High Idle on Startup - ideas?

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Joined
May 22, 2016
Messages
106
Location
Houston
I have a 93 FZJ80. It's round about 275k miles. Oil consumption is about 1 qt per 750 miles.

When I start it up (with the AC on), it idles at about 1800-2000 RPM for about 60 seconds, then drops to 1000-ish. Once I drive it a bit, it idles normally at 600-650.

Related issues:
  • With the AC off, the behavior is similar, but idles at 1400-1500 on startup
  • When I push the brake pedal, the idle increases slightly
  • If I start it up with a hot engine, it is the same, but reduces to the 1000 rpm state after about 15 seconds.
  • Sometimes after driving for a while the idle is low - 400ish
  • Most vacuum lines have been replaced
I'm thinking vacuum leak? What do you think?

Thanks!

Justin
 
Not unusual for OBD I rigs to have less than ideal idle manners. As long as it comes back down fairly soon, I would not worry about it.
 
I have a 94 about the same miles, It’s always done the high idle thing at cold start up, then comes right down.
It has never worried me.
 
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