i have a 2000 civic si with a aem short ram intake,dc 4-1 header, and exhaust, I bought it with these items and often find the engine to sputter at low rpm's and idle back and forth rapidly between 1100 and 1400 rpm, and then when i am driving really slow(down driveway) it jolts around. i changed the cap and rotor and used some injector cleaner, but no good. does someone know what i can do?

 

any codes? how many miles you have? have you change plugs, wires? maybe your iacv or fitv is bad/dirty/loose.

 

36k, i don't know about codes, i changed the plugs and what are the other things you mentioned?

 

eacv and fast idle valve in the picture.

 

is the check enigne light on?

Did you reconnect the O2 sensors?

when you installed the intake did you put back the PCV hoses?

Vac Leak?

 

i would also check things like.....ign coil...my car had some similar probs and the ign coil took a crap...after replacing...it went away...
my .02

 

maybe a vacuum leak?

 

plug wires or vacuum leak i'd say

 

If you tried all the above suggestions,you could also try and reset the ECU.Probably won't do anything but its worth a try.Good Luck man.

 

Your throttle cable may be a bit to tight...i had this problem and it turned out to be my throttle cable.

 

Does it ever idle below the numbers you gave us? Is your car auto or manual?

 

didn't the 99-00 si's only come in manual? ... i would check for vac. leaks/ take off your intake and see if the throttle body is dirty...

 

throttle body, spark plug wires, throttle cable, and vac leaks. what is more likely

 

sounds like a vacuum leak to me

 

on 99-00 si's theres theres a vacum port on the back of the Intake manifold that leads to cruise control i think. they are known to leak and cause a flucuation idle id check that out first. also check the iacv and clean it out.

 

I'd say the best thing you can do for your car is buy the haynes manual for it.

Don't just start throwing parts at the car.

Buy your manual and diagnois[sp] the problem.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbocoupe97 &raquo;</TD></TR><TR><TD CLASS="quote">sounds like a vacuum leak to me</TD></TR></TABLE>

exactly what came to my mind
Peace

 

clean out your throttle body.
you could have a dirty sensor.
if that doesnt work... spray carb cleaner around the vacuum hoses, and intake manifold, if your engine starts to choke or any diffrence at all where you sprayed, your getting a vaccum leak form there..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IVI &raquo;</TD></TR><TR><TD CLASS="quote">clean out your throttle body.
you could have a dirty sensor.
if that doesnt work... spray carb cleaner around the vacuum hoses, and intake manifold, if your engine starts to choke or any diffrence at all where you sprayed, your getting a vaccum leak form there..</TD></TR></TABLE>
i never thought of that before! i always did the soap and water trick.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Benjithx &raquo;</TD></TR><TR><TD CLASS="quote"> low rpm's and idle back and forth rapidly between 1100 and 1400 rpm, and then when i am driving really slow(down driveway) it jolts around. </TD></TR></TABLE>

Does it only do this in low rpm, like the engine can't decide where to keep it's idle so it;s going back and forth eh ?

There are a few different reasons it might do this but most common that i've seen i would say would be a vacuum leek, bad IACV, or bad TPS.

*IACV = idle air control valve.
*TPS = throttle position sensor.

But if you say you got no codes, or no check engine light most likely it would be a vacuum, id say.

 

reset your ECU. i know on the 92-95s and integra's ive added parts like exhaust, intake, header, and if u don;t reset the ECU then it runs kindove bad in the lower RPM's my teg would even sometimes stall because of a faulty o2 senor reading.

warm the car up, reset ECU, and allow the car to re adjust its self.

 

I just wanted to thank everyone for quick responce and fix. It turned out to be the cruise control vac. tube. I never even saw the thing but just like the badasses you guys are i just slid that bad boy back on and and everything is back to perfect. It runs **** and has a smooth low rpm idle. YOU GUYS ARE THE BEST!!!

...beers are on me tonight boys

 

your welcome. ill have some budweiser, im dying for a drink right now. im freaking out literally, im dying of boredom.

 

told you.so

 

glad we ALL could help