2000 Ford F 350 Engine 245000 Miles Driving Low Speed Hwy Tach Jumps

2000 FORD F-350
245,000 MILES
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MYANKOVI
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2000 Ford F-350 Engine Problem with 245000 miles
Driving at low speed or hwy speed tach jumps up or down approx + - 200 rpm engine runs fine does this intermittently
Engine 7.3 diesel. Just changed Altenator with a new one.Tryed Cam position senser no change.
Jan 20, 2013 at 11:29 AM
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ASEMASTER6371
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does it feel like the trans is downshifting??? or is it just the motor??

Roy
Jan 20, 2013 at 11:39 AM
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MYANKOVI
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Stick shift. Engine RPM does not feel like its changing RPM truck speed (MPH) does not change there is no surging. looks like indication only.
Jan 20, 2013 at 12:51 PM
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ASEMASTER6371
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the tach may be intermittently having an issue. clean all connections otherwise, it may need a tach

Roy
Jan 20, 2013 at 12:53 PM
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MYANKOVI
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Were does the tach pickup its input from.
Jan 20, 2013 at 12:55 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
the pcm which gets it from the crank sensor

Roy
Jan 20, 2013 at 12:58 PM
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