Having major issues with engine performance! Just traded for the YJ and the PO rebuilt the engine his self, could not get it to run right and gave up.
So I've checked the timing, TDC #1 valves closed on #1 etc. Engine will run but misses and from the look of the plugs its running rich. Been reading lots of threads but not finding anything that has helped. This is my first 4 cyl Jeep and not real up to speed on them, but i have found that this engine configuration was used only in 87 and 88 year models. As it is a TBI system I'm ready to jerk the TB and electronic ingition and go old school, but I've yet to find any write ups on this mod.
I'm sure someone has done this before. I have a Motorcraft version of the webber carb i could rebuild and use, if it will work on the 2.5l, provided i can get someone to point me in the direction of which dizzy to use.
I've read about the brain surgery thing and from what I've read i don't think it applies to the setup in my YJ.
The TBI is almost too simple to work on and get to running perfect. You need to start out with a good understanding of it and then check simple things like , compression, weather the timing is set correctly, if there is enough fuel pressure.
Again its TOOOOOOOO simple.
Timing on the 2.5 is set by ecu at 8 degrees BTC. If it is running rich it could be several things. Tstat 195 should have operating temp at 210. O2 sensor , temp sensor for air and water on intake. TPS on throttle body, map sensor on firewall. Leaking vacuum lines. All players because they talk to ecu which decides fuel air mixture and timing.
Fortunately my PO did nothing but drive it. No butchered wires no mechanical who ha at all and n o real rust as those from back east show us. So mine was really easy to work on. If you need anything post it up we have the answers I chased all mine trying to pass a NV smog so I got really good at all that crap that talks to the computer to fix the timing and mixture. Found all my answers here in mutiple threads.
I only wish it was turbine powered. Then I could combine two of my hobbies off roading and flying. I haven't worked on a gasoline injection system in years, been working on diesel injection systems for the last 10-15 yrs and I gotta get myself back in that swing. I was working as a Chrysler mechanic before I got out of high school. Then about 5 yrs outta HS I started working on heavy equip. And now I must retrain to work on little stuff again.
This morning i found the O2 sensor unplugged and still no luck finding the temp sensor.no place to just connect the fuel pressure guage so i'll have to install a tee to get fuel pressure.
On the other hand I have no fire this morning???
I have power to the igniter and I cleaned the connections and grounds and still no fire. to make things worse no one in town has either piece! Is there an aftermarket that will work in place of OEM ignition?
Ok maybe i've been away from the fuel injected gassers for to long, but then again this jeep dates back before i started working in the car dealerships.
There's no wires coming out of the dizzy? In the chiltons manual I find where the engine should have a sensor on a trigger wheel mounted to the flywheel. guess i try and find a crank sensor first, it will likely be less expensive than the coil and igniter.