I just built my lsv and i got it running but it runs like ish...it idles real low and wants to die but when you throttle up a little it runs semi smooth. I pulled the plugs out and they were carboned up BAD! took the throttle body off and re-cleaned and reinstalled, pulled the iac off inspected and reinstalled but runs the same...dizzy is all the way on one side and thats the smoothest it will idle...all the timing marks are still lined up. I did a valve adjustment to get it running...

Im running a blox IM, thermal gasket, the evap is plugged in but hanging off to the side(chipped p28) b18a1 bottom end, b16a2 head with stock cams and cam gears,

does this sound like an IAC problem or just a big vacuum leak possibly at the IM gasket???

HELP

 

Yes, if your IAC is not reading airflow like it should be. Also make sure your MAP sensor is functioning correctly, along with your primary 02.

 

(chipped P28) no o2...how can you test the iac???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by swapped95 &raquo;</TD></TR><TR><TD CLASS="quote">(chipped P28) no o2...how can you test the iac???</TD></TR></TABLE>

Well you have to understand the role that the IACv plays in the use of a motor. If your IACv is plugged in, but not hooked up and reading airflow, your computer wont get the correct readings of how much fuel to put in for an idle, which would explain why your getting foul plugs, prob from all the gas getting dumped in on them.

Ive been there with manifold issues, trust me. Get the IACv hooked up correctly.
Are you throwing any CEL codes? (besides the IACv)

 

not throwing any codes...i was just curious bout the iac...

and ive come to the conclusion i have a badass vacuum leak from the hose that runs from the im to the breather box on the back of the engine...the fitting goin in is a lil cockeyed and i took the hose off and plugged it with my finger and it idled right up to normal...still have timing issues imma work on when i get the vacuum right...

thanks for your help...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by swapped95 &raquo;</TD></TR><TR><TD CLASS="quote">not throwing any codes...i was just curious bout the iac...

and ive come to the conclusion i have a badass vacuum leak from the hose that runs from the im to the breather box on the back of the engine...the fitting goin in is a lil cockeyed and i took the hose off and plugged it with my finger and it idled right up to normal...still have timing issues imma work on when i get the vacuum right...

thanks for your help...</TD></TR></TABLE>

Np, yes a bad vaccum leak will also cause a bad idle.

 

Tuned? If not, I suggest doing so.
Sounds like you're getting waay too much fuel for some reason, so you have to advance the timing all the way to compensate for it?
A bad vacuum leak will cause your idle to go up and down, but no idle like "ish" or foul out plugs or idle low.
Do you still have your fast idle thermal valve, FITV? It might be stuck open/closed and causing idle issues like they are notorious to do....

 

Im pretty sure my car doesnt have a "fitv"...obd2...b16a2 only the block i obd1...

 

then tune it

 

chipped p28...something is wrong...not just to tune it...

 

ttt

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by swapped95 &raquo;</TD></TR><TR><TD CLASS="quote">chipped p28...something is wrong...not just to tune it...</TD></TR></TABLE>
ya that something is you're running a generic fuel/timing map.
or get a wideband hooked up and see where your AFR's are at, if you're fouling out plugs and can't hold idle I'm gonna venture and say you're running rich and in need of a proper tune, not a generic chip.

 

the reason its rich is because the fpr is VACUUM controled and my vacuum is f'ed up....nothing wrong with the chip or ecu, it ran my b16 for 2 years...NOTHING wrong with chip or ecu...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by swapped95 &raquo;</TD></TR><TR><TD CLASS="quote">the reason its rich is because the fpr is VACUUM controled and my vacuum is f'ed up....nothing wrong with the chip or ecu, it ran my b16 for 2 years...NOTHING wrong with chip or ecu...</TD></TR></TABLE>

was it chipped for this motor specifically?? I wouldnt be running another motors basemap purely on the fact that the mods are similar like alot of idiots do out there...

b16's and lsv's are different... Someone gave me an ecu like it would work with my setup and it ran like ****.

 

Good point but...that wouldnt explain the vacuum being really really high...causing the fpr to dump lots of fuel...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by swapped95 &raquo;</TD></TR><TR><TD CLASS="quote">Good point but...that wouldnt explain the vacuum being really really high...causing the fpr to dump lots of fuel...</TD></TR></TABLE>

also true... but thats just two things too look at.. We tryed messing with mine on crome and it was absolutely useless... couldnt even adjust the idle... parly because I had a leak as well...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by swapped95 &raquo;</TD></TR><TR><TD CLASS="quote">Good point but...that wouldnt explain the vacuum being really really high...causing the fpr to dump lots of fuel...</TD></TR></TABLE>
Bingo
You basically solved your own problem, lol.
Double check all the hoses, even spray some soapy water on if you have to, to locate that leak.

Also, make sure your manifold is properly tightened to the head. You would be surprised how many people run into vaccum issues that are caused from a manifold not being tightend down all the way.

 

What basemap are you using?

if you need, i have a LSV tune, my tune, great idle, basic b18b with b16 or gsr head. tuned to roughly 13.4 afr at WOT. so its not quite a basmap, its better.

 

Why would vacuum be so high? If it was leaking it would be lower wouldnt it?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by swapped95 &raquo;</TD></TR><TR><TD CLASS="quote">the reason its rich is because the fpr is VACUUM controled and my vacuum is f'ed up....nothing wrong with the chip or ecu, it ran my b16 for 2 years...NOTHING wrong with chip or ecu...</TD></TR></TABLE>
haha ya b/c everyone knows a b16 and an ls-vtec setup use the same maps
tuning&gt;generic chip
I missed you're post about the vacuum leak issue, but if you found out where it's leaking from why not fix that and go from there?
Depending on where the leak is coming from will determine how it idles...most of the time it's going to cause a spuratic idle where it goes up and down and sounds like your timing is messed up (which you've also said is an issue).
I'd start by fixing the leak and see if that solves this issue, then get your car tuned and see how it really runs. If you think it runs good off a b16 chip you'll be shocked what a good tune will do. Goodluck

 

i remember doing a lsv for someone and it idled low cause it didnt have a pcv. i used a 97 ls block with b16 head. 97 blocks dont have black canister on back. but when i did plug in a pcv and just let it hang loose, car idled fine

 

i have a b18a1, it has the breather box on the block

 

double and triple check the bolts on your intake manifold.. This was an issue i had with my car...

My builder supposedly torqued them down good....PFFFTTT my ***!, just make sure thats cool...

 

When i got the blox manifold i also bought the thermal intake mani gasket...anyone know the torque specs for this gasket? are they the same?

 

ttt