2.9L Runs rough, but only intermittently - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 05-19-2005
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2.9L Runs rough, but only intermittently

Hello Ranger experts,

I have a 1986 Ranger, 2.9L, that starts up like a champion every time. And about 80% of the time it will idle OK, for an engine with 220,000 miles on it. But the thing runs very rough on the road at times, and by this I mean very randomly, and just as randomly it seems to come out of it and run ok. I have noticed some correlation with this happening in conjunction with acceleration, but nothing that I can state in absolute terms. The rough running seems to be to be almost like it is starved for fuel. I can't pin it down and don't know where to start - I have changed the fuel filter and the fuel pressure regulator. No improvement. Any ideas?
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Old 05-19-2005
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i would guess its the TPS (throttle position sensor) thats the culprit... i had a similar problem on my 86 bronco II and that was it
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Old 05-19-2005
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Same

I would say TPS also
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Old 05-19-2005
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I'm just gonna say welcome to the site. Those guys seem to have you covered with a place to start.
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Old 05-23-2005
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tried the TPS - no dice. A code reader gave me a 25

So, a 25 means Knock Sensor. I have a knock sensor in hand, cannot find the knock sensor on the engine. 2.9L V6 - anyone have a clue where it might be? Does not show up in my repair books.

thanks for your help in advance...
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