1996 S10 jumps when initially starting

Asked by Apr 09, 2018 at 06:09 AM about the 1996 Chevrolet S-10

Question type: Maintenance & Repair

My S10 seems to "jump or lerch"when initially starting it.  It has a new fuel
pump, fuel filter, starter, spark plugs, spark plug wires and battery.  It does
this after sitting for awhile or first thing after sitting overnight.  It's almost like
someone is taking heart shock paddles to it.  Any idea what's going on?  

2 Answers


GM has released several TSBs over the years on this, as it happens with more than a few of their models. According to the TSB, 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." If the "lunge" seems excessive, you may want to check condition of tranny fluid or clutch packs.

Thank you. I will look into that.

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