HELP: Hopping/ knocking under acceleration - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 05-23-2009
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HELP: Hopping/ knocking under acceleration

I have a problem. It started yesterday and now its getting worse. I accelerated on the highway doing around 60mph. All of a sudden I had some sort of hopping feeling from the rear end. Not sure exactly how to explain it. It kind of felt like the tires were bouncing or something. It had the feeling of being pushed a little really quickly, or something smacking under the truck or something. And it continued until i let off the gas. Now its doing it at lesser speed and more often. Almost every time the truck is under any sort of load such as accelerating on any type of hill. This is under a normal amount of acceleration, just getting up to speed.

I'm not exactly sure how to explain it, but I tried to explain it to my friend the other day. He told me to check my U-joints for any play or movement. There was no play when I checked it on the truck. Should I take it off? I'm not sure what to look for after that anyway. Any help would be great, I want to fix this before it breaks something else.
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Old 05-23-2009
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Anyone?
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Old 05-23-2009
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mine was the K&N filter causing spikes in the MAF sensor
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Old 05-23-2009
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This didn't seem like the engine to me. But how would I check for that. Did you get a trouble light or anything from that?
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Old 05-23-2009
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No there was a thread about it and it was the same problem and description so I changed the K&N out and put a FoMoCo one in and cleaned the MAF and no problem since.
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Old 05-23-2009
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I just put in a motomaster air filter. All there stuff is stock type. What do I use to clean the MAF?
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Old 05-23-2009
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MAF cleaner from CRC, a tooth brush and a clean rag
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Old 05-23-2009
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Think it might have been misfires. I changed the spark plug wires and I haven't had the problem yet. I accelerated hard a few times and it ran fine.
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