# Purrs like a big cat

**URL:** <https://community.cartalk.com/t/purrs-like-a-big-cat/43466>\
**Category:** Maintenance/Repairs\
**Tags:** ranger, ford\
**Created:** [January 30, 2010, 4:30pm UTC](https://community.cartalk.com/t/purrs-like-a-big-cat/43466 "2010-01-30T16:30:38Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![mskpsm](https://avatars.discourse-cdn.com/v4/letter/m/50afbb/32.png) [@mskpsm](https://community.cartalk.com/u/mskpsm)\
**Post date:** [January 30, 2010, 4:30pm UTC](https://community.cartalk.com/t/purrs-like-a-big-cat/43466/1 "2010-01-30T16:30:38Z")

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My '01 Ford Ranger (6 Cyl, 4WD) makes a purring sound when under load or going up a hill. The sound stops when the truck shifts into a higher gear. My mechanic suggested new spark plugs. Well, the sound is still there but it’s not as loud. I tried higher octane gas but this is not a “knocking” sound so that didn’t help.  
  
 What would?

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**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\
**Post date:** [January 30, 2010, 4:55pm UTC](https://community.cartalk.com/t/purrs-like-a-big-cat/43466/2 "2010-01-30T16:55:24Z")

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Purring under load…an exhaust leak perhaps?

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**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\
**Post date:** [January 30, 2010, 5:01pm UTC](https://community.cartalk.com/t/purrs-like-a-big-cat/43466/3 "2010-01-30T17:01:16Z")

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Have you checked the motor and transmission mounts?