I did use another MAP sensor from a Civic Si 99-00. Same part #. Car has been running great until up to a couple days ago. I don't have the low throttle bucking like I use to but the hesitation while driving re-surfaced a lil bit. I'm starting to think myself if this is some sort of heat soak problem. The injectors does sound like an idea but I know I have rarely seen injectors be bad.

 

I am experiencing very similar issues. Already brought it to the dealer who, surprise surprise, said nothing was wrong. I may have to write customer service.

 

Hesitant to reply here, as this thread is near death. But I don't see what the big deal is? I can make any manual trans car buck at low RPM. The S2000 does it just the same. It can be overcome with driver technique, in my experience. It's not torque - I could make my old 6-speed C5 do it too. I can make a manual pickup truck do it. I can make my old TDI VW do it. I believe it is something with engine braking (high compression might be more susceptible), driveline lash, and very small throttle inputs with high variability. Next time it happens pay very very close attention to your foot on the gas, I suspect you might sense it wavering a little in cycle with the bucking.

I removed my airbox lid once, and thought it sounded like a tractor and had worse throttle response. I put it back on quickly. I don't see how it can have any effect on 'bucking'.

As for left turns in front of oncoming traffic - in any manual trans car I allow plenty of revs to minimize risk of bog or a clutch slip and killed engine. Try doing that in a car with aggressive traction control, where the computer pulls the throttle back for you as you see traffic coming at you through the right side window. Scary.

 

Giving that dead horse just one more kick but .................

 

Xviper is absolutely right, and here's why:

The "Bucking" happened to me on a hot day this past month in rush hour traffic. My first thought was, "There's no way I'm doing this". It happened over and over again while crawling through rush hour traffic on the Dan Ryan in Chicago (a very familiar place for our vehicle). I had previously taken the slack out of the throttle cable that was suggested earler.

Then I tried pressing my right foot really hard against the carpet on the right side, trying to use the carpet as a "friction pad" so that my foot wouldn't see-saw back-and-forth with the rest of my body. Eureka! Problem solved!! I went back to feather-footing it, and it bucks again. Push my foot against the carpet, it goes away.

Here's the problem as I see it. High temps and heat soak make this car very susceptible to bucking. When you press on the gas, you get a "surge" which causes your entire foot to go forward ever-so-sligtly. When you let go, your body pulls back along with your leg. You end up in a do-loop of bucking.

If you put enough friction in there to prevent your body's momentum from having an impact, the problem goes away. I dont care how arrogant you are and how much you want to blame your car and deny any input to the problem, you do have an input to the problem.

 

is this tsb listed on owners link?

 

isn't this called kangarooing & is elimated w/ a cai?

 

Has anybody experienced this bucking after first starting their cars in the morning? When I first start the car, the RPMS go up to about 2k then drops down to where the car shudders then goes back up to normal idle

 

Next time you start your car in the morning try this technique.

Instead of leaving your foot off the gas pedal completely after turning over the ignition, blip the throttle gently and quickly then leave your foot off of the gas pedal.

You may need to modulate the throttle couple of times in order to keep the rpm from dropping below idle point.

 

I eliminated both the bucking and the heat-induced bogging by installing an AEM CAI.