97, 4.0 Ranger engine jerks "little" idling - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 07-10-2013
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Location: Waterford MI
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97, 4.0 Ranger engine jerks "little" idling

Hello, I have a 1997 Ford Ranger 4.0 2WD.

I'm not sure if this is normal but when my truck is idling at a stop light or just in the drive way the engine jerks a little bit like it is misfiring. I have replaced all plugs/wires and I also have cleaned the MAF, and TB. Before it used to misfire and throw some codes until I changed the plugs/wires. Now I believe it's still doing it but not as bad and not enough to throw any codes.

Also before when I would tap on the gas my truck would die and I would have to restart it. It hasn't happened in awhile which I think the problem was the MAF being dirty? What else would cause the engine to possibly misfire or cause jerk-ness?

Thanks.
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Old 07-14-2013
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No help? sniff sniff =/
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Old 07-14-2013
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I'll guess that your idle control valve is malfunctioning. When the symptoms occur, try tapping the valve sharply with the handle of a screwdriver (or something) and see what happens.
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Old 07-19-2013
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I had a similar problem with rough idle, and it was a vacuum leak. It was difficult to find at first, but as the leak became worse, the controller displayed a code 174. It was a vacuum hose rubbing on the rad hose. Don't know if this is your problem, but who knows.

MM
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