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2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 08-31-2009
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rpm fluctuations while driving

I have a 2002 Ranger Edge 3.0L v6, with an automatic trans., and it has developed a problem of the rpm fluctuating between 2500 rpm, then will jump up to 3000 rpm, then drop back to 2500, then back & so forth. This happens while driving with & without the cruise control on, mostly highway miles, 30 miles 1 way to work. I have had the transmission fluid changed and a new filter put in, and the mechanic said that everything looked good. This problem seemed to arise after I had to replace the camshaft sensor up by the firewall. Any ideas would be greatly appreciated, this seems to be impacting my fuel consumption as well.
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Old 08-31-2009
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The reason the RPM is jumping around is that the transmission is shifting into a lower gear, and then shifting back into the higher gear. The transmission is electronically controlled. Try taking the battery cable off for a night. This will clear the transmission's memory, then when you drive, it will relearn its shift patterns. Might not change anything, but its worth a try.
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Old 08-31-2009
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Thanks Riceman, I will give it a shot.
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Old 09-01-2009
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Also check your trans fluid. Low fluid can cause this as well. I found out the hard way in my work van.
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