PFS PMC PFS PMS ecu, keypad readings....
07-05-04, 02:19 PM
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PFS PMS ecu, keypad readings....
How accurate is the reading from the PFS PMS using keypad?
The reason i'm asking this question is When i look at the MP (boost) it shows at idle like -18,-19. But my autometer gauges show 15 and 16. Which is more correct. I know ECU get's reading from map sensor, and i tapped the gauges in to the UIM on that nipple next to bov hose.
Thanks a lot.
Amel
The reason i'm asking this question is When i look at the MP (boost) it shows at idle like -18,-19. But my autometer gauges show 15 and 16. Which is more correct. I know ECU get's reading from map sensor, and i tapped the gauges in to the UIM on that nipple next to bov hose.
Thanks a lot.
Amel
07-19-04, 04:11 PM
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The Autometer guages are within +\- 1 %. I have a PMS too and it reads the same thing. I was also thinking that my guage was bad and took one out of my other car and it was the same ( had both plumed in together ). I would belive that the computer is wrong.
07-20-04, 11:35 AM
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I got an Autometer that was 2psi off at zero while still in the wrapper. 2psi/60 "units" range (not entirely correct since vacuum is a different unit) = 1/30 = 0.03 = 3%. I still have an HKS that is at least 2psi off.
I have numerious other vac/pressure diagnostic gauges and mechanical stuff all reads a little different for the same input. Maybe Autometer quotes +/- 1% in their specs, but I would tend to believe a solid-state sensors that doesn't get worn out over time. Unless that gauge is calibrated to a proper known good, it's just a rough indicator. Also keep in mind that if you don't have exactly the same boost source there is a possibility that the intake charge has changed temperature and will indicate higher/lower.
I'd go with the map sensor since that's what you are using to control the fuel delivery.
I have numerious other vac/pressure diagnostic gauges and mechanical stuff all reads a little different for the same input. Maybe Autometer quotes +/- 1% in their specs, but I would tend to believe a solid-state sensors that doesn't get worn out over time. Unless that gauge is calibrated to a proper known good, it's just a rough indicator. Also keep in mind that if you don't have exactly the same boost source there is a possibility that the intake charge has changed temperature and will indicate higher/lower.
I'd go with the map sensor since that's what you are using to control the fuel delivery.
