Ok as some of you may already know I have a 92 civic vx w/ a LS B20b. The car has been idling rough when first started since the swap was done, so today we noticed that the timing was advanced all the way and the fuel press was way high. We adjusted the timing back some and tried to turn the B&M press. reg. down but it wasn't responding, I was told this can be a common problem w/ them, so we removed it and noticed that the O ring was missing, wasn't sure why this thing hadn't been leaking, but anyways we replaced it with a stock GSR press. reg. The car seems to be running alittle stronger now, but here's the problem when I go to stop the idle is fine but as i'm sittin there it starts flux. up and down from like 800-1000, 1000 is where we tried to set it and I noticed tonight the same problem was a little worse it was going from like 500- 900 at some times. Can't figure it out, any help would be GREATLY APPRECIATED.

 

im not sure but maybe check your vacuum hoses? Also check the Idle control valve or whatever it's called

 

pvc valve, on top of intake manifold where it meets the head, bout 4 bucks to replace at autozone/advanced

 

TRY CHECKING YOUR MAS AND MAP SENSORS

 

check the air idle control valve and the pvc, more than likely is the air idle control valve behind the intake man.

 

if it only does it when the car is cold its most likely your fast idel thermo valve ..but if it does it when its warm too it could be a dirty iacv

 

i had a problem wiht my engine idleing wrond and i had to replace my my carberater granted it was an 88 accord but that solved my problem

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blackcivic95 &raquo;</TD></TR><TR><TD CLASS="quote">pvc valve, on top of intake manifold where it meets the head, bout 4 bucks to replace at autozone/advanced</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91lsvtecrx &raquo;</TD></TR><TR><TD CLASS="quote">check the air idle control valve and the pvc , more than likely is the air idle control valve behind the intake man.</TD></TR></TABLE>

so we got two people saying replace teh PVC ok wat is a pvc?
im being a smartass plz dont reply to this

 

what am i looking for to tell if the aicv or pcv is bad how will i tell?


Modified by hybrid92b20 at 9:09 AM 2/8/2004

 

with the engine running, quickly and very tightly squeeze the hose to the pcv. it should click

 

I'd take the IACV off the manifold and spray it out it's probobly clogged to hell... don't bother disconnecting the coolant lines... just un-bolt it and spray it out...

I use carb/choke cleaner... ALLEGEDLY you're not supposed to but I've never used anything but and never had a problem.

The pcv like mentioned... to check it you pinch the hose coming out of it going to the intake manifold... you should hear/feel a click...

It's a 4 dollar part though... I'd just replace it.

*edit*
Also check your coolant level... It's most likely not the cause as when it is the idle is usually MORE erratic (1k-2.5k up and down). but it's worth a look.
*/edit*

 

yea, thanks for the info, we also checked the coolant and even flushed the air out to see if there were bubbles in the coolant system, but thanks to everyone's input I'll check the pcv & aicv and see what happens. PEACE