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My 1996 geo tracker started missing and suddenly quit and wont run. I had a new fuel pump put on year before last and new plugs and wires and a distributor cap put on last year. What could the problem be?
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Do a compression test of the engine. See if your valves are seating properly is what you'd be looking for in checking for low compression. It could be causing the miss. When you changed plugs, did any one plug stand out as being different in color or texture at its base? The constant miss might put black sooty deposits on the spark plug. Course you'd have to remember which cylinder that plug came from to help you locate the miss. I'm assuming you have throttle body injection?
Old post. but this is common on ALL EFI CARS. great question and is very easy. btw one of the best posts on the forum best of 1300. the gas cap must have the proper vacuum breaker (ask STANT for one) if missing the cooling fuel will pull and illegal vacuuum and the gas tank will implode (crush) I have a nice photo of same car doing that. this vacuum also stalls the fuel pump, as the vacuum builds. this happens on cooling day not getting hotter day. to prove this drive with the cap loose and ignore the ECU check light for EVAP failure. (pressure test fails) loosen the cap key on, 3 times to 5 times to build pump pressure, the pump only runs key on for 3 sec. then start it up. the other proof of lost fuel is the test fuel test. (spray)
Have you checked the fuel regulator and the pressure from the fuel pump to ensure it is not weak. In addition, you might want to check and see if fuel is going into the cyl. the catalytic converter may be plugged based on the year of the car. To check this you could pull the o2 sensor out of the exhaust and see if it keeps running, realize it won't run at 100%. If it is the back pressure will not allow fuel to come into the cyl.
I had this problem as well. The tracker had sat for 8 years and would only run off of starter fluid. I replaced the filter and fuel pump then I had no fire. Located under driver side dash in the fuse panel theres a fuse for coil. I don't remember which one, but, I am pretty sure it is a 10 amp fuse. Or just do like I did and replace any bad fuses. If that doesn't work it will be a relay located above that same fuse box.
The ECM has a blown capacitor inside it for opening the injector you will most likly need to get it rebuilt, buy a new ,or used ECM had the same problem with my sidekick.
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