Idle Surge
Elder User
Joined: Oct 2002
Posts: 573
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From: Medina, Tn.
If you do a search, you will finds numerous links about this. For one, the throttle position sensor could be bad or out of adjustment. Take your throttle body off and clean it with throttle body cleare and replace the gasket as well. There are just so many things that can screw up an idle. My fuel pressure regulator caused this for a year before I figured it out. Fuel filter to a certain degree can do it also as can gasket leak around the tb.
Good luck,
Good luck,
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Joined: Dec 2003
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From: Los Angeles
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Well, I replaced the AIC, the TPS, cleaned the throtle body....and it still surges!
After disconecting the batery to install the tps, the surge went away for a day or two, but now it is back. I suspect the computer was reset when the batery was disconected????
Also, the idle goes up when I put it in gear and stays high until I step on the brake and come to a complete stop, then it drops down.
This is driving me nuts! Help!
After disconecting the batery to install the tps, the surge went away for a day or two, but now it is back. I suspect the computer was reset when the batery was disconected????
Also, the idle goes up when I put it in gear and stays high until I step on the brake and come to a complete stop, then it drops down.
This is driving me nuts! Help!
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Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
May have a bad ECT. Engine Coolant Temperature sensor. The PCM takes info about engine temp from this sensor for idle control settings. Its mounted in the lower intake manifold just behind the water neck for the thermostat. But it should have triggered a "check engine" light and code in the computer.
Senior User
Joined: Feb 2004
Posts: 180
Likes: 0
From: Newport News, VA
I'm in the same boat with ya Ed!! My Bronco is doing the same thing (and has for the 5 years I've had it!) and I've replace the IAC, TPS, dist cap and rotor, plugs, wires, fuel filter and fuel regulator. Hadn't heard about the ECT though....will try that this weekend. I've read on other forums that this is a problem for alot of Fords'....cars, trucks, 6 and 8 cyl...around the mid-late 80's. A friend's Dad's 89 F150 6cyl does the same as my 87 302!!
My daughter wants to put pixy dust on it!! Might have to try that!!
My daughter wants to put pixy dust on it!! Might have to try that!!
Senior User
Joined: Mar 2004
Posts: 155
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I remember my first Bronco had the same problem. This was due to a bad Thermostat. I guess it had to deal with the temp. of the engine.
Now my second Bronco has the problem and the Check Engine light comes on and off. I will look into the AIC later and then go down the list.
Thank you guys!
-Stranger
Now my second Bronco has the problem and the Check Engine light comes on and off. I will look into the AIC later and then go down the list.
Thank you guys!
-Stranger
New User
Joined: Feb 2004
Posts: 16
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Originally Posted by Ed_B1
Well, I replaced the AIC, the TPS, cleaned the throtle body....and it still surges!
After disconecting the batery to install the tps, the surge went away for a day or two, but now it is back. I suspect the computer was reset when the batery was disconected????
Also, the idle goes up when I put it in gear and stays high until I step on the brake and come to a complete stop, then it drops down.
This is driving me nuts! Help!
After disconecting the batery to install the tps, the surge went away for a day or two, but now it is back. I suspect the computer was reset when the batery was disconected????
Also, the idle goes up when I put it in gear and stays high until I step on the brake and come to a complete stop, then it drops down.
This is driving me nuts! Help!