LennyK Posted October 8, 2004 Share Posted October 8, 2004 I seem to have this really odd problem with my LS400. While accelerating at the speed of between 40-60 mile range, the car consistently hesitates, hestation turns into forward shaking. It always goes away when the speed reaches 60, and does not start again untill you get back to 40MPH again. Anyone has any ideas as to what the issue may be. Thanks in advance Quote Link to comment Share on other sites More sharing options...
supacop242 Posted October 25, 2004 Share Posted October 25, 2004 I have the same problem with my 1992 LS 400. Let me know if you find the answer. Quote Link to comment Share on other sites More sharing options...
silvermate Posted October 25, 2004 Share Posted October 25, 2004 is the engine stumbling or cutting out?, meaning does it do it only when you are on the gas at 40mph or does it do it when you are off the gas as well (coasting) or is the car shaking all together when that speed is reached? (non engine related) if it shakes when the car reaches that speed on any occasion these are the things to check for.. Wheel balancing Alignment Tire condition Suspension condition (ie...ball joints, struts, ect....) Quote Link to comment Share on other sites More sharing options...
VBdenny Posted October 26, 2004 Share Posted October 26, 2004 The throttle body is clogging up. Clean it up using O'Bergs tutorial. I have it on file. Quote Link to comment Share on other sites More sharing options...
lexs400 Posted October 26, 2004 Share Posted October 26, 2004 do you ever feel a shudder when the gears shift around 40mph or so ? It could be related to torque converter as well. The throttle body is clogging up. Clean it up using O'Bergs tutorial. I have it on file. ← Quote Link to comment Share on other sites More sharing options...
ThunderRiver Posted October 27, 2004 Share Posted October 27, 2004 It is possible that your air-flow control censor is dying. Make sure you have it checked as it can be dangerous on the road. Quote Link to comment Share on other sites More sharing options...
LennyK Posted November 15, 2004 Author Share Posted November 15, 2004 Thanks for the reply, The hesitation stops as soon as I let of the gas, or if I floor it to reach that 60mph speed. The car seem to idle fine, no known vibration that i can tell, related to tires. thanks -L is the engine stumbling or cutting out?, meaning does it do it only when you are on the gas at 40mph or does it do it when you are off the gas as well (coasting) or is the car shaking all together when that speed is reached? (non engine related) if it shakes when the car reaches that speed on any occasion these are the things to check for.. Wheel balancing Alignment Tire condition Suspension condition (ie...ball joints, struts, ect....) ← Quote Link to comment Share on other sites More sharing options...
duckfat Posted November 15, 2004 Share Posted November 15, 2004 I seem to have this really odd problem with my LS400. While accelerating at the speed of between 40-60 mile range, the car consistently hesitates, hestation turns into forward shaking. It always goes away when the speed reaches 60, and does not start again untill you get back to 40MPH again. Anyone has any ideas as to what the issue may be. Thanks in advance ← I have a 93 LS400 and I have the exact problem you discussed. I tried changing to a different gas but it didn't help. It seems to be related to the RPM (little over 2000), however, when I rev the engine to 2000 in neutral, it's perfect - no hesitation. Quote Link to comment Share on other sites More sharing options...
nc211 Posted February 8, 2005 Share Posted February 8, 2005 Lenny, did you ever figure out what the problem was? I've got a 95 with new motor & tranny mounts, it does the exact same thing. Quote Link to comment Share on other sites More sharing options...
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