95 Dak 3.9l clean but low idle 500rpm
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95 Dak 3.9l clean but low idle 500rpm
I fixed all my vacuum issues, replaced egr, changed the TSS, cleaned the throttle body, replaced IAC, I've got a new fuel pump, and I have a new rotor and distributor set. I had a NAPA mechanic tell me that the RPM is computer controlled on this model. He said if its running clean I'm chasing geese trying to raise the RPM. I was told it should run 7-1000, but it is running smooth at 4-700. I mean I'm probably getting better mileage, but something doesn't seem right. Any thoughts?
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I know, I can barely trust this dash. Since I replaced the TSS, the RPM gauge seems to be reading well though. Is there a free way I can get an exact RPM reading?
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However, the frequency/current or voltage conversion is done by a board on the instrument cluster, and THAT can vary out of spec.
To get an exact RPM, borrow a real service tachometer. Do be aware that some tachs will have problems with a stable reading off the coil, though
You can cheat with a timing light; count how many flashes in 10 seconds, and multiply by 2, then the number of cylinders, and that's your idle speed in RPM.
RwP