2.3L & 2.5L I4 Tech General discussion of 2.3L and 2.5L I4 Ford Ranger engines.

01' 2.3L OIL GAUGE FLUTTER AFTER HIGH RPMS

  #1  
Old 02-06-2019
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Icon5 01' 2.3L OIL GAUGE FLUTTER AFTER HIGH RPMS

2001 Ford Ranger XL 2.3l MT

I recently battled the P0171 code, before i could clear the code I noticed the gauge twitching and rough idle after high rpms on the highway after truck is warm. After replacing faulty vacuum lines, PCV Valve and cleaning the MAF Sensor the rough idle went away bet the fluttering gauge remained. Then I replaced the Oil Pressure sensor, the one next to the filter, and replaced the fuel pump gasket. The fluttering went away and the idle couldn't have been smoother. Then the weather got warm and after high rpms the fluttering returned but the idle is still smooth.

So, Im thinking its the O2 sensor or the Cam Sync, but im leaning toward O2 sensor because of the smooth idle and change in temp.

Help me out and et me know what you think and if you've had experience with this.

thanks!
 
  #2  
Old 02-06-2019
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Oil Pressure Sender is just an ON/OFF switch, above 5psi oil pressure the switch is Grounded(closed), below 5psi switch is unGrounded(open)

So any movement of oil pressure gauge needle is an electrical issue, nothing to do with actual oil pressure in the engine

Oil pressure sender should just have 1 wire connected, my diagram shows a dark green/white stripe wire in 2001
The threads on the Sender are the Ground for the circuit, so you need to leave lower threads bare metal so they get a good ground to the engine block

You could pull off the connector and Ground this wire, then go for a drive to see if the flutter is gone, if its still there then the problem is the wire or instrument cluster
If flutter is gone then sender or its ground in the block is the problem, new or not

You could try a voltage meter in cigarette lighter plug to see if maybe the alternator is fluttering voltage now and then
Cigarette lighter plug is direct from battery so nothing but a fuse in between, unlike voltage gauge on the dash
 
  #3  
Old 02-06-2019
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Would this explain the change i noticed after the weather warmed up?
 
  #4  
Old 02-06-2019
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Originally Posted by Facemaze View Post
Would this explain the change i noticed after the weather warmed up?
Sure why not, poor electrical connections change resistance with inside or outside temps

Since you know the actual oil pressure can't be seen to "flutter" using an ON/OFF electrical switch, then issue has to be electrical
 
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