# '89 Isuzu Trooper Problems

**URL:** <https://community.cartalk.com/t/89-isuzu-trooper-problems/24865>\
**Category:** Maintenance/Repairs\
**Created:** [January 13, 2009, 5:59pm UTC](https://community.cartalk.com/t/89-isuzu-trooper-problems/24865 "2009-01-13T17:59:55Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![herbertificus](https://avatars.discourse-cdn.com/v4/letter/h/e19b73/32.png) [@herbertificus](https://community.cartalk.com/u/herbertificus)\
**Post date:** [January 13, 2009, 5:59pm UTC](https://community.cartalk.com/t/89-isuzu-trooper-problems/24865/1 "2009-01-13T17:59:55Z")

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'89 Trooper: 2.8L V-6 (Chevy) / TBI / Five-speed Manual / 4WD / 277,000 miles  
  
  
  
 When I turn on my defroster, the engine idle soars up to about 2500 rpm and the defroster doesn’t work. I see that the heater unit has a vacuum actuator – probably for the defroster – so I’m guessing the problem is a vacuum leak. I’m currently replacing the vac hoses to the heater. The idle also wanders up and down occasionally and, when revved, the engine takes a while to idle down properly. Any other suggestions or ideas that I might check?