I reset the ECU it gives time for the hose to cool down and retake it's shape.
When the engine does it , just grab the hose behind the intake and squeez it the other way it is collapsed and the motor will run like it should.
I have put a worm gear clamp over it so it doesn't collaps until I get the hose from Ford.

I had this issue with a 00 ZX3 a while back and I kind of forgot about this "infamous" vacuum hose collapsing on itself .
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