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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?

Thanks Dorf, that's what I was looking for.

I do have a complete set of the 1990 FSM's. I noticed reading the FSM that the 1990 PVC valve had an opening of 2.2mm. So I started to think that I now have the aluminum VC with the orifice CCV that maybe its not big enough in Dia.?

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...

If your interested I checked the vacuum. At 800 RPM 19 Inches 1800 RPM 20 inches Needle steady

Now my up shift light is not working??? I checked the bulb and is good. with key on no voltage to light. There is a switch some place but I can not find it? It's not on the right side of may A5 transmission that is posted on Youtube, the switch that is there is my back up light switch.

Well: I changed the starter switch with STD US95 from O'Reilly. The old switch was toast, all terminals were a nice shade of green. Changing this switch was not easy for me! Some of my body parts don't work or bend like they use to. I had to remove much more to gain access for me. Now that I...

The Alt. is a AC Delco (Rebuilt) purchased thru Rock Auto. Alt. voltage at Idle (800 RPM) is 14.2 higher RPM it goes up to 14.7 V. The stumble is actually like misfire, like a switch was thrown? Right foot is steady and it does it at around 1400RPM and sometimes higher at 2300 RPM,s I have...

We'll, I noticed something interesting today! While driving the YJ and the hesitation was happing as normal, I noticed the Amp meter was dipping in conjunction with the tachometer dipping! After all this pain chasing this gremlin could it be as simple as the Key switch. There seems to be a...

I investigated the possibility of switching to 1991 MPI system. It 's a hell of a lot of work. Maybe if I ever have to do a complete engine overhaul someday. If I would use a 91 MPI the head from the 90 will work. Starting in 92 you need a different head also.

Hi Dorf, the 1990 YJ doesn't have CE light. I think I now I can move on from the TPS and the idle speed actuator (ISA). When I started working on this project 2 years ago, I did a major tune up on the engine because it sat in a car port for 7 years. I bought it from the original owner. Changing...

Hesitation is steady right foot at about 1,400 RPM in 3rd gear. this the best it has been.

Dorf: where can I purchase the OEM FSM? I'm very confident the ISA is set up correctly. It does what the manual says it to do. I can reach 4,000RPM in 1,2,3, gears easily. Attached are photo's of the TB. Also not I got rid of that crappy plastic valve cover. Thats a 1994 aluminum I picked up at...

AT WOT I'm at 4.71 volts

Dorf: a couple of things come into play. 1. Throttle body has been rebuilt with new regulator and pressure set to 14 psi. 2 I have been going to Battery ground instead of terminal B??? 3 This throttle body has an ISA which does not let me put the throttle on the ideal stop. 4. We don't have...

HI Doef, Thanks for all of this information. Unfortunately This is a 1990 YJ with a 2.5L with a single fuel injector mounted in the throttle body. This YJ only has 118,000 miles on it. Being 33 years old I immediately did a major tune up on the engine and replaced all sensors, ignition system...

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?

I have rebuilt my TB. Fuel pressure is now 15.5 PSI @ 2000 RPM. It’s 1 lb more than spec. Is this going to be a problem? I hate the thought of removing the the TB again to get at the adjusting screw on the regulator

Well that makes me feel better, that someone else ran in to this . I thought the cam as there are two Dowl pin holes in the cam. If the other pin hole was to be used the timing marks would’ve lined up. I tried to change the the pin but couldn’t remove it.

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.