idle problem

[unger316]

i am having a problem with my bronco idling, it starts up fine but when it starts to idle it revs up and down (between 1100 and 400 rpms) and sometimes when it dips down to 400 its dies. i think its a sensor but if it is im not sure which one it is.

 

[bluesman17]

mine does the same thing, im pretty sure its the TPS (throttle position sensor) but im not sure yet.

 

[2fordbroncos]

thats it!!!!!!

 

[swampthing]

thats it!!!!!!

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Try cleaning out your throttle body with some throttle body cleaner and a tooth brush, and yes it could be the throttle position sensor. My dad and brother had the same problems with their motors and what i just told you cured it for them.

 

[BLADE262US]

The idla air control solenoid could be sticking too . /emoticons/[email protected] 2x" width="20" height="20" />

 

[lymanl3]

Maybe thats whats wrong with mine???? I just replaced the idle air control...and cleaned out the throddle body...Mine is stalling when I come to a stop? Idles fine and runs fine on the highway....could it be the throddle position sensor?

Lyman

 

[BLADE262US]

Heres my story ( lol ) My 89 idles very low when the air conditioning pump turns on it will damn near **** it . I cleaned the IAC ( idle air control ) and the throttle body and it helped a little but still not right . I had a 96 5.0 sitting there so I robbed the IAC off it and as soon as it started it would die wouldnt idle a bit so I checked with my buddy that works at ford and he told me that the newer and some of the replacement IAC,s that you get from the part store have a diode in them now for those that dont know a diode works like an electric check valve only lets power flow one way . So when I put that newer IAC on my 89 it wasnt allowing it to operate because of the diode that is in it . He told me that if I ran into that again to just take the 2 pins out of the connector and reverse them and it will be fine . So if anyone is swapping parts around and run into this heres the reason . I never did find out what was wrong with mine I was thinking the TPS but never got around to swapping it out and I am now in the process of putting a 5.8 in it because the 5.0 decided to blow chunks . So theres a whole new learning experience with what computer works with what and what you can and connot do with EEC fuel injection . When I put it in though im installing all brand new sensors to make sure I know where im starting from . Hope that helps /emoticons/[email protected] 2x" width="20" height="20" />

 

[lymanl3]

So you never actually got to see if the IAC worked after you switched the connector pins? Even when I replaced the new one it still boggs down..not as bad but still noticable, and it didnt die.

Heres my story ( lol ) My 89 idles very low when the air conditioning pump turns on it will damn near **** it . I cleaned the IAC ( idle air control ) and the throttle body and it helped a little but still not right . I had a 96 5.0 sitting there so I robbed the IAC off it and as soon as it started it would die wouldnt idle a bit so I checked with my buddy that works at ford and he told me that the newer and some of the replacement IAC,s that you get from the part store have a diode in them now for those that dont know a diode works like an electric check valve only lets power flow one way . So when I put that newer IAC on my 89 it wasnt allowing it to operate because of the diode that is in it . He told me that if I ran into that again to just take the 2 pins out of the connector and reverse them and it will be fine . So if anyone is swapping parts around and run into this heres the reason . I never did find out what was wrong with mine I was thinking the TPS but never got around to swapping it out and I am now in the process of putting a 5.8 in it because the 5.0 decided to blow chunks . So theres a whole new learning experience with what computer works with what and what you can and connot do with EEC fuel injection . When I put it in though im installing all brand new sensors to make sure I know where im starting from . Hope that helps  /emoticons/[email protected] 2x" width="20" height="20" />

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[Shadow_D]

I had the same problem and it turned out to be the EGR and a few other sensors.

 

[lymanl3]

Okay, EGR, EGR sensor, TPS sensor....the question is...which one is it..Do I pay to have it put on a computer, then pay labor, cost of parts....or do I just say to **** with it and replace all for $120.....

Lyman

I had the same problem and it turned out to be the EGR and a few other sensors.

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[Daddude]

Maybe thats whats wrong with mine????  I just replaced the idle air control...and cleaned out the throddle body...Mine is stalling when I come to a stop?  Idles fine and runs fine on the highway....could it be the throddle position sensor?Lyman

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The last thing you need to do is to replace the Throttle Position Sensor.I too replaced the IAC and cleaned the throttle body to no avail. A ne w TPS and my Bronco was running like it used to and all for about $50.

 

[Daddude]

i am having a problem with my bronco idling, it starts up fine but when it starts to idle it revs up and down (between 1100 and 400 rpms) and sometimes when it dips down to 400  its dies. i think its a sensor but if it is im not sure which one it is.

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Replace the Throttle Position Sensor and your problem will be solved and all for about $50. at the Auto Zone or Advanced Auto Parts.Good Luck plus you didnt have to pay for a computer diagnostic check at the shop,which would have cost you bigtime!