2000 civic Idle problems

I have a 2000 civic SiR, (manual tranny) when i come to a stop my rpms drop
all the way down to like 200rpm when normally they are at around 750 to 850.
they stay down for around 5 sec then gradually come back up. If I don't
watch that they are low when i go to take off and i don't rev it, it sounds
like my lifters are hitting or like a car sounds when you don't give it
enough gas to take off.

If anyone has any suggestions that would be great.. thanks

 

A valve adjustment might solve this problem.

 

I was told that this could be my TPS (throtle position sensor)... is this
likely? and do i have to replace the whole throtle body to replace it or can
you replace just the sensor?

 

Seems i am having a conversation with myself here ... but maybe a benifit
for someone

I took my car into the dealer and they told me that the idle doing this is
normal? How is droping intermittently down to 200 or 300 rpm be normal?
Can't be good for the car can it?

 

My '94 has been doing the same thing ever since it was new. Pattern is
always the same. Starting with a cold engine, it idles high, as it
should. Then idle gradually drops to around 400 RPM as the engine heats
up, and the it starts climbing to around 700 on fully warm engine. Not a
big problem, but it provides fore a few not-so-smooth take-offs (stick
shift) if I don't pay attention to it.

Turning on the headlights (or other large current drain) alleviates the
problem, the Electrical Load Detector detects the higher current draw
and the ECU bumps up idle a tad.

Don't think the low idle causes any damage, though, but I am no expert.

 

Could be. If the TPS isn't working right, the ECU won't know your foot
has left the pedal and that it should get into idle mode. You could try
resetting the ECU and hope that it re-learns the proper TPS
characteristics. On my car ('94 Civic) you reset the ECU by removing the
fuse labeled "backup" (in the fuse box under the hood, not under the
dash) for about 10 seconds.

 

Thanks for the info... I might look into doing that

 

++++++++++++++++++++=

TPS is doubtful, or else you'd be telling us that it's very 'jerky' when
you try to 'crawl' around in first gear, like when looking for a parking
spot.

You haven't told us your mileage, or anything about your service
history. You may need a new PCV, or you coolant is low, or your tach
isn't actually working right. Valve adjustment might be a good guess,
but not without more info. Have you tried running some different fuel
thru it? How about injector cleaner? Do you hear any vacuum leaks under
the hood? How often do you check / change the oil?

Reply to group... 'Curly'

 

Ok.. it has 105 000km on it. Oil changed every 6000km, Coolent is good,
don't think it is my tach cause the car actually feels rough or like it is
idling low.

I don't think the PCV valve has been replaced. I am the second owner of
this car so I am only going by the service history from the dealership.
This may be a dumb thing to say but someone else told me this... The valves
can't be adjusted because they are hydrolic... I don't agree with this
statement, but then again I only have limited knowledge of this type of
stuff.

I normally put in injector cleaner about once a month or so but since this
started I have tried about 5 tanks of Premium gas instead of Regular other
then on my wallet size. ;(

I also dont hear vacuum noises under the hood... but I didn't mention that I
do have a Short Ram air intake. Now this problem was occuring before it
was installed.

thanks

 

Not dumb at all. If you have hydraulic lifters, you don't need to adjust
the valves. However, I am pretty sure you don't have hydraulic lifters.

 

Do any civics have hydraulic lifters? if so which models