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Car jerks when accelerating from a stop only happens once in a while

#1 User is offline   TookayS2K 

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Posted 23 April 2009 - 12:48 AM

Any of you guys have this problem?

Once in a looong while, when I'm at a complete stop and try to start, it seems like I just started driving a manual for the first time. :( It jerks like no other and I have to ride the clutch just to get it going smooth. It's really hard to explain... It's like the clutch enagement point just suddenly goes crazy.

I kind of noticed it happening when I'm rolling up and down when I'm at a hill. Ya know, just kind of playing with the car while at a stop; going back and forth. As soon as the light turns green and I try to go, it happens. I either have to ride my clutch, or completely stop to start smoothly again.

any ideas? :confused:

This post has been edited by Teawins21: 23 April 2009 - 12:50 AM


#2 User is offline   J0eys2k 

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Posted 23 April 2009 - 01:42 AM

Could be your map sensor, I had similar problems like yours, violent jerking in 1st gear from a start. Replace my map sensor and haven't had the problem since. But it could be something else too :(

#3 User is offline   my2ks2k 

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Posted 23 April 2009 - 09:35 AM

mine does this periodically, i just clutch in and start over.

i attribute it to the rawness of the racier AP1 :D
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#4 User is offline   iatros 

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Posted 23 April 2009 - 09:59 AM

I think i experience what you are describing every once in a while. It only occurs for me in the morning when the car is first being started up and im heading down the street. It only occurs in 1st gear too and once second comes around, the jerkiness is gone. This jerkiness only occurs when im on, say, only 15-20% of the throttle. It goes away after the shift and doesnt return. Kinda weird, but it makes me laugh cause the wife looks at me like "what the hell are you doing??!! :LOL:

#5 User is offline   3r1k 

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Posted 23 April 2009 - 10:01 AM

It happens to me as well.. I don't know why but just clutch in and she will be fine.

#6 User is offline   TookayS2K 

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Posted 23 April 2009 - 10:14 AM

Good to know I'm not the only one. But yes, if once I shift to 2nd, everythings good. I can't remember if clutch in works for me... I think I would have to hold it down for a good 2-3 seconds. If remember correctly, I either have to ride the clutch, shift or stopping completely for it to stop jerking.

Haha, but yes i feel so dumb when it happens. Especially when somebody is in the car with you, or when somebody is right behind you... It makes it seem like you can't drive worth crap.

#7 User is offline   SSM_S2k 

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Posted 23 April 2009 - 12:08 PM

it happens to me too...but once its warmed up its good...i also noticed that if the rpm is below 2k it feels so week then once it passes 2k it just picks up like the vtec kicked in...as for the jerkiness, i believe the car just need to warmed up..atleast for me it works...but ofcourse sometimes the jerkiness happens from a stop then you go..i learned how to managed and live with it...maybe i just need to replace MAP sensor or something

#8 User is offline   TookayS2K 

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Posted 23 April 2009 - 01:22 PM

do you guys find that it happens mroe when you are "rolling" the car?

#9 User is offline   funat9000rpm 

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Posted 23 April 2009 - 01:27 PM

Reading this thread, it seems to happen to everybody... me included :D
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#10 User is offline   Bugs2k 

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Posted 23 April 2009 - 01:56 PM

guys this thing you are experiencing is called "HEAT SOAK" it is attributed to the intake manifold temps rising and not allowing them to burn properly. research the intake manifold gasket by hondata.
http://hondata.com/h...ieldgasket.html
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#11 User is offline   slalom44 

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Posted 23 April 2009 - 04:01 PM

I have a different opinion on this. I believe that heat soak starts the problem and the rest is caused by the momentum of your body being transferred to your foot. The same condition has been described as "kangarooing" and "bucking" when you're creeping along slowly in traffic (less than 2mph) then you press the gas pedal an your car starts bucking.

In an S2K, you are sitting very low to the ground. If you press the accelerator hard and heat soak temporarily bogs the engine, your whole body lurches forward and your foot actually presses the gas pedal further down. When the car finally surges forward, your body is thrown back in your seat and your foot is being pulled back. Then your body momentum swings back forward, so does your foot. You don't even know that you're doing it because you don't realize that your foot is moving on the gas pedal.

Don't believe me? When you think this condition might happen, try wedging your right foot against the carpet next to the gas pedal as you accelerate. By doing this, you don't transfer your body motion to your foot. This doesn't prevent the heat soak that causes it to bog in the first place, but it prevents you from going into the vicious bucking motion.


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#12 User is offline   ~blacks2k~ 

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Posted 23 April 2009 - 06:58 PM

Happens to me every so often as well...always either in first or second gear at low speed...very annoying and embarrassing!!

#13 User is offline   Hero 

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Posted 23 April 2009 - 07:56 PM

it has nothing to do with heat soak. i've had it happen with only 2 bars warmed up in like 60 deg. weather.

it's just that kangaroo jump we all get. sometimes the car just acts up when you don't do everything right. it's more of a you problem then the car. don't worry, nothing's broken.

we've all done it...and we'll all do it again. best thing to do is just press in the clutch and start again. and yes, this happens to me from a very slow roll, not a stop.

im guessing this is why ap2 have the clutch delay as help to stop this? i don't know...makes sense i suppose.

#14 User is offline   Hero 

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Posted 23 April 2009 - 07:57 PM

check this too....everyone posting but one has an ap1 :D

#15 User is offline   s2k aok 

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Posted 23 April 2009 - 08:12 PM

i get the kangaroo/bucking every once in a while, it starts easy but then amplifies as you are slammed forward and backward as your foot gets modulated by your body momentum and further modulates the pedal. with the 4.77s it is a lot more pronounced.
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#16 User is online   starchland 

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Posted 23 April 2009 - 08:28 PM

ok sure bang the map sensor...but has anyone ever tried cleaning the tiny little hole it gets its reading from?
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#17 User is offline   JBrakeS2K 

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Posted 23 April 2009 - 08:38 PM

Same thing happens to me too sometimes. I've had the same thing happen when I'm driving the tanker trucks I work around at work, but the seat is springy as all hell in the trucks. I could blame it on this in the S2K aswell, but when I drive my eg it never happens. Neither of those have springy seats (obviously). I thought it was my clutch at first, then just operator error, but after reading the heat soak article my ideas changed. Its occured to me at all times, when the weather is cold, hot, and when ive driven the car for 5 minutes or for an hour. I have a stock chattery clutch in an 01 with 75k on the odometer. I would say its the heat soak issue, but thats just me. I learn to live with it, kinda funny looking like a tool sometimes anyways. Good times :p

#18 User is offline   sola77 

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Posted 23 April 2009 - 10:01 PM

The lighter AP1 flywheel 'may' be the biggest contributing factor as to why there are no AP2 drivers chiming in with similar experiences. On a 4 cylinder engine you can only get away with so light a flywheel on a street friendly car. 2 power strokes per crank revolution on a 4 banger, 3 on a 6, 4 on a 8, and 6 (yea) on a 12! Hence you can understand why a V12 requires the scantiest of flywheels and still remains supremely smooth. Crawling in 1st gear (guessing under 1500rpm) on my AP2 is not great but does not hobby horse either, slash a sizable chunk of flywheel weight off and I am sure it would be herky jerky. Try to keep your revs up just a bit and you should be able to avoid the bobbing.
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#19 User is offline   slalom44 

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Posted 24 April 2009 - 06:10 AM

Quote

we've all done it...and we'll all do it again. best thing to do is just press in the clutch and start again. and yes, this happens to me from a very slow roll, not a stop.

Nope. We all aren't going to do it again. As I said, I figured out what caused it and it hasn't happened again in years. If you want to live with it, that's your call. But it's so simple to prevent.

#20 User is offline   TreyDM 

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Posted 24 April 2009 - 09:46 AM

You guys are describing 2 different problems that ultimately have the same outcome.
Bucking and the feeling like a misfire under acceleration.

The "bucking" at low speeds is simply caused by a chain reaction resulting from slightly off fuel maps and throttle postion values (no oem ecu has perfect values). The first buck is usually caused by the ecu, then the combination of a very close first gear with the momentum of your foot create like a yo-yo effect that makes your foot press-backoff-press-backoff on the accelerator pedal. The first gear ratio is what makes it so sensitive.

Now the other concern. Under hard acceraltion, it feels like a misfire or "bog" when you are in your powerband. This concern is related the map sensor connector. Honda has a TSB in which the map sensor is replaced and a plastic lock is supplied with it to sercurely fasten the connector to the sensor. The actual problem is under extreme vibration, or engine load, (usually in vtec) the pins in the map sensor connector will vibrate so much they lose a good connection with the sensor. When the ecu sees no map sensor value it cuts spark. This usually happens so fast that the ecu doesn't throw a cel. This concern happens in any gear, usually third is the most common. To fix you really only have to buy the map sensor connector. Honda replaces the map also as a safety in case pins are damaged someone on the old map sensor from the vibration. Oh this concen also makes it self more prone to vehicles with exhausts systems. Honda knew how bad the problem was so they put those connectors on all AP2s from the factory. TSB applies to all AP1 vehicles.
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#21 User is offline   ian02s2k 

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Posted 24 April 2009 - 12:52 PM

Quote

ok sure bang the map sensor...but has anyone ever tried cleaning the tiny little hole it gets its reading from?

I sure did! Cleaned it out with some carb cleaner, and also cleaned the throttle plate, and wow, no more bucking, and drives and idles so much smoother
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#22 User is offline   slipstream444 

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Posted 25 April 2009 - 11:33 AM

TreyDM is correct.
The low speed bucking is due to the fact the S2000 is not designed to be lugged around at low speeds - part of that is ECU mapping and part of that is due to the cam profile. The low cam is still relatively aggressive compared to more tame street cars and if you get caught in slow traffic, you can experience some cam surge.
Everyone already seems to instinctively know how to solve this - push in the clutch and feather it occasionally to dampen out the surge.
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#23 User is offline   dparm 

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Posted 25 April 2009 - 06:33 PM

You can clean the MAP sensor if you're certain that's what it is. Likely won't hurt anything.

Go buy a can of electronics cleaner at any auto parts store. Spray the sensor a few times. That's it.
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#24 User is offline   pputkowski 

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Posted 26 April 2009 - 10:32 AM

Do you have an intake? Could be heatsoak...

Happens every now and then with my FIPK after the car is hot.
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Posted 26 April 2009 - 02:47 PM

happened to me too. bought new map sensor with the zip tie and i still get the violent jerking in first gear sometimes. usually happens when the engines been warm for a while and its hot out and im idling for a small period like in traffic
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