The car is 89 5.0
The problem is when the car is warmed up the idle will hunt.
Between 900-650rpm. The check engine light is not on.
about 3 years ago I changed the O2 sensors. Could they need to changed again?

What do you guys think?

Thanks

 

have you read your cheke engine code ? it can be many things ...
begin to clean your throttle body and IAC (sensor who is attached to TB at 45°) clean your Maf sensor whit brake and electrical cleaner .

after that pull your faulty code

 

Just had the same problem with my taurus. My mechanic buddy cleaned the throttle plate with some kind of carbon cleaner and it works great now.

 

look up the salt and pepper fix....
helped mine quite a bit

 

 

Back in November I cleaned my TB and MAF and the Idle Bypass.
I do NOT have a Check Engine light could there be a code there???


Thanks

 

an old hard code can give you your answer of what s wrong

adjust your idle to 750tr and after your TPS to .98 volt

 

sorry, the salt and pepper fix....
behind the intake you'll find two connectors, one black and one white....over thime they can become coreded on the inside. open them up, clean them, and put them back together and see if that helps...

 

yea ! it s another good thing you can check !

I have already have a trouble of idle up and down and I regulated the problem like that

if i remember the white connector is for sensor like tps , egr , ets , ... and the black one is for the injector

 

I will give that a try thanks!!!