Ls400 limp mode
#1
2nd gear
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Ls400 limp mode
Hi, new to this forum but I'm looking for help. We got a 1991 ls400 and recently it went into limp mode with unburned fuel smoking out of the exhaust. Car won't accelerate past 5pmh and rev past 1500rpm. No check engine code. When I try reading it with obd 1, the check engine light just flashes really fast. I got 2 ecu units from a pick n pull, both from wrecked 91 ls400 with the same part number. Nothing has changed. Has anyone experienced a similar problem?
#2
It is really not easy to tell what's wrong, especially without being able to see the car
Have you opened any of your ECUs to check the condition of the capacitors? All 3 could be bad
If they all check out ok, then the problem is elsewhere
also does this problem always happen? Does it ever resolve? Under what conditions does it happen? (Temperature, driving, in gear, etc)
Have you opened any of your ECUs to check the condition of the capacitors? All 3 could be bad
If they all check out ok, then the problem is elsewhere
also does this problem always happen? Does it ever resolve? Under what conditions does it happen? (Temperature, driving, in gear, etc)
Last edited by CELSI0R; 02-23-24 at 07:33 AM.
#3
2nd gear
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It is really not easy to tell what's wrong, especially without being able to see the car
Have you opened any of your ECUs to check the condition of the capacitors? All 3 could be bad
If they all check out ok, then the problem is elsewhere
also does this problem always happen? Does it ever resolve? Under what conditions does it happen? (Temperature, driving, in gear, etc)
Have you opened any of your ECUs to check the condition of the capacitors? All 3 could be bad
If they all check out ok, then the problem is elsewhere
also does this problem always happen? Does it ever resolve? Under what conditions does it happen? (Temperature, driving, in gear, etc)
#4
If they do, your catalytic converters might be clogged
Next time you run the car, have a look underneath. Probably needs to run about 10 mins
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mikebatman
LS - 1st and 2nd Gen (1990-2000)
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03-30-13 03:32 PM