starts, runs, revs, no tach @ low rpms - Ford Powerstroke Diesel Forum
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Old 11-14-2013, 01:45 PM
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starts, runs, revs, no tach @ low rpms

Starts, idles, revs, runs smooth, until you give it more than Quarter throttle, then it will die when you let off throttle. Tach sits on 0 until about 1000 rpms also has slow throttle response. No excess smoke. Sat for at least a year, I think it was running good when parked. pretty sure its fuel problem. New to this forum stuff. hope I did this right. Hope I can find any responses when or if I get any. someone please help the old guy. Thanks
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Old 11-30-2013, 05:31 PM
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Not much info to go on, but you may want to replace your CPS (crankshaft position sensor). Sounds like it could be high resistance/low voltage in the sensor...they don't always just go out all at once, but will often give you warning signs such as you have described. The ECM gets it's signal from the CPS and then sends the signal to the tach.. If the engine cranks, but there's no tach movement...the CPS is a good place to start. Sounds like the sensor is on it's way out. This issue may not present any codes. the last two I dealt with did not show any trouble codes present.
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