FlipFlopFabworx
New Member
- Joined
- Jul 22, 2018
- Messages
- 7
- Reaction score
- 0
- Points
- 0
- Vehicle Year
- 1993
- Make / Model
- ford
- Engine Size
- 4.0
- Transmission
- Manual
Hey guys,
been in this game a long time, I've had both a 1999 and a 1996 ranger before but have been out a minute (long enough to get my old acct shut down). recently i picked up my 1993 4.0 ext cab manual trans for 700 bucks with a bad motor. Installed a junkyard 4.0 along with a host of new parts and it has been a killer daily driver except for an intermittent rough idle and lack of power.
Symptoms: rough shaky "missing idle" lack of power under 2800 rpm, poor fuel mileage. sometimes it is smooth as butter and runs with great power, sometimes sitting in the drive through and idling it catches itself and will idle up and smooth out, sometimes it wont.
Codes: After fixing the bad battery, the only persistent KOER codes are HEGO o2 always rich. no other codes are present and it will OCCASIONALLY kick a CEL once its warm in the same spot on my morning commute and it will go away in 30 sec or so. no stored KOEO codes
What i have replaced/fixed/inspected:
New Intake air temp sensor
new steel intake tube to replace cracked oem
new motorcraft engine coolant sensor
Fuel pressure key on at 32 psi, will climb with engine running and throttle application to high 30's
Checked intake and plenum gaskets for leaks with carb cleaner
checked engine vacuum for evidence of blocked exhaust (vac good)
run with new MAF and OEM MAF (no change)
tps passes "goose test" when running KOER diagnostic
new NTK o2 sensors
fixed PO's massive exhaust leaks
FPR vac line does NOT have fuel inside of it
The problem has improved, but i mostly credit that to fixing the busted ass intake tube, now im hunting the source of richness and i'm running out of ideas and i don't really have a throw parts at it budget
and the first person to tell me to search is getting pistolwhipped, I've been researching this problem for a few weeks and i'm exhausting a lot of the usual suspects
been in this game a long time, I've had both a 1999 and a 1996 ranger before but have been out a minute (long enough to get my old acct shut down). recently i picked up my 1993 4.0 ext cab manual trans for 700 bucks with a bad motor. Installed a junkyard 4.0 along with a host of new parts and it has been a killer daily driver except for an intermittent rough idle and lack of power.
Symptoms: rough shaky "missing idle" lack of power under 2800 rpm, poor fuel mileage. sometimes it is smooth as butter and runs with great power, sometimes sitting in the drive through and idling it catches itself and will idle up and smooth out, sometimes it wont.
Codes: After fixing the bad battery, the only persistent KOER codes are HEGO o2 always rich. no other codes are present and it will OCCASIONALLY kick a CEL once its warm in the same spot on my morning commute and it will go away in 30 sec or so. no stored KOEO codes
What i have replaced/fixed/inspected:
New Intake air temp sensor
new steel intake tube to replace cracked oem
new motorcraft engine coolant sensor
Fuel pressure key on at 32 psi, will climb with engine running and throttle application to high 30's
Checked intake and plenum gaskets for leaks with carb cleaner
checked engine vacuum for evidence of blocked exhaust (vac good)
run with new MAF and OEM MAF (no change)
tps passes "goose test" when running KOER diagnostic
new NTK o2 sensors
fixed PO's massive exhaust leaks
FPR vac line does NOT have fuel inside of it
The problem has improved, but i mostly credit that to fixing the busted ass intake tube, now im hunting the source of richness and i'm running out of ideas and i don't really have a throw parts at it budget
and the first person to tell me to search is getting pistolwhipped, I've been researching this problem for a few weeks and i'm exhausting a lot of the usual suspects