jeeptec1 Posted August 30, 2021 Share Posted August 30, 2021 Does anyone know if the map sensor also reads barometric pressure on the Renix fuel injection. I know in the Chrysler injection the map sensor reads both. I’m fighting some drivability issues on my 88 Comanche. I was able to borrow a Chrysler drb2 with the Jeep/eagle diagnostic connector. I found my map sensor reads I have 11.7 hg +_ of vacuum when running my mechanical gauge shows 17 hg. The weather app shows barometric pressure for my area is 29.78 the drb shows 28.2. Yes I’ve done the cruiser54 vacuum line and fitting modification on the throttle body. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Ωhm Posted August 30, 2021 Share Posted August 30, 2021 13 hours ago, jeeptec1 said: Does anyone know if the map sensor also reads barometric pressure on the Renix fuel injection Yes. Both at KEY ON and when engine is under a WOT condition. Keep in mind the Manifold Absolute Pressure (MAP) sensor deals with pressures on the absolute scale. Meaning in your example: DRB shows 11.7"hg and your vacuum gauge shows 17"hg. NOTE: vacuum gauge reads on the gauge scale. If you add together both measurements (11.7+17=28.7"hg) thats your BARO reading. Numbers are not corrected for sea-level. Another example is REM/DRB read BARO and MAP, now in order to display ENG_VAC they subtract MAP values from BARO values and then display ENG_VAC. Link to comment Share on other sites More sharing options...
cruiser54 Posted August 31, 2021 Share Posted August 31, 2021 I suspect your MAP sensor is bad. Link to comment Share on other sites More sharing options...
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