BFAB
Active member
Absolutely STUMPED on my Ford Ranger.... 1997 4.0l Auto with 5 Speed.
I've had the truck for almost 7 months now have been battling a check engine light now the entire time.. and after reading and reading and reading I have change countless parts and still getting an annoying light.
I had a super intermittent light for quite some time. Thought we had it gone after doing all these things and then went and smogged it and it passed.. NOW MIND YOU i have driven this thing over 4k miles offroad..no issues other than in the beginning it would randomly die when you hit the throttle or let off..
But now the light as soon as I clear it come back instantly. I have checked everything we have done and have the same codes as we did before the smog test.
PO171 BANK 1 TOO LEAN
PO174 BANK 2 TOO LEAN
PO443 EVAP PURGE CONTROL
So far I've changed/done the following..
-All 3 O2 Sensors changed
-Cleaned/Tested MAF
-ALL filters (oil filter, fuel filter, air, fuel pump screen)
-New fuel pump (original tested fine on pressure)
-Idle Air Control Valve
-Cleaned/tested TBPS
-Intake plenum gaskets and upper intake gaskets
-Fuel Cap and filler neck
-Purge control valve and sensor are brand new
-Plugs and Wires
Any ideas before I gut this thing and add some HP via LS MOTOR?
I've had the truck for almost 7 months now have been battling a check engine light now the entire time.. and after reading and reading and reading I have change countless parts and still getting an annoying light.
I had a super intermittent light for quite some time. Thought we had it gone after doing all these things and then went and smogged it and it passed.. NOW MIND YOU i have driven this thing over 4k miles offroad..no issues other than in the beginning it would randomly die when you hit the throttle or let off..
But now the light as soon as I clear it come back instantly. I have checked everything we have done and have the same codes as we did before the smog test.
PO171 BANK 1 TOO LEAN
PO174 BANK 2 TOO LEAN
PO443 EVAP PURGE CONTROL
So far I've changed/done the following..
-All 3 O2 Sensors changed
-Cleaned/Tested MAF
-ALL filters (oil filter, fuel filter, air, fuel pump screen)
-New fuel pump (original tested fine on pressure)
-Idle Air Control Valve
-Cleaned/tested TBPS
-Intake plenum gaskets and upper intake gaskets
-Fuel Cap and filler neck
-Purge control valve and sensor are brand new
-Plugs and Wires
Any ideas before I gut this thing and add some HP via LS MOTOR?