Acceleration/Deceleration

[A Dying Devotion]

Ok couple issues here first when I am cruising and I let off the gas then the whole car kinda jumps forward then if I barely tap the gas it takes a second but the car does the opposite and really kicks in, normal? Also while in first gear if I start in first then get moving and let off the gas keeping it in first then go to gas it again the car will jump back and forth given the more gas I give it. This is my first manual tranny car so I dont know if its normal or not. Thanks guys

[Jeff240sx]

I'm not really comprehending your explanation.. but I'm pretty sure that's normal... it's basically letting your engine do the braking as you let off the gas, so it will lurch forward and begin slowing down, less harshly as the gears go higher.
-Jeff

[misnomer]

We call it "torque" back where I come from

[JerkFaceJason]

It's normal, try easing off of the gas a little more and it wont jump :)

[A Dying Devotion]

Ok for the first gear question this is what happens when im driving in first I leave it in first and take my foot off the gas. Ok all is good up till here then when I go back to give it more gas the car will jump rpms and shake violently back and forth it will go up to say 3k hesitate go up to 3200 hesitate 3400 hesitate etc but if I just through it into 2nd its fine not really that big of a deal but wasnt sure if anyone else has the prob.

[240sxspeedracer1]

first gear is very sensitive. It climbs up very fast, so any little tap while you already got the car rolling will induce this very violent motion. Any other gear would be fine if you tapped the gas after already rolling.
Anyway, after you start rolling with first gear, when you hit around 3k you should get into second gear. Preserve your car, and treat it right and it will last a long time. Go any higher only if you need to or if your on the track or something.

[vg30s12]

If the lurching is excessive, you may have a bad Throttle Position Sensor. This tells the engine whether to run in 'idle' or 'run' mode. Lurching on deceleration is often a sign of a bad TPS.

[huntz0r]

Yeah the throttle is very very touchy. The rocking forward and backward is likely exacerbated by the softening stock rubber subframe bushings (someone described this as feeling like the rear end is connected with rubber bands, very apt :)). Spacers will clear up this problem, but you still need a bit of finesse with the throttle. The car just really likes to move...

[mrdirty]

Nothing u can do but learn to drive it; here's what's happening:
1- U hit throttle
2- Acceleration pushes u back in your seat taking your right foot w/ you
3-Foot comes off gas jerking u forward w/ engine braking
4-Foot slams into gas

[A Dying Devotion]

thats most likely it that and the fact I have only been driving stick for a week or so now stil learning how to feather gears and such.

[Natty]

The thing I hate hate hate about my 240sx is first gear. It climbs fast which is good, but you have to be soooo smooth on it. It doesn't help that my pedal is twitchy either. I need to clean my throttle body one of these days.
Jeff

[thx247]

the rocking your describing sounds more like a bad part in the suspension somewhere.

Things that could be the solution...bushings could be shot, shocks shot, motor mounts broken somehow, transmission loose, tie rods loose

I would check those out the suspension before anything else.

[RedlineRacer]

It sounds more like what mrdirty is saying. When I first started learning to drive a stick I did the exact same thing. You just need to get use to the clutch and know how much gas to give it.

[vg30s12]

You also might want to check for slack in the throttle cable. Even if you push the gas pedal gently, if there's slack in the cable that gentle movement might translate to a harsh movement of the throttle.