Rep Power: 0

Hi my '01 civic si is working like you know what and I would really like to get to the bottom of it, sometimes it works fine and other times it acts up. You will be driving down the road and all of a sudden the thing will start bogging out at like 3.5 or 4 rpm and if you keep at the same acceleration it will stay at that rpm but will lose speed/acceleration. Do fix the bogging problem it seems only way is to step on the gas or rev it with the clutch in, and the rpms go up fast and it will work fine for a short while, Any ideas would be great

 
Rep Power: 0

Do you have your check engine light on? Typically a code will be thrown when you have misfire issues. Are you running low octane gas? You could try cleaning the IAC (idle air control valve) to see if that is sticking but if it is hesitating at driving speeds that is probably not the issue. If it is a constant issue i would check the plugs and the gapping on them. If it is an intermittent issue that probably is not the issue either tho. .

 
Rep Power: 0

The engine light is on reading the 02 sensor by the cat, but wouldnt think it would be that seeing hows it doesnt do it all the time, thought it was dirty filter so i bought a new one, and changed plugs, tonight it worked fine no issues besides when it was ideling it started to sputter and motor changed sounds, and im running surpreme in it

 
Rep Power: 297

alson sounds like it could be the trottle position sensor. but that should throw a code.

 
Rep Power: 0

Does not throw a code for that

 
Rep Power: 297

Is it still doing it or did it stop with the filter and plug change.

 
Rep Power: 0

na it still does it, some days it works great other days you have to rev it up and dump it to get it to stop bogging out( did a burn out in tim hortons drive thru )

 
Rep Power: 0

Every TPS i have seen bad seems to have a spike in the revs and they don't go bad too often but anything is possible. My sister actually just had to replace that oxygen sensor at the cat and hers was running like crap on and off. We cleaned it and the light went away for a few weeks but then started causing problems here and there. Soo i would say if the code is for that i would definitely start there. Clean it if you want and reset the computer. If it stays away for a bit, it is probably the culprit; still go ahead and replace it when you can because it will show its' face again down the road. Running it long term with a bad oxygen sensor can cause damage to your cat as well and that will be a pricey fix compared to just that sensor.

 
Rep Power: 0

we will see if thats the problem

 
Rep Power: 0

sorry but i need to bump this for a solution. my mother's been complaining about this issue for the past few months. 01 civic ex, no CEL

it's completely random. the car sometimes won't accelerate while driving. whether you keep the throttle in the same position or go WOT, the RPMs stay the same and does not accelerate. pressing in the clutch or putting it into neutral allows the engine to rev again, but when you put it back into gear the problem is still there. mashing the gas a bunch of times and shifting through the gears a few times is the only way i can seem to correct it. er, it doesn't even correct it, it just goes away as randomly as it started it seems. also it's not like a bucking or anything like a misfire, the engine still runs smooth, just no acceleration or power.

i'm almost positive it happens only during/immediately after gear shifts. you shift into a new gear and all of a sudden the problem is there, whereas a few seconds prior, it was driving fine.

some other things that might lead to a solution. she said during the winter her heater would randomly blow cold air. i haven't seen the car overheat though. also haven't checked coolant level, as i don't think it's the same issue. also, i pulled the air box and saw what might have been and original air filter in there with about 10 years of crap caked into it. i pulled the crap off the filter in one piece, like a soft brick. it was nasty. i figured that was the issue, but the problem seems to be getting worse.

i'm thinking it's intake related and here's why: pressing the gas pedal opens the throttle. more air gets sucked into the intake, the map sensor sees this and the ecu makes a fuel adjustment for a bigger boom. however, what if the throttle opens and something's blocking that airflow, like the crap i found in the air box, and the MAP is still reading a low air pressure. you could have the pedal to the floor but if the MAP doesn't see extra air, your fuel stays the same, and no acceleration. but wouldn't the TPS see the WOT? doesn't the ecu compare the data sent from the TPS and MAP sensor? or do they work separately? if the TPS was bad wouldn't i get a CEL? i know these things work with voltage. is it possible that the TPS might be sending a low, passable signal to the ecu so that even though the throttle is wide open, the TPS thinks you're still only at 25%? i mean, that does kind of make sense and go with the whole shifting gears thing because you let off the throttle completely in between shifts, and the problem starts immediately after a shift.

i'm stumped. anyone have any input on this? no CEL, no misfires, no bucking or stuttering like a fuel pump/ignition problem. all i can think of is either more crap stuck up inside the throttle body, or a TPS issue.