Newb question: Funny tach. reading. - Ford Powerstroke Diesel Forum
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Old 05-23-2007, 05:23 AM
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Newb question: Funny tach. reading.

Im new to diesels in general and this morning I was bored so I was playing around on my way to work. My truck was warmed up to normal operating temp when I did this by the way. I was on a straight stretch of road and in second gear. I pulled it up to about 2 grand held it there for a second then pushed it to the floor to see what would happen. When I did this the tach. jump up maybe 100 rpms (moved like a 16th of an inch) then came back down to 2000 and took off. Is this normal for a totally stock 97 PSD, with 3.55 out back?
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Old 05-23-2007, 05:30 AM
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Is it an auto or stick? Sounds like either way it's the TC slipping or the Clutch slipping.
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Old 05-23-2007, 05:33 AM
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Its a stick. It just had a new clutch put in it last summer, and wouldnt it jump up more than 100rpms if it was slipping?
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Old 05-23-2007, 05:37 AM
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It depends on how much it's slipping. It could be just slipping a little bit causing the problem...OR...I could be 100% wrong on the problem. I replaced my clutch in March of 06 and I've slipped it a few times. (Got that tell-tell clutch smell.) You might have over heated it a little causing it to slip. (That's what I did.)
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Old 05-23-2007, 05:57 AM
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Could it be the throttle position sensor. I just remembered for the first 1/3 of the pedal nothing happens then it finally feels like the pedal is doing something.
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