93civciv

I just recently put a turbo on my b16 and i took it out for a spin and it ran awesome...could not have had a better run around..anyway...towards the end of my second run around my neighborhood....

it was a little hard to get out of neutral with out my car wanting to almost die...it would be close and i would let off the gas and put it in neutral and my cars idle would surge...from like 1000- 1500....

and my normal vacuum is usually at 20 or more but when my idle does that its at 10 and rises to like 5 and comes back...rises..etc....

I changed my pcv valve and it fixed the problem for a little bit but then the idle would do it again but only a few times and then i could drive it again...

could it be a small vacuum leak somewhere??

I have a code 41 coming up and i have tried 3 dif. used o2's but i am going to buy a new one...could this be my prob???

sorry so long...just thought i would get it all out there..

later

ahobbs

so this is not a bog issue it's an idle issue. if that's the case the idle surging is the fast idle under the TB.

93civciv

anything else i can try?

ttt!

T3T495GSR

If it is the Fast idle valve , its not hard to fix.
Its under the throttle body connected with 3 10 mm bolts and a coolant line.
First remove it and then you will notice there is a brass plate on one end of it. It is held on by two 5/16 bolts. Take those off, there is a plastic screw that most likely wiggled loose and it has a spring in between it . Make sure it is all attatched and tighten that plastic screw. Its a Flathead btw. Put it all back together and your idle should be fixed. I fixed mine. It used to idle at 1500 to 3500 up and down forever and it really messes up your driving. Just try and fix it because it is really easy

93civciv

yeah that was my problem back when i did the motor swap....my car only does this after i hit boost for a little bit..then it starts to do that.....thats why i thought it was a vacuum leak somewhere or even air in the coolant system...

93civciv

TTT....

D@nnY

why are you making runs in your nieghborhood?

nsxmatt

What is your setup? What fuel pump and such? Did you let the car warm up or did you just go hammer down on it right after you started it?

93civciv

well right now i do not have any upgrades on the fuel..cept for the fmu...but i do not think that is my problem....i let it run for like 15 mins before i took off...and i can go for awhile just fine and after awhile is when the idle starts

93civciv

big neighborhood....no insurance on the car...gotta play it safe!!

nsxmatt

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93civciv &raquo;</TD></TR><TR><TD CLASS="quote">well right now i do not have any upgrades on the fuel..cept for the fmu...but i do not think that is my problem....i let it run for like 15 mins before i took off...and i can go for awhile just fine and after awhile is when the idle starts</TD></TR></TABLE>

So your running 120psi of line pressure with a stock Civic fuel pump trying to add fuel. Chances are you did damage by getting greedy and wanting to boost around the block before you actually got the car finished.

T3T495GSR

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxmatt &raquo;</TD></TR><TR><TD CLASS="quote">

So your running 120psi of line pressure with a stock Civic fuel pump trying to add fuel. Chances are you did damage by getting greedy and wanting to boost around the block before you actually got the car finished. </TD></TR></TABLE>

Matt knows his ****

boosted k20

i would seriously do a compression check on that motor just to make sure u didnt blow anything.
cant believe people r still using FMU's

93civciv

my motor runs fine...compression is fine....just a lil idle prob...you dont have to make it a big deal..im looking for help not someone out to make me look like an ***....and yes i have an fmu...so what...i have no where to go right now...noone local can tune my car...i have not found anyone to chip and ecu for me and there are so many different engine managements out there i dont know which one to chose...

are you telling me upgrade my stock fuel pump...or could i just put on an inline pump?

93civciv

are you telling me upgrade my stock fuel pump...or could i just put on an inline pump?

SOHC_MShue

i don't really see too much of a problem running a fmu setup as long as he keeps it at 5psi like it sais in his sig. Upgrading the fuel pump would be a good idea though.

93civciv

thanks at least there is someone on here who can believe in FMU's but oh well its in the trash..i just ordered an ecu chipped for my setup and bought a set of 310s

nsxmatt

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93civciv &raquo;</TD></TR><TR><TD CLASS="quote">thanks at least there is someone on here who can believe in FMU's but oh well its in the trash..i just ordered an ecu chipped for my setup and bought a set of 310s </TD></TR></TABLE>

Those 310's will be maxed out before you hit 5 psi, you should have checked before buying more parts. Nothing was wrong with the FMU, I ran one with alot of success but you have to be smart about it and do some research. Type in FMU in the search box and you'll find lots of info. You don't run a FMU without a inline fuel pump. The FMU works off of high line pressure, not lots of volume. A inline pump will provide the pressure where a intank will provide more volume, like in a larger injector and stock regulator type of fuel system. I actually ran both on my FMU setup to be safe and it never gave me problems.

93civciv

so your saying keep the fmu and run an inline pump?

tokesGTR

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93civciv &raquo;</TD></TR><TR><TD CLASS="quote">so your saying keep the fmu and run an inline pump?</TD></TR></TABLE>



He's saying buy some properly sized injectors.

93civciv

anyway to end this whole thing...i was looking for an answer as to why my car was ildeing like that...my title doesnt fit exactly what i was looking for...it was idleing up and down after i would boost and i found that the map sensor code was popping up and putting the ecu into crap mode causing my car to surge...got a missing link and fixed the prob