Idle wanders when heater is on

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Oct 26, 2007 | 11:09 PM

Blister

Thread Starter

Junior Member

Joined: Sep 2007

Posts: 6

Likes: 0

From: Camanche, Iowa

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.

Oct 27, 2007 | 04:11 PM

torkum

Senior Member

Joined: Dec 2005

Posts: 2,426

Likes: 2

From: Lebanon,TN

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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