Who's Had The Shaking,Jarring, Bucking at 1st and 2nd gear?
Who's Had The Shaking,Jarring, Bucking at 1st and 2nd gear?
OK, I have searched through the forums and I found a lot of people have this problem but I don't see anyone's post about how they fixed it. Yes, It only happens when the car warms up and when I start out in first and it hits 2k rpm it jerks me around like i'm on a damn rollercoaster ride until I push the clutch in and shift to third.. that's when it seems to go away. My plugs and wires are good i know for a fact. the ecu is not throwing any codes. I put a different maf on it and it's still doing it. I'm so close to driving this thing off of a cliff, someone help meeee!
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InsanityInc
- Posts: 2521
- Joined: Wed Aug 18, 2004 7:43 am
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zer0c123
- Posts: 407
- Joined: Sat Sep 20, 2003 9:39 pm
- Car: 1993 Nissan 240SX Hatch
- Location: Bay Area Norcal
Re: (tiger)
Edit: since you have no egr.
This weird shaking problem pisses me of too. I went back to the mechanic 3 times to get him to fix it. The car was smoother each time he did something, but no where near perfect. What really worked was unplugging one of the egr hoses, but since you don't have it...
Modified by zer0c123 at 3:40 AM 6/17/2005
This weird shaking problem pisses me of too. I went back to the mechanic 3 times to get him to fix it. The car was smoother each time he did something, but no where near perfect. What really worked was unplugging one of the egr hoses, but since you don't have it...
Modified by zer0c123 at 3:40 AM 6/17/2005
maybe i'm retarded... now.. I have just recently come back to the states... I was used to having an SR20det and it didn't have all that junk right beside the intake plenum... what is it? EGR, AIV.. the mushroom cap thingie? I'm learning about the ka and ever since i've had it.. one darn problem after another and its so depressing.
Re: Who's Had The Shaking,Jarring, Bucking at 1st and 2nd gear? (tiger)
Hey...I'm new here, but I know what this problem is.
First off, I'v been working on 240's for a good 8 years or so and have purpose built a few for SCCA & Auto Cross racing.
After doing tune-ups, changing plugs, wires, & coils, then adding CAI's and exhaust systems the motor will run smoother so that will sort of get rid of the bucking. But NONE of those are the problem.
If you pay attention to whats happening you'll notice that your shifter is also rocking back and fourth pretty hard as the car bucks. That should be an INSTANT indication as to what the problem is.
After experiencing the same problem and doing some digging, I'v found that the problem is BAD ENGINE & TRANSMISSION MOUNTS. If the mounts are bad, they give the entire motor & driveline way too much play.
As the motor/trans snap back into place during an acceleration event it causes the car to jerk which in turn causes you to inadvertantly press on the gas pedal a bit. This keeps the entire cycle going until you either lift completely off the gas or push in the clutch.
Next time you take your car out, try this experiment:
Get going, shift to second & cruise for a bit then goose the gas a coupla times. This should set the bucking into motion.
Easy solution: Install new motor & trans mounts.I fabbed up my own solid mounts and NEVER had this problem again.
First off, I'v been working on 240's for a good 8 years or so and have purpose built a few for SCCA & Auto Cross racing.
After doing tune-ups, changing plugs, wires, & coils, then adding CAI's and exhaust systems the motor will run smoother so that will sort of get rid of the bucking. But NONE of those are the problem.
If you pay attention to whats happening you'll notice that your shifter is also rocking back and fourth pretty hard as the car bucks. That should be an INSTANT indication as to what the problem is.
After experiencing the same problem and doing some digging, I'v found that the problem is BAD ENGINE & TRANSMISSION MOUNTS. If the mounts are bad, they give the entire motor & driveline way too much play.
As the motor/trans snap back into place during an acceleration event it causes the car to jerk which in turn causes you to inadvertantly press on the gas pedal a bit. This keeps the entire cycle going until you either lift completely off the gas or push in the clutch.
Next time you take your car out, try this experiment:
Get going, shift to second & cruise for a bit then goose the gas a coupla times. This should set the bucking into motion.
Easy solution: Install new motor & trans mounts.I fabbed up my own solid mounts and NEVER had this problem again.
Re: Who's Had The Shaking,Jarring, Bucking at 1st and 2nd gear? (Trixta6)
Trixta - you wouldn't happen to have a writeup on those, would you?Trixta6 wrote:...Easy solution: Install new motor & trans mounts.I fabbed up my own solid mounts and NEVER had this problem again.
James
Re: Who's Had The Shaking,Jarring, Bucking at 1st and 2nd gear? (jjg25)
No, but when I go back to work, I'll see if I can find the Prints I drew up.jjg25 wrote:
Trixta - you wouldn't happen to have a writeup on those, would you?
James
But a short run down... I used a good amount of stainless C Channel, Grade 10 bolts + Nuts, and Black Delrin.
Re: Who's Had The Shaking,Jarring, Bucking at 1st and 2nd gear? (tiger)
When I pulled my KA engine with 157k I noticed both of the front mounts were torn only after I removed the mounts to inspect them. You cannot tell from the top by looking at them. The hard rubber rips out at the top or the bottom under the metal part of the mounts. My trans mount was in good shape so I really didn't get a lot of bucking but if it were bad too I'm sure you would see the shifter moving all over the place because the whole engine and transmission would be left attached and held in by not much more than the main drive shaft to the rear end!. Don't take the post by Trixta lightly as you might think you have good mounts but they are most likely torn if everything is flopping around like he says.