1996 sport rpm gauge is off about 200-300 rpms
1996 cherokee sport.. rpm gauge is low.. sometimes way to low.. around 1500 rpms when it should be around 2000.. i notice it while accelerating.. at idle it always reads around 750.. my 1992 laredo did the same thing before i sold it.. from what i understand the rpm readings come from the pcm.. how can i fix this ?
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no i didn't hook up another tach to it. sometimes it reads normal, acceleration patterns and shift patterns are the same.. then it will all of a sudden read 1500 rpms while im accelerating instead off the usual 2000 rpms. its kinda hard to explain.. but i know the rpm gauge is off.. when im accelerating i ushally am around 2000-2200 rpms.. when the rpm gauge is acting up its around 1500rpms, with the same amount of throttle. sorry for any confusion, im trying to explain it best i can..
I have a 99, the tach seems to be a combination of the Crankshaft Position and Cam Shaft Position sensor inputs. It seems they go to a counter circuit in the PCM and the resulting digital output is sent to the tach. It is similar on my 95 Wrangler. However the gauge is different. There is uprocessor in the gauge that counts the pulses and then adjusts an electromagnet in the gauge to give the proper reading. As you don't mention other issues, I would venture the tach gauge is the culprit. Again that is for a 95, I don't know about the '96.
Let us know,
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