Jeep YJ Forum Second generation of the classic Jeep - manufactured from 1987 till 1995. Known by their square headlights.

89 yj 4.2 misfire coldstart idle

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Old Jun 4, 2012 | 11:19 AM
  #11  
james.mc's Avatar
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From: Paderne, Algarve, Portugal. Moving to Vic, BC eventually!
Default Re: 89 yj 4.2 misfire coldstart idle

five points

Sounds like you might have a lot of crud in the carb already. A new fuel filter won't stop stuff already in your carb from blocking the idle tubes. Try taking the top off the carb and cleaning out any rubbish you find in there and then clean the idle tubes again.
Old Jun 4, 2012 | 10:43 PM
  #12  
five points's Avatar
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From: southern Ontario
Default Re: 89 yj 4.2 misfire coldstart idle

Originally Posted by james.mc
five points

Sounds like you might have a lot of crud in the carb already. A new fuel filter won't stop stuff already in your carb from blocking the idle tubes. Try taking the top off the carb and cleaning out any rubbish you find in there and then clean the idle tubes again.
Thanks ill give that a go. rob
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