rangermidwest
New Member
- Joined
- October 6, 2010
- Messages
- 8
- Reaction score
- 0
- City, State
- Joplin, MO
- Year, Model & Trim Level
- Ranger Custom 1991 2WD
Hey,
I'm a new member. I saw some of the older posts and thought some of you might have some ideas.
I have a long bed 1991 Ranger Custom 3.0L MFI. EEC-IV.
A4LD 2 solenoid automatic. Low miles 80,000 but old.
It quit locking the torque converter up at lower
speeds.
It waits until ~50 mph. 3-4 shift is totally
normal. I cleaned the valve body and raised the line
pressure Very slightly and adjusted the bands. All shift points are the same. It works really well except for the late TCC lockup. The solenoids are 2nd generation and check good both off the valve body and through the EEC harness.
I put a meter and an LED on the purple and yellow wire that the PCM grounds the TCC override solenoid through. The computer just doesn't ground the wire until 50 mph.
Question: It is not the VSS [I think?] because the
3-4 shift is normal at the correct speeds. I replaced
the TPS and there was no change. [Ouch] I guess
it could be a bad new part but probably not.
MAF is cleaned and the engine runs like a 3.0L Ford.
enough power pretty normal. The ECT sensor could be bad but is not reported on the KOEO self test of the EEC-IV. [Pass 11]
What's wrong here I don't want to believe the computer just quit this one function. It actually does lock the TCC, just late.
Any ideas?
I'm a new member. I saw some of the older posts and thought some of you might have some ideas.
I have a long bed 1991 Ranger Custom 3.0L MFI. EEC-IV.
A4LD 2 solenoid automatic. Low miles 80,000 but old.
It quit locking the torque converter up at lower
speeds.
It waits until ~50 mph. 3-4 shift is totally
normal. I cleaned the valve body and raised the line
pressure Very slightly and adjusted the bands. All shift points are the same. It works really well except for the late TCC lockup. The solenoids are 2nd generation and check good both off the valve body and through the EEC harness.
I put a meter and an LED on the purple and yellow wire that the PCM grounds the TCC override solenoid through. The computer just doesn't ground the wire until 50 mph.
Question: It is not the VSS [I think?] because the
3-4 shift is normal at the correct speeds. I replaced
the TPS and there was no change. [Ouch] I guess
it could be a bad new part but probably not.
MAF is cleaned and the engine runs like a 3.0L Ford.
enough power pretty normal. The ECT sensor could be bad but is not reported on the KOEO self test of the EEC-IV. [Pass 11]
What's wrong here I don't want to believe the computer just quit this one function. It actually does lock the TCC, just late.
Any ideas?