Ok, So I've been searching for the last hour, I just have a few simple questions.
1. What's everybody's idle speed? My idle does not hunt, but it seems very low. My 4.0 likes to idle at about 3-400 RPM. I've adjusted the TPS, cleaned the IAC and TB. It had a full tune up when I bought it a month ago, plugs, wires, dist, rotor, fuel and air filter.
2. Where does the tach get it's input signal? This relates to the first question. I'm not sure if it's showing a true number because I don't know how it works.
3. In my searching I've come across the EGR causing many troubles relating to low idel speed. How do I disable the EGR in my 87. Just pull and plug the Vac line on apparatus on the drivers side fender?
4. What's normal oil pressure for an older 4.0? I'm running regular 10w40 in this engine. Cold start is a shae above 60, cold idle is about 40. Warm cruising speed @ ~2K RPM is right at 40. Warm idle is right around 20. The oil pressure is very throttle responsive. A blip of the throttle send the guage skyrocketing. I imagine that getting my engine to the proper idle will get the oil pressure to 30 PSI, as soon as I ind out what the idle speed should be.
Ok, specs:
1987 MJ, 4.0, AX-15
Odo says 242K miles, but it's not the original tranny, and the engine block is orange, so it's probably not original. No lifter ticking, minimal valve train noise.
Sorry for the book, I'm just a paranoid newbie 4.0 owner.
1. What's everybody's idle speed? My idle does not hunt, but it seems very low. My 4.0 likes to idle at about 3-400 RPM. I've adjusted the TPS, cleaned the IAC and TB. It had a full tune up when I bought it a month ago, plugs, wires, dist, rotor, fuel and air filter.
2. Where does the tach get it's input signal? This relates to the first question. I'm not sure if it's showing a true number because I don't know how it works.
3. In my searching I've come across the EGR causing many troubles relating to low idel speed. How do I disable the EGR in my 87. Just pull and plug the Vac line on apparatus on the drivers side fender?
4. What's normal oil pressure for an older 4.0? I'm running regular 10w40 in this engine. Cold start is a shae above 60, cold idle is about 40. Warm cruising speed @ ~2K RPM is right at 40. Warm idle is right around 20. The oil pressure is very throttle responsive. A blip of the throttle send the guage skyrocketing. I imagine that getting my engine to the proper idle will get the oil pressure to 30 PSI, as soon as I ind out what the idle speed should be.
Ok, specs:
1987 MJ, 4.0, AX-15
Odo says 242K miles, but it's not the original tranny, and the engine block is orange, so it's probably not original. No lifter ticking, minimal valve train noise.
Sorry for the book, I'm just a paranoid newbie 4.0 owner.