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I had an experience with my 2001 Prius that has me concerned and I was wondering if anyone else has experienced it.

When slowing down to a stop, there was a shudder like a manual transmission car would do when the driver forgets to depress the clutch pedal. ( I pressed the left pedal and the ratcheting sound reminded me what I was driving.) The shuddering continued even when I came to a complete stop and shifted into Park. The shuddering was so severe that the exhaust pipe was rattling. It stopped when I turned off the ignition key. The Prius then started up and ran fine. No problems since.

It seems as though the computer was trying to start the ICE to recharge the batteries, but the generator was in the regen. braking mode, and the two operations were fighting each other.

Does anyone have any ideas or suggestions?

Gene
 

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"Death Shudders"

Been reported in MY01 Prius - described as "Death Shudders". I FORCED it to happen ONCE and only once.
MY conditions were a cold engine, RACING up to a stop sign/light and then coming to a very quick stop. Gentle or normal stop: no problems. Warm engine: no problem.

I believe it was reported to be a Hybrid System ECU software issue.
If you are still in warranty,
If you can either RELIABLY CAUSE it to happen or if you can document the PRECISE conditions under which it happens,
AND
the Prius tech can ALSO make it happen...
Take it in for a checkup.
Also recommend a search through the Yahoo group archives for "Death Shudder".
 

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The motors won't fight each other. For one, both motors are controlled by the same ECU. MG1 would be used to balance the power/torque of the ICE based on what MG2 is doing and should do.

Did the classic have the same cold ICE shutdown shudder as the HSD? HSD does shudder and it is normal. I believe it is to purge the intake manifold of hydrocarbons left there by the atkinson/miller cycle. Both the classic and the HSD use the A/M cycle so the classic could shudder for much the same reason. The timing is a bit different on the classic, so it could have the shudder be more pronounced.
 

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shuddering

Dan, the classic will shudder too, but typically not as severely as Gene reported. Gene, see if your throttle butterfly has a lot of soot on it. Can be easily cleaned.

DAS
 
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