5thGeneration

ok so lately my car has been idleing at very low rpm's.

when i start my car it it wll idle at around 2k then will go down to almost 200, when i drive for a sec then stop it will fluctuate between 200-500.

is this normal maybe because of the weather? i have looked at the coolent and nothing is leaking. i know there is some kind of sensor that controls the idle but do not know what or where it is located.
thank you in advance

dudenalude

Does it idle fine when cold & when the h22 is warmed up at normal operating temperature it begins to idle erratically or just idle low? Has it cut off on you or bog out when your in neutral say at a stoplight or stop sign? Could be your "tps" sensor - throttle position sensor or "iac" valve - idle air control valve or even "map sensor". Hope this helps I had the same sorta problem with my prelude in the past. Ended up being my tps sensor.

5thGeneration

it just idles really low. sometimes when i am sittig at a ligt for awhile it will start to sound like it is going to cut out but then just revs back up to about 500. that is the fluctuating i am speaking of. how will i know if one of these are bad?

thanks

vlang29

check the voltageat the TPS. it should read .45-.50 Volts at Closed Throttle, and 4.5-5.0 Volts at WOT

jdmlude5

my 4th gen does the same thing i have been trying to figure that crap out for like a year.i have checked everything tps,iac,map and replaced the ecu. it sucks. if u figure it out tell me what u did. and ill do the same.. i am starting to think it might be my vafc.

5thGeneration

ok. i dont have a volt meter and i didnt really understand what you just instructed me to do....

vlang29

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 5thGeneration &raquo;</TD></TR><TR><TD CLASS="quote">ok. i dont have a volt meter and i didnt really understand what you just instructed me to do.... </TD></TR></TABLE>

1). Buy a Volt meter
2). Turn ignition switch on (do not start engine)
3). Black volt meter probe to ground.
4). Red volt meter probe to the middle terminal on the TPS. You can either stick a paper clip into the harness, or use a knive to nick some insulation off the middle wire. (wrap with elec tape when done) I can't remember what color the wire is, but it is the one in the middle.
5). Look at the volt meter when throttle is closed (idle). The voltage should be .45-.5 volts.
6). Open the throttle to wide open. Look at volt meter. It should read 4.5-5 Volts.
7). If the voltages are correct, you do not have a problem with your TPS.
8). If voltages are no where near these specified voltages, replace TPS.
9). If voltages are close, TPS can be rotated slightly to correct the voltage.

Hope this helps

jdmlude5

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 5thGeneration &raquo;</TD></TR><TR><TD CLASS="quote">ok. i dont have a volt meter and i didnt really understand what you just instructed me to do.... </TD></TR></TABLE>

well because i did not instruct u to do anything besides let me no if u narrow the problem.

5thGeneration

thank you vlang29 i ill be doing this within the next week hopefully and i wil get back to you ad let you know if that is the problem or not.
i only have one question where is the TPS located?

and to you jdmlude i wasent even talking to you so whatever go somewhere. cus you obviously dont know how to correct the problem so you are not needed here.

vlang29

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 5thGeneration &raquo;</TD></TR><TR><TD CLASS="quote">thank you vlang29 i ill be doing this within the next week hopefully and i wil get back to you ad let you know if that is the problem or not.
i only have one question where is the TPS located? </TD></TR></TABLE>


TPS is the little black sensor on side of the throttle body. (side facing firewall)

5thGeneration

for one how am i being a gangster...? i havent really said anything besides expletive off.
two i am trying to learn that is why i am here. why do you have to go and be a dick because you more then likely no more then me? i am not ashamed about not knowing where the TPS sensor was thats why i asked the question. thank god there arent as many ******** on ht like you. peace

whisperingscreamer

Hey man, did that work or not? Mine is effin' up too.

mattsnooz

You two wanna b*tch at each other, go exchange phone numbers and do it over the phone. Keep your comments here (Honda-Tech) about the subject and not of a personal nature and we can all maybe learn something other than how to swear and cuss at each other in dumb and demeaning/primitive manors.

And by the way to the guy who told the man to "nick" the insulation off his Tps sensor wire<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vlang29 &raquo;</TD></TR><TR><TD CLASS="quote">
1 4). Red volt meter probe to the middle terminal on the TPS. You can either stick a paper clip into the harness, or use a knive to nick some insulation off the middle wire. (wrap with elec tape when done) I can't remember what color the wire is, but it is the one in the middle.
</TD></TR></TABLE>, Please don't instruct others to do somewhat stupid things that potentially are damaging to their cars. Then he nicks the wire aswell and due to less cross sectional area of the wire, its resistance goes up and therefor gives a different reading to the ecu. Or what if he nicks two and create a short. It would be best to just use zero resistance jumper wires and measure off them.

gabrielude

if you cant fix the proble, try a temporary fix, unplugg the TPS after u warm up ur car, it would run normal until you replace the TPS, thats how my car is runing but im about to replace the TPS. hope it helps, it worked for me,.

Acidcrakker

My tps is cracked, do you guys think that is the problem. I have issues with cold starts. I put the h23 tb on there and it was fine. I put the old tb on and it still does it.

vlang29

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mattsnooz &raquo;</TD></TR><TR><TD CLASS="quote">And by the way to the guy who told the man to "nick" the insulation off his Tps sensor wire, Please don't instruct others to do somewhat stupid things that potentially are damaging to their cars. Then he nicks the wire aswell and due to less cross sectional area of the wire, its resistance goes up and therefor gives a different reading to the ecu. Or what if he nicks two and create a short. It would be best to just use zero resistance jumper wires and measure off them.</TD></TR></TABLE>

My apologies, i guess i just thought common sense would take over in such a situation. then again, i'm an electrician so what's common sense to me, might not be to others. sorry

whisperingscreamer

Figured mine out.
I have a Hondata ECU, the basic map for fuel trim that it supplys for the Prelude was wrong. It reads:
Stock Fuel Injectors : 310cc
Current Fuel Injectors : 450cc

I'm not sure what the exact size of stock fuel injectors are for a JDM H22, but I changed it to 310, and it didn't run right when the VTEC kicked in. Started to jerk. Not good. So I did some research, and the closest thing I found was 340cc. That seemed to help alot. Still isn't running right, but it's damn close.

SFI : 310cc
CFI : 340cc

whisperingscreamer

Nope. 340 was too rich. Sucks, I can either get it lean or rich, can't find the happy 14.64:1 air/fuel ratio. Fu*kin' GAY!