Eng Refresh + LMA, etc 57
by
, 30-05-2017 at 09:36 PM (6244 Views)
Based on the VIN, this NSX left the factory with 1st gen. ABS.
However, it has 2nd gen. one so the owner is very lucky as it has much better protection against the leaky solenoid issue that many 1st gen. ABS users are suffering from.
Still, if you don’t exercise your ABS regularly, you will end up with leaky solenoid issue as well as the stuck closed solenoid.
Cleaned the reservoir first in preparation for flushing the accumulator.
So muchy air trapped in the accumulator.
I had to drain the ABS SST four times before I can release all of the pressure.
I always see lots of air in the accumulator but not many systems showed this level of air.
Probably never flushed in the past.
The owner told me that he has never exercised the ABS during his ownership……
He heard ABS pump activated whenever he took the car out for spin but never had ABS warning light.
Many owners think that this would be a good sign of healthy classic ABS…..
I’m afraid not........
And my concern became the reality.
3 out of 4 solenoids were completely stuck closed.
This means that only one wheel (Message to the owner: only the Front Right wheel has operational ABS)
has ABS control so it’s the equivalent of no ABS at all.
There is a special know-how to unblock these stuck closed solenoid but no matter how many times I tired, none of them improved.
Later, during the test driving session, I applied hard braking many times while the tyre was cold from about 10mph but always locked up and
when I got back, tested the bad 3 solenoids but still no changes.
I had similar situation on another NSX and for this, I asked the owner to exercise the ABS every day for about a week and then come back to my place
to check the stuck closed solenoids.
This trick worked so I hope the owner will do the same but probably require much longer exercising days.