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Engine won't idle

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Old Nov 15, 2005 | 08:14 AM
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Unhappy Engine won't idle

My F150 recently started running rough, and now won't idle. The gas mileage is terrible! Someone said it was idle sensor, and to unhook battery to reset computer. That didn't help? The engine light stays on too. Will I have to have
someone hook computer up to it? Thanks.
 
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Old Nov 15, 2005 | 09:51 AM
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What model year and engine cid? My sons 92 302 was doing the same thing and we had to replace a sensor on the drivers side of the throttle body; sorry, I can't remember what the sensor was called now. You can disconnec the electrical plug on the sensor to see if you get an RPM increase. Autozone was also able to test it for us.
 
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Old Nov 15, 2005 | 09:55 AM
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From: Easton,Ks
Originally Posted by MICBAR
My F150 recently started running rough, and now won't idle. The gas mileage is terrible! Someone said it was idle sensor, and to unhook battery to reset computer. That didn't help? The engine light stays on too. Will I have to have
someone hook computer up to it? Thanks.
Take it to autozone and have them read the codes, do not buy anything, come back here and post the codes and we will try to help you.
 
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Old Nov 15, 2005 | 10:06 AM
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It is a 91 302. So if I disconnect the plug on driver side and RPM increases...it is bad? Thanks Bronco
 
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Old Nov 15, 2005 | 10:22 AM
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From: Easton,Ks
Originally Posted by Bronco308
What model year and engine cid? My sons 92 302 was doing the same thing and we had to replace a sensor on the drivers side of the throttle body; sorry, I can't remember what the sensor was called now. You can disconnec the electrical plug on the sensor to see if you get an RPM increase. Autozone was also able to test it for us.
That item on the drivers side of the throttle body is not a sensor, it's the Idle Air Control (IAC) Solenoid. There is a sensor on the bottom of the throttle body called the Throttle Position (TP) Sensor. It can cause this problem also.


 
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Old Nov 15, 2005 | 10:25 AM
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Thanks for the help subford!!
 
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Old Nov 15, 2005 | 10:29 AM
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MICBAR, if you unplug the connector and the idle drops then it's working. It's probably just stuck and dirty.
 
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Old Nov 15, 2005 | 10:59 AM
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So the Throttle Position (TP) Sensor is located at the bottom? Any idea what color the wires at the connector are?
 
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Old Nov 15, 2005 | 11:38 AM
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From: Easton,Ks
The connector I think they are talking about is the one on the IAC not the TPS.

Here is some photos of both.



 
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Old Nov 15, 2005 | 11:41 AM
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You are a good man subford!! Thanks
 
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Old Nov 15, 2005 | 11:55 AM
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From: Iowa Park, TX
Smile

Thanks for clearing up my phraseology! I was told that if you ever have to remove/replace the TPS, to make a mark on it and the throttle body to help with calibration.
 
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Old Nov 15, 2005 | 11:59 AM
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Hey guys. I had a cougar with the 3.8 v6 that had the same type problem and it ended up being a large vaccum line on the underside of the upper intake manifold had come loose. Just something to think about. Tim
 
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Old Nov 15, 2005 | 12:49 PM
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I have photo...how do I get it on here?
 
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Old Nov 15, 2005 | 01:35 PM
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Angry Codes

I went to autozone today, they couldn't read the codes at this time.
 
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Old Nov 15, 2005 | 04:20 PM
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From: Easton,Ks
Originally Posted by MICBAR
I have photo...how do I get it on here?
1. Go up near the top and piont to Galleries, then click on Manage/Create.
2. Click on Create Album
3. Give the information it wants.
4. Click on Create Album at the bottom
5. When it comes up click on edit to the left of the name you gave it.
6. Go down and click on Browse..
7. Choose a file in your computer.
8. Click Open.
9. Click Upload.
10. When its done go down and click on [Forum Codes]
11. Highlight the information in the box.
12. Do a "Ctrl" "C"
13. In your post where you want it just do a "Ctrl" "V".
and that’s it.
 
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