Idle wanders when heater is on

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10-26-2007, 11:09 PM

Blister

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Idle wanders when heater is on

Hey guys my idle is wandering from 700 to 900 rpm when I put my heater on anything but "floor", obvious noise like something is kicking in also. Any ideas?

This is a 2001 F150 with a 5.4.

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10-27-2007, 04:11 PM

torkum

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Sounds like a small vacuum leak, maybe from the main vacuum line behind the battery going into the firewall. This is a common area for the line to crack or break.

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