Having the oil pressure gauge problem that seems to be common to our TJ's. The gauge goes to 0 at certain times at idle, then back to "normal" when RPM's are added. I had this issue about a year ago and fixed it (so I thought) by cleaning the two connectors on the back of the Instrument Cluster. I have cleaned the connectors again but the problem still exists. I have let the motor idle for 45 min while indicating 0 PSI with no engine noises so I assume that I have pressure at idle (will put my manual gauge on it this weekend to confirm). I know the PCM the Instrument Custer "gauge" is really an idiot light that is either at 0 or a little past the middle when the oil pressure is 6PSI or more.
While messing with it last night for a bit I found that if the gauge is indicating pressure while the engine is idling, if I disconnect the connector from the Oil Pressure Sending Unit the gauge will still indicate pressure for as long as the Jeep idles. When I turn off the engine and remove the key wait 5 min and start it back up (connector still disconnected) the gauge will then indicate 0PSI and the check Gauges Light indicates, if I plug the connector back in while running the gauge will still show 0PSI until I turn off the Jeep remove the key and start it back up.
Has anybody has this happen? According to the manual there is a time delay between when the sensor changes and the gauge displays but that is 12 seconds, I let it run disconnected for 30min and the gauge always showed pressure until I turn off the Jeep and turned it back on. It seems that the PCM is getting a signal that there is oil pressure when the sensor is unplugged until it is power cycled (and vise-versa).
I have ordered a Mopar sensor (P/N 5149097AA) but not so sure this will fix the issue.
While messing with it last night for a bit I found that if the gauge is indicating pressure while the engine is idling, if I disconnect the connector from the Oil Pressure Sending Unit the gauge will still indicate pressure for as long as the Jeep idles. When I turn off the engine and remove the key wait 5 min and start it back up (connector still disconnected) the gauge will then indicate 0PSI and the check Gauges Light indicates, if I plug the connector back in while running the gauge will still show 0PSI until I turn off the Jeep remove the key and start it back up.
Has anybody has this happen? According to the manual there is a time delay between when the sensor changes and the gauge displays but that is 12 seconds, I let it run disconnected for 30min and the gauge always showed pressure until I turn off the Jeep and turned it back on. It seems that the PCM is getting a signal that there is oil pressure when the sensor is unplugged until it is power cycled (and vise-versa).
I have ordered a Mopar sensor (P/N 5149097AA) but not so sure this will fix the issue.