89 Mazda B2200 Won't hold idle

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  #1  
Old 09-10-07, 11:27 AM
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89 Mazda B2200 Won't hold idle

I have a 89 Mazda B2200 pickup truck that is carburated. The truck won't idle by itself unless I keep giving it gas with the pedal. Any ideas how I can fix this?
 
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  #2  
Old 09-11-07, 06:14 AM
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Some thoughts:

Vacuum line cracked/disconnected.

Engine choke only "pulling off" (opening and remaining open) when throttle is deployed, otherwise it closes again when it shouldn't be. But if your problem occurs when engine is cold and not just when warmed up, this may not be it.

Plugged carburetor idle jet.

Float level out of adjustment.

Engine timing issue. But if it were that, I'd think you'd notice other performance issues. BUT, if you have an engine vacuum problem of any sort, this may affect the timing advance/retard, also.

PCV valve sucking in too much blowby gases or engine oil at idle.
 
  #3  
Old 09-14-07, 04:31 PM
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It seems to be happening on cold startups. When the car is warm it holds the idle. It's a little rough but the car stays on.
 
  #4  
Old 09-14-07, 05:06 PM
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Check the choke for starters, in that case.
 
  #5  
Old 09-16-07, 08:59 PM
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set choke?

You set the choke before you start?
Depress pedal to floor and let up completely before turning key to start?
 
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