1999 ECM Question

dapepper9 said:

If he's talking the gauges it won't do anything. If he's talking about disconnecting battery and and draining residual charge in the system then thst does help when replacing sensors. Kind of like a reboot on your home pc when installing new software.

I would find a 99 PCM for a 5.9, 5.2s have different fuel and timing demands regardless of what anybody trys to tell you. They'll run each other but not great. 98 also had a few weird changes going on so that's my reasoning for sticking to 99 specifically

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jlbayes said:

An apps relearn is to learn the min and max movement of the apps by the pcm/ecm. Why I am curious as to what it effects on a 3 wire tps. Had these trucks (gas) had an apps I could understand.

Ehh, wrong acronym, not an apps, per say. But i've had three TPS in my truck, the original, a cheap one and finally one from the dealer. It's not going to have the same effect as on the diesels which will throw codes at you if its bad enough. But clearing the memory on the PCM then relearning the range from a 3 wire can help solve some minor issues. When I first replaced mine it had a range of about 35%-80% aprox on the cheap one, it would have some strange issues if you barely hit the gas at low speeds. After disconnecting the battery then connecting it, turning the key to run and slowly pushing the pedal from rest to the floor it change the percentages to aprox 20%-80%. After that failed in about two months I put the mopar one in, which read slightly different and now reads 17%-78%.

I may be wrong about how the PCM reads the TPS, but 'resetting' the thing after changing the TPS seems to have fixed some small strange issues.

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