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car bucking when pushed hard in D.

2K views 13 replies 7 participants last post by  Brett_the_bomb 
#1 ·
01 LS....when she is in drive and i get on her a lil bit. she has started to "buck" on me. almost feels like she is jumping in and out of passing gear. i have enuf fluid and a filter for a pan drop/filter change. gonna do that prob. in a day or so. but wanna know if there is anything i should also look into while i have the pan off.
oh yeah. she does not do this in "3".
hope you all can help. thanks for your time in advance.
 
#2 ·
Check engine light?
 
#5 ·
okay she was better but not quite fixed. never really popped her into true passing gear that first day,but when i did she still bucks. but not when the car is cold. only after reaching full operating temp. now how much should i be looking at fund wise to get the cat checked?
 
#8 ·
Had same problem with my 2002 regal ls, turned out to be bad mass airflow sensor. You might try cleaning your MAF with the proper cleaner cost $5. New sensor $136 to $179.
Mine did not set a code either.
 
#7 ·
Probably one hour diagnostic time, depends where you go.
 
#10 ·
Unless you have a PCM tune that removed the P0420 code from the system, I wouldn't do that. Aftermarket cats are notorious for throwing that code in these cars, still cheaper to get a $40 cat and $150 tuned PCM than to get a $400-500 factory cat...
 
#14 ·
I have this "Bucking" problem 2 times. Ive owned my 01 ls 3800 for 8+ years with 261k miles. both times it was the mass air flow sensor. The problem didnt occur unless the car was in gear but nearly without fail if i got into the pedal it would happen. cleaner sadly never worked for me.
 
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