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Old 11-28-2010, 09:33 PM
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Forward lunge in park when starting engine

I've noticed this issue on 3 of our 4 vehicles (the 3 with 4L60E/700r4 of course).

When I go to start any of them and they're stone cold, sometimes I get a lunge while in park as the engine starts. Not a huge one that would spill your coffee, but enough that you notice it- almost as if someone is behind your car giving it a good shove to unstick you from snow.

Is this a precursor to major work, or just part of a cold transmission?
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Old 11-28-2010, 11:02 PM
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My 03 GP does the same thing. In park, hit the key, engine starts, and the car moves forward 2-3". I just figured it's normal on the first start of the day. Been doing it since new and have 110,000 mi on it. Never been a problem to this point.
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Old 11-29-2010, 04:45 AM
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it is normal, as there is a tsb on it.
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Old 11-29-2010, 10:11 AM
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THANKS!

You don't happen to have a number for the TSB or a link to it by chance?

I'm curious as to why it happens, and what fixes, if any there are.
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Old 11-29-2010, 10:48 AM
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Quote:
Originally Posted by HawkZ28
THANKS!

You don't happen to have a number for the TSB or a link to it by chance?

I'm curious as to why it happens, and what fixes, if any there are.
the tsb is: 08-07-30-026. there is no fix as this is typical among the majority of the automatic trans manufacturers.

here is a copy and paste from alldata about the bulletin.

Bulletin No.: 08-07-30-026

Date: May 22, 2008

Subject:
Information on Slight Vehicle Movement In Park At Start Up After Cold Soak

Models:
2009 and Prior GM Passenger Cars and Light Duty Trucks (including Saturn)
2009 and Prior HUMMER H2, H3
2009 and Prior Saab 9-7X

with Automatic Transmission

Some vehicles may rock or move slightly forward or rearward while in park at start up after cold soak. This condition may be accompanied by a clunk noise. This is a slight movement that is more often seen visually, rather than felt, when viewed from the outside and using the auto-start feature, if equipped.

This slight movement is due to the residual transmission fluid in the clutch packs that creates a partial apply on start up. This movement is stopped by the parking pawl and/or transmission fluid exhausting completely from the clutch packs.

This slight movement has no adverse affects on the transmission and no repair should be attempted. This condition is normal. This can be verified by comparing with another identically built vehicle under the same cold conditions.

To prevent this condition from occurring, the parking brake should be utilized as per the Owners Manual recommendations anytime the vehicle is parked.

hope this helps
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Old 11-29-2010, 01:35 PM
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Perfect! THANKS for the info!
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