# 1989 jeep grand wagoneer V-8/360

**URL:** <https://community.cartalk.com/t/1989-jeep-grand-wagoneer-v-8-360/6662>\
**Category:** Maintenance/Repairs\
**Tags:** rough\
**Created:** [October 31, 2007, 7:01pm UTC](https://community.cartalk.com/t/1989-jeep-grand-wagoneer-v-8-360/6662 "2007-10-31T19:01:25Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![sja1957](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/sja1957/32/394_2.png) [@sja1957](https://community.cartalk.com/u/sja1957)\
**Post date:** [October 31, 2007, 7:01pm UTC](https://community.cartalk.com/t/1989-jeep-grand-wagoneer-v-8-360/6662/1 "2007-10-31T19:01:25Z")

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runs very rough/dies when engine is cold. as engine warms up, it runs fine  
  
  
  
 any idea where to look for a solution?

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**Author:** ![Roadrunner](https://avatars.discourse-cdn.com/v4/letter/r/d2c977/32.png) [@Roadrunner](https://community.cartalk.com/u/Roadrunner)\
**Post date:** [November 1, 2007, 4:25am UTC](https://community.cartalk.com/t/1989-jeep-grand-wagoneer-v-8-360/6662/2 "2007-11-01T04:25:40Z")

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Could be a fuel/air mix fault.

Perhaps the engine temp sensor (if so equipped) is giving the computer the wrong info.

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**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\
**Post date:** [November 1, 2007, 5:33am UTC](https://community.cartalk.com/t/1989-jeep-grand-wagoneer-v-8-360/6662/3 "2007-11-01T05:33:38Z")

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Is it carburetted or fuel injected? Sounds like a carb with a bad choke pull-off…

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**Author:** ![edb1961](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/edb1961/32/122_2.png) [@edb1961](https://community.cartalk.com/u/edb1961)\
**Post date:** [November 1, 2007, 1:40pm UTC](https://community.cartalk.com/t/1989-jeep-grand-wagoneer-v-8-360/6662/4 "2007-11-01T13:40:46Z")

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When you start the car the choke plate in the carb is completely closed. When the car start the choke pull-off opens the plate about ~1/4". If the plate doesn’t open, the carb doesn’t get enough air and the engine is going to run real rough. As the engine warms up the choke will open the choke plate normally. Rochester (GM) had a vacuum diaphragm on the carb to do this. My 83 Mustang GT’s Holley carb used a metal housing with a brass piston that used to stick all the time.

Here is a link for carb troubleshooting.  
[http://mysite.verizon.net/vzep121w/ronspitstop/id14.html](http://mysite.verizon.net/vzep121w/ronspitstop/id14.html)

Ed B.