I have a 1993 Jeep Grand Cherokee Laredo that was running well, but I stopped at a restaurant for lunch, and when I came out and restarted the car, it ran like garbage. I babied it 50 miles home, where I replaced the spark plug wires, cap and rotor. (I figured it hadn’t been done since I bought the car, and wouldn’t hurt, might help) No change. unplugging the injectors on cylinders 4,5,6 makes no change. Fuel pressure is a little weird, as it reads between 20-37 lbs, but whatever the pressure is reading, it runs poorly. The fuel pressure leaks down almost immediately after shutting off the truck.
- Why do my 4-5-6 injectors appear not to work?
- Could the apparently bad check valve in my fuel pump cause my symptoms?
- Is an inline check valve an option to repair this? (money is an issue.)
The sudden nature of the malady suggests to me that it is not plugged injectors, though I am open to suggestions.