piku303

ive searched pretty extensively and found that a lot of people have been having the same problem with civics of all years/trim levals but almost every thread is unfinished, without the car's owner telling about the final solution to the problem. hopefully somebody has fixed their hesitation issue and knows whats up?

here goes...

i just purchased a 2000 honda civic si last week. after about a week of flawless driving, the car started to develop a hesitation/bog (only when warm) between 1k and 3k rpms. it runs kinda rough and definitely lacks power. this is frustrating because when the car is cold it drives great in the low rpm range. once i get to 3k rpms it starts to clear up and runs great all the way to redline. vtec works perfect as well. the car idles smooth as hell around 900 rpms, is this normal? no CEL's or stored codes on the ecu.

i called the previous owner who i deemed to be a very honest guy and he said the car had never done the hesitation i'm describing. i will admit that when i first got the car i was doing a lot of runs wide open and redlining it in the first 3 gears. i dont think he was quite so rough on the car as he babied it. maybe this could have induced the issue.

i tried reseting the ecu and it didn't do jack to help the issue.

the car has 165k miles on it and as far as i know has all the factory sensors.

according to the previous owner the plugs, wires, and dist cap/rotor are almost new.

here is a list i have to go through this friday when im off work

check plugs, wires, rotor/cap
check timing
check for vaccum leaks
check tps
clean IACV
check/clean map sensor(is this possible?)

other things i'm thinking might cause this issue are
o2 sensors
bad fuel filter
fuel pump?
bad/dirty injectors

are there any other things you guys could think of that could be causing my issue?

thanks a bunch

sam

d15bvtechatch

iTrader: (2)

you should solve the problem once you do all you mentioned... then we can go from there.

its not your iacv.
doubt vacuum..
not fuel pump.

invest in a fuel press guage

is your ecu chipped?

FrodeyEJ1

Don't forget the dizzy

piku303

ok so the car is not chipped. something weird though.... i reset the ecu last night and it ran so so. today when i started it up it drove great from cold to warm. i'm keeping my fingers crossed but i think that the ECU reset might have fixed the issue which leads me to believe that the fault, if it does occour again is electronic/sensor related and not mechanically related. how does that logic sound?

btw im going to go through my test list anyways just to do some preventative maintenance on the car.

thanks guys

piku303

d15bvtechatch...im real tight with my mechanic and i think he'd probably be willing to do a fuel pressure test on my car for free. is that why you said fuel pressure gauge? it would seem strange to me though that if fuel pressure was inadequte that the car would run rough from 1-3k but run great at 8k and WOT.

RT_NEWYORK

how about a tune up? guy claims "almost" new

Le Chameau

I have a B16A2 in my 99 SiR, changed just about everything on it. Plugs/Distributor Cap/Rotor/Fuel Filter/All Bearings/VTech Solenoid/Air filter etc.

This engine is known as the torque-less wonder, and if your AC is on, it really lacks low end power. The newer civic SI's have 2.4L engines to address this issue. I bought mine 7 years ago with 60k on it, and it had no low end torque even then.

Its only a little 1.6L engine, you don't get any real power until about 3000 RPM. Out here at Mosport, all the guys with S2000's and ITR's keep the engine between 7000-10000 RPM when racing the track. The engines just don't have any power outside the Vtec range. Mind you, if you plan of pushing the engine above 7000 RPM a lot, have some spare oil in the trunk to top it up.

piku303

i hear that its the torque-less wonder haha. however, it was runnning WAY weaker than normal. oh yeah, i totally figured out that whole VTEC = needing to add oil thing after about a week of VTEC i checked the stick and saw that i was LOW on oil. no harm done though so im glad.

Kaleko

Get your timing checked. I had a similar issue recently. MY car would almost bog down-low and then take off/clear up at 3200rpm.