Natedizzle
Probationary Member
- 4
- 0
- May 26, 2022
-
Stuart,
Florida
Hey everyone,
I'm new to this 420a motor so not entirely sure what's going on with it. I have a weird misfire issue, when idling and under heavy acceleration it misfires and sputters. When accelerating slowly the misfires seem to go away.
Codes Reciving:
P1390 - Timming skipped one or more teeth (Tripple checked timing all good)
P0171 - lean bank 1 (Replaced both o2 sensors)
P0300 - multiple cylinder misfire
P0302 - Misfire cylinder #2
P0304 - Misfire cylinder #4
For these misfire codes:
-Pulled plug wires individually and rpms dropped except cylinder 4.
-Pulled injector harness connectors rpms dropped but barely on cylinder 4.
-Put screw driver on injectors to hear for pulses all seemed the same across.
-Volt reading at injector harness 13.5v across all 4 injectors.
- Ohm readings across all 4 injectors identical.
- Checked for vacuum leaks but didn't find anything.
Parts Replaced since November 2021:
Ecm
Iac valve
Tps
Cam sensor
Crank sensor
Map sensor
O2 sensors (upstream and downstream)
Fuel pump
Fuel filter
Egr delete
No AC
No PS
Next thing is to check compression. Gonna rent a storage soon if need be to tear this thing apart. As you here that knocking in the video but just not sure cause it goes away when I accelerate.
My other guess is maybe burnt valves causing improper combustion. Idk.
Not sure what's really going on since I got the car like this. The previous owner is no help as he as well purchased the vehicle with these issues with hopes of fixing it.
I'm new to this 420a motor so not entirely sure what's going on with it. I have a weird misfire issue, when idling and under heavy acceleration it misfires and sputters. When accelerating slowly the misfires seem to go away.
Codes Reciving:
P1390 - Timming skipped one or more teeth (Tripple checked timing all good)
P0171 - lean bank 1 (Replaced both o2 sensors)
P0300 - multiple cylinder misfire
P0302 - Misfire cylinder #2
P0304 - Misfire cylinder #4
For these misfire codes:
-Pulled plug wires individually and rpms dropped except cylinder 4.
-Pulled injector harness connectors rpms dropped but barely on cylinder 4.
-Put screw driver on injectors to hear for pulses all seemed the same across.
-Volt reading at injector harness 13.5v across all 4 injectors.
- Ohm readings across all 4 injectors identical.
- Checked for vacuum leaks but didn't find anything.
Parts Replaced since November 2021:
Ecm
Iac valve
Tps
Cam sensor
Crank sensor
Map sensor
O2 sensors (upstream and downstream)
Fuel pump
Fuel filter
Egr delete
No AC
No PS
Next thing is to check compression. Gonna rent a storage soon if need be to tear this thing apart. As you here that knocking in the video but just not sure cause it goes away when I accelerate.
My other guess is maybe burnt valves causing improper combustion. Idk.
Not sure what's really going on since I got the car like this. The previous owner is no help as he as well purchased the vehicle with these issues with hopes of fixing it.