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1990 5.0l Bronco idling problem

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1990 5.0l Bronco idling problem

 
  #1  
Old 10-26-1999, 07:32 PM
91Bronco
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1990 5.0l Bronco idling problem

 
  #2  
Old 11-09-1999, 03:45 PM
lonewolftom
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1990 5.0l Bronco idling problem

I recently bought a 1990 Ford Bronco with 83,000 miles on it. It was maintained but has a odd problem with idling. It will start even in cold weather at high idle, but when it drops down it stalls out. After a restart it will idle but at a low RPM (about 500). I can tell it is idling low because the headlamps grow brighter when the accelerator is depressed. If I depress the accelerator and let off it will drop to almost stalling, bounce back up to about 800 RPM, then float up and down to almost stalling and level off at 500 RPM (too slow?). When it warms up it is not as bad but still has the problem. Anyone know what it could be? TPS, Bypass valve?, etc. HELP!!
 
  #3  
Old 11-09-1999, 04:57 PM
Phillip Guidry
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1990 5.0l Bronco idling problem

start by SCRUBBING the throttle bores clean with solvent & a brush & a rag,while holding the plates wide open. Also disassemble the air bypass for a thourough cleaning(you may break the gasket!).These are 2 places that get sprayed often,but never SCRUBBED. It does make a difference.
Phillip
ps. Try some new plugs also
 
  #4  
Old 11-13-1999, 09:23 PM
Tom1.0
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1990 5.0l Bronco idling problem

THANKS PHILLIP!!!

It worked! My Bronco is running like a champ now!

 
  #5  
Old 11-15-1999, 10:19 AM
Phillip Guidry
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1990 5.0l Bronco idling problem

Congrats ! You have gained experience that is invaluable.The scrubbing of the throttle bores works for every vehicle,even carberated ones.Try it on all your engines.
Phillip
 
 
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