Question about Cars & Trucks
I suspect that there is nothing wrong with the speedometer but what you are looking at is a tachometer (engine RPM counter). Oscilations in engine RPM's is normal and generally points to a tuning problem of the engine. It may be from incorrect chain tension as this would change valve timing as the chain flaps around and cause a change in ignition timing as well. IF it concerns you the readjust the chain tension to the correct setting.
Posted on Dec 25, 2013
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Posted on Jan 02, 2017
It could be a spark plug, plug wire, or a coil. Sometimes thay break down intermittently. If it needs a tuneup, that would be the first thing to do.
Posted on Jun 20, 2009
SOURCE: 1999 Chrysler Concorde LXI 3.2
This sounds as if the input and output speed sensors may be having an issue. If you are putting a used tcm in it will have been powered down and basically reset to it's defaults.Would completely disconnect the battery and hold the cable ends together this will force a hard reset of the tcm and ecm which will return all adaptives to the factory presets.When started it may run very poorly for a few minutes until it relearns. You then should be able to drive it and it will continue it's adaptive learning curve.
Posted on Dec 01, 2010
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