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I just installed a new oil pressure switch on my 1990 2.5. Every time the engine is started it reads different. could it be air bound?

Does any one know what the orifice hole size is in the CCV fitting that is installed in the 1993 valve cover I have replaced my 1990 2.5 crappy plastic valve cover with an Aluminum 1993 valve cover and it works fantastic. The 1990 PVC says its opening is 2.2mm. I am wondering, is the fixed...

1990 YJ 2.5l, my manual says starting input voltage is 5 volts. Mine is 5.13 volts. Out put is suppose to be 4.7 volts. Is 5.23 volts ok. I have changed 3 sensors and still have hesitation at different RPMs with each different sensor?

Has any one found when changing the timing gear sprockets, that the cam sprocket dowel pin is in the wrong hole in the cam making the timing mark on the sprocket 180 off. There are two holes in the end of the cam. I think someone during engine assemble back in 1990 was setting up a head scratcher.

What is the best way to adjust the fuel pressure regulator on a 2.5 TBI system?

I have a 1990 YJ with 2.5 and TBI. IT has been rebuilt 2 years ago and has been my daily driver. Lately it has developed hard to start. I have changed fuel pump. fuel pump relays, fuel filter is new. coil and ignition module. and all engine sensors at rebuild. I have checked all grounds and...