"Limp mode" on a 4l60e is 3rd gear. The way you can tell is both shift solenoids will be OFF.
"Limp mode" on a 4l60e is 3rd gear. The way you can tell is both shift solenoids will be OFF.
89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
05 Outback XT 2.5L turbo gas auto
is it possible it's putting itself into limp mode because of the codes being set? either way i would get that in order especially if it's fine on initial drive and then goes into limp mode.
Friends,
Today I did a new 'test drive' which lasted about 30 minutes.
First I warmed up the engine.
I used the TunerPro log recorder.
Initial Conditions:
Engine Temperature: 176 degrees
Transmission temperature: 86 degrees
Oil pressure: 65 lbs (idle).
During the first 12.5 minutes, I did a mixed course and everything went perfectly. All gears shifted correctly including TCC. Oil pressure varying by load.
Engine temperature: 190 degrees
Transmission temperature: 155 degrees
Oil pressure: 65 lbs (idle).
Then, from the 13th minute onwards, the gear 'locked' in 2nd and the oil pressure practically fixed at 110 pounds. I drove home for a few more minutes.
Final conditions: Engine temperature: 183 degrees
Transmission temperature: 220 degrees
Oil pressure: 110 lbs.
I turned off the engine. After every 5 minutes I turned it on and wrote down the pressure. After approximately an hour the pressure returned to normal (idle, 65 lbs).
My impression is that the ECM is forcing this situation, I just can't figure out the cause. Clearly it's turning on solenoid B and putting a current of 0.7 amp into the Force Motor.
Any idea?
85 Berlinetta - from 305 carb to '7427 - 700R4
67 Camaro - from 350 carb to '7427 - 4L60e
87 Corvette - MPFI - 700R4 - stock
95 GMC Sonoma - TBI (my $0D lab)
08 Pontiac G8 - stock
Trans over temp? Hot mode?
89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
05 Outback XT 2.5L turbo gas auto
85 Berlinetta - from 305 carb to '7427 - 700R4
67 Camaro - from 350 carb to '7427 - 4L60e
87 Corvette - MPFI - 700R4 - stock
95 GMC Sonoma - TBI (my $0D lab)
08 Pontiac G8 - stock
220* is not normal, might be worth looking at the parameters for trans temp to see how close you are getting.
89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
05 Outback XT 2.5L turbo gas auto
85 Berlinetta - from 305 carb to '7427 - 700R4
67 Camaro - from 350 carb to '7427 - 4L60e
87 Corvette - MPFI - 700R4 - stock
95 GMC Sonoma - TBI (my $0D lab)
08 Pontiac G8 - stock
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