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Clutch pedal help in first gear, engine lunges forward.

M

miri

Diamond Member
Ok, when I am accelerating and push the clutch pedal down fast in first gear the engine seems to lunge forward. If I push the clutch pedal down moderatly everything is smooth. It only happens in first gear and I make sure my foot is off the gas before I push the clutch pedal down. What is causing the engine to lunge forward when I quickly push the clutch pedal down?

This is a Scion TC with a little over 1000 miles.
 
Can you explain what the correct way is? This is my fourth manual and the first time I have encountered this problem.
 
What does "the engine seems to lunge forward" mean? Does the clutch fail to disengage? Do the RPMs increase? Does the engine actually move forward? 'Cause that's bad.
 
It seems like the engine is moving foward for some reason when I quickly push the clutch pedal down. If I moderatly push the clutch down it is fine though. Bad transmission?
 
sounds liek something is not working right with the master clutch cylinder, or the slave cylinder.


edit: actually you did say it happens only in first gear......hmmmmmmm
 
Originally posted by: miri
It seems like the engine is moving foward for some reason when I quickly push the clutch pedal down. If I moderatly push the clutch down it is fine though. Bad transmission?
Click to expand...

If you put the car in neutral and rev the engine, is that the same feeling?
 
Originally posted by: TechnoKid
sounds liek something is not working right with the master clutch cylinder, or the slave cylinder.


edit: actually you did say it happens only in first gear......hmmmmmmm
Click to expand...


Yeah weird, I guess I can moderatly push the clutch pedal down in first gear.
 
Originally posted by: KingNothing
Originally posted by: miri
It seems like the engine is moving foward for some reason when I quickly push the clutch pedal down. If I moderatly push the clutch down it is fine though. Bad transmission?
Click to expand...

If you put the car in neutral and rev the engine, is that the same feeling?
Click to expand...

No, if I put the car in neutral and rev, it is smooth as it climbs up in RPM.
 
Originally posted by: sniperruff
time to trade in for a lovely hyundai accent
Click to expand...

Sometimes I wish I bought that 2005 Nissan Altima for only 1000 more and it came with a Auto.
 
Some in another forum said that I should be letting off the gas gradually as I push in the clutch pedal? I thought you were supposed to have your foot off the gas before you push the clutch pedal?
 
say you are doing 4000rpm in first gear and suddenly let off the gas pedal, the car will jerk and lunge, or at least it should.

Now, i have never experienced the lunging/jerking if i immediately push the clutch pedal right after suddenly taking the foot off the gas.
 
Originally posted by: miri
Originally posted by: sniperruff
time to trade in for a lovely hyundai accent
Click to expand...

Sometimes I wish I bought that 2005 Nissan Altima for only 1000 more and it came with a Auto.
Click to expand...

the tC looks so much better though, and this is coming from a guy who likes the new altima.
 
I leased a 99 altima and thought it was a great car except for the bland styling. At least Nissan air conditioners work really good and their stock stereos sound better. My 2003 Honda Civic and my 2005 Scion TC have weak air conditioning compared to my old 99 2.4 Altima. The Scion TC even has more horsepower than the 99 Altima.
 
Normally I'd suggest checking the motor mounts, but if this is a new car....

Also my topaz does this and I hear an exhaust rattle when I do it, nothing major I figure.
 
That's odd, when you clutch in, your car lunges forward? I would think that this disengages the tranny/engine, so the car should just coast... 😕
 
I don't know enough about the way the enigne is mounted in the Scion, but I can guess at what is happening. the first gear of the scion is 3.5:1, which is decently high. When you are punching the clutch to 0the floor, you are disengaging a good amount of rotating mass from the road immediately, which is being amplified 3.5 x (diff ratio).

This energy has to go somewhere, and the only thing that allows movment are the engine/trans mounts. There is probably very little play in them, but since the top of the engine is likely 12+ inches from the mounts, the top of the enigne moves pretty far. This is amplified by being a FWD car with a transverse engine.

I would have the mounts inspected anyway, or at least have the dealer you bought it at take a look at it to make sure the symptoms you are experencing are normal.

Diagnosing something that is 100% visual on a text message board is nearly impossible.
 
Originally posted by: miri
Some in another forum said that I should be letting off the gas gradually as I push in the clutch pedal? I thought you were supposed to have your foot off the gas before you push the clutch pedal?
Click to expand...

No you're not. You're supposed to have your foot slightly still on the gas pedal, otherwise the gear will end up braking your clutch, causing your car to suddenly slow down very fast.

Maybe this just happens on my old stick.. 92 corolla.
 
Originally posted by: virtualgames0
Originally posted by: miri
Some in another forum said that I should be letting off the gas gradually as I push in the clutch pedal? I thought you were supposed to have your foot off the gas before you push the clutch pedal?
Click to expand...

No you're not. You're supposed to have your foot slightly still on the gas pedal, otherwise the gear will end up braking your clutch, causing your car to suddenly slow down very fast.

Maybe this just happens on my old stick.. 92 corolla.
Click to expand...

Interesting, did not know that you should still have your foot on the gas when you push the clutch pedal down.
 
So if your in a parking lot cruising really slow in first gear without gas, and push the clutch pedal down fast your engine will lunge forward because there is no gas being applied? If I am in a parking lot going really slow without gas and I push the clutch pedal down fast, my engine lunges forward.
 
Originally posted by: virtualgames0
Originally posted by: miri
Some in another forum said that I should be letting off the gas gradually as I push in the clutch pedal? I thought you were supposed to have your foot off the gas before you push the clutch pedal?
Click to expand...

No you're not. You're supposed to have your foot slightly still on the gas pedal, otherwise the gear will end up braking your clutch, causing your car to suddenly slow down very fast.

Maybe this just happens on my old stick.. 92 corolla.
Click to expand...


are you sure? doesn't the engine rev up when you push the gas while you push on the clutch? wouldn't that damage the car more?

i think you're suppose to let go of gas when you shift? i'm probably wrong... never drove a stick
 
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