Angel Lozano

Recently I got a CEL for misfire in cylinders 1 through 4, and notice a small amount of power loss around 3k rpm.

I checked spark plugs, ignition wires, dist cap seems fine. I went to check my fuel injectors and one was cracked so I replaced it.

However, the car still sputters in 1st gear around 3100rpm and sputters in 2nd gear around 3500 rpm.

After passing those RPMs however, the car will run fine. I have noticed that accelerating slowly but gradually seems to make the problem worse. When I WOT, no problem at all.

Did a compression check, compression was around 180 on all cylinders. Did a fuel pressure test when idling and running, and the pressure seemed fine, until i turned the car off... it went from 35psi to 0 in about 10 minutes. I couldnt find a leak anywhere. Also, when I was trying to run more tests for fuel pressure, Im guessing the gauge stopped working because I had the car on and running fine and the gauge was reading 0psi lol.

I have access to an OBDII scanner, and Ive been getting a positive Short Term Fuel Trim correction of about 46.9! Long term fuel trim is at -0.8. Huge difference. Also before this CEL I had a CEL for lean condition, but after replacing my fuel filter it went away.

Im guessing its the fuel pump causing the misfires. A friend of mine believes its something related to the inside of the distributor. Any help is appreciated.

wunfstgsr

Try and reset the ecu either unplug the ecu from the harness for a few mins or pull the ecu fuse from the engine bay fuse box. or scan it with a obd scanner and clear the code. Are you sure the rest of the injectors are still good? i dont think its your fuel pump.