alright well i have a d15b jspec motor and my idle use to be at 1k but recently its been at 500 i have been told my fuel filter, dizzy and my sparkplug and wires are bad. can those be the problem? i have a CEL of o2 sensor and IAT also but they only go on sometimes like 30 mins after driving but goes off everytime i turn off car and turn it back on. what can be wrong???

 

any1?

 

somoene???

 

upup

 

your CELs might be part of the problem. change the pcv valve, they have the tendency to do this and you can also adjust your idle through a screw on the t/b. but take care of those CELs too.

 

Fix your problems, starting with the O2. Then do a tune-up. Replace everything that's bad.

 

is it still okay to drive ? like is it safe?

 

it is fine to drive. replace whatever cel its throwing and adjust your idle from your idle adjustment screw.

 

maybe your IAT is messed up... or maybe you don't have a cold-start program, could be something with the ECU. That's what happened to my buddy, he has a 92 Si hatch and his idoling was just like what you're sayin'.

whatever it is-- good luck!

 

whats a cold start program? is that in the ecu?

 

yeah, and his wasnt chipped correctly so he didnt have it. had to get his ECU reflashed. we couldnt figure out what the hell was wrong until we stumbled across that.

 

is there anyway to check if the problem is the ecu?

 

is your car running rich AFR at all when you start it/after you start it?

 

fuel filter, distributor and sparkplugs may cause low idle.
There are also 25 other things that can as well.
CEL on will cause low/high idle. (at the top of the list)
Fix your O2 and IAT problems. Both problems will cause the car to run oddly.


BTW, cycling the ignition always resets the ECU in throwing a CEL.
It does not remove the problem, only the ECU knowing about it.

 

I am not sure why you feel it is a problem my 93 si has always idled at 500 rpms after it warms up it never has stalled or shut off at this rpm. I've owned the car for 13 years and have over 210,000 on it So why do you feel its a problem? Is the car shutting off on you?

 

no it never shut off on me but it shakes when it goes down to 500rpm and feels like its goin stall.

 

try cleaning the iacv it is located behind the intake with 2 hoses coming into the bottom and a plug in connector on the one side search on here about it there are a ton of threads on it

 

dizzy

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ph0shizzle &raquo;</TD></TR><TR><TD CLASS="quote">no it never shut off on me but it shakes when it goes down to 500rpm and feels like its goin stall.</TD></TR></TABLE>

i'm tellin you, you dont have a cold-start program on your ECU. maybe you dont have the codes logged. i know its happened to other people. that or the IAC

 

chipped ECUs must have a cold start program.... at least as much as a normal ECU does.

cold start is simple a group of values that decrease or increase the amount of fuel (IAT dependant) when the car is cranking and warming up.
If those values are not set right it will run like crap.

A bad IAT sets these values at their worst case (super rich) and the car will idle f'd up, but it will idle.

Fix your IAT and O2 CEL and the car will run better.

 

well i dont know whats wrong with my IAT and O2 sensor. the o2 sensor all the wires looks like its intact and i just baught a new IAT sensor. what could be wrong with em? should i jus buy a new o2 sensor?

 

My D-series when fully warmed, no accesories on, idles between 500 and 700 rpms. stock ecu. no codes. 94 civic coupe ex abs. check your oil too. Mine was a qt low, added it back and the idle smoothened out.

 

yea my oil level is good. but im not sure whats wrong with my o2 and IAT.

 

if the sensors are known good, then it has to be the wires in between the ECU and the sensors.
dig out your meter and go to work.

 

damn i dont know much bout fixin stuff cept basic things. is there anyshops that can fix it for cheap? or how much u think it would cost. i dont wanna mess anythin up more than how it is already