Hey guys.. i'm experiencing a horrible issue that is driving me nuts. My car will not idle down, it's rev's up to about 3200rpms & then drops down to about 1200 & does it agian & again.

obd1 Forged B18a (tuned with crome pro, ran fine for months, engine still in great shape)

1. No CEL
2. Tested TPS and it's fine
3. Cleaned IACV
4.Tested my 2.5bar Motorola map sensor, works fine ( also put the stock map sensor back in place & threw a different fuel map on the ecu for that map sensor -no luck-)
5. Disconnected all unnessesary things from the intake manifold as far as vacume goes, i got down to nothing but the brake vac line & the fpr line. No vacume leaks.

Anyone else have a suggestion b4 i blow the car up coz i'm pissed at it!

*EDIT..

Tested the ECU on another car (ecu is fine)
Checked coolant level ( it's up to par)


Modified by Running925 at 9:23 PM 11/30/2006

 

Take the car to your tuner to review a few things for you.

 

Test for boost leaks. Doesn't mean something hasn't loosened up on you.

How to build a tester: http://vfaq.com/mods/ICtester.html

i shold just add that to my sig cause this question comes up once a month

Could also be temp related

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Laserjock &raquo;</TD></TR><TR><TD CLASS="quote">Test for boost leaks. Doesn't mean something hasn't loosened up on you.

How to build a tester: http://vfaq.com/mods/ICtester.html

i shold just add that to my sig cause this question comes up once a month

Could also be temp related</TD></TR></TABLE>

Boost leaks woudn't cause an idle like this.. it's in vacume, the car is supposed to be idleing

& Temps are normal.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mtber &raquo;</TD></TR><TR><TD CLASS="quote">Take the car to your tuner to review a few things for you. </TD></TR></TABLE>

I am the turner (CromePro, car ran fine all summer)

 

If you got a boost leak, you have a vaccum leak and vice versa. In my case, I had the same idle surge (sounded like the car was taking a ****) ~3000 to ~700. I left a piece of throttle body gasket when installing a Y8 IM.

Cleaned it off an no more idle surge.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Running925 &raquo;</TD></TR><TR><TD CLASS="quote">

Boost leaks woudn't cause an idle like this.. it's in vacume, the car is supposed to be idleing

& Temps are normal.

I am the turner (CromePro, car ran fine all summer)</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Laserjock &raquo;</TD></TR><TR><TD CLASS="quote">If you got a boost leak, you have a vaccum leak and vice versa. In my case, I had the same idle surge (sounded like the car was taking a ****) ~3000 to ~700. I left a piece of throttle body gasket when installing a Y8 IM.

Cleaned it off an no more idle surge.

</TD></TR></TABLE>

Look! The only way a boost leak could be related to this would be between the tb gasket or the IM gasket.. both are in perfect condition & have not been messed with. This motor has been running fine for 3000 miles! It's something mechanical, i just haven't figured out what yet. Please stop refering to boost leaks as i don't have any and they are irrelivant to my situation at this point.

 

The FITV on the bottom of the throttle body. There's a plate on the back side of it, two screws with 8mm heads. Unscrew those and remove the plate. There's a white round thing with a flat spot on each side of it. Get a flat head screwdriver and turn the outer white ring clockwise until it stops. That's probably it anyways, happens pretty often in hondas, especially when it starts to get cold.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">The FITV on the bottom of the throttle body. There's a plate on the back side of it, two screws with 8mm heads. Unscrew those and remove the plate. There's a white round thing with a flat spot on each side of it. Get a flat head screwdriver and turn the outer white ring clockwise until it stops. That's probably it anyways, happens pretty often in hondas, especially when it starts to get cold.</TD></TR></TABLE>


hahah, exactly, i was about to write this...... either do what the man said, or you can make a block off plate and get rid of that headache....

"its a boost leak" BS hahah

 

thanks guys, i'll mess with it tonight when i get home from work.

Would there be any negitive effects of fabing up a block off plate for that or no?
Whats it's real job?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Running925 &raquo;</TD></TR><TR><TD CLASS="quote">thanks guys, i'll mess with it tonight when i get home from work.

Would there be any negitive effects of fabing up a block off plate for that or no?
Whats it's real job?</TD></TR></TABLE>

no negative effect. the older cars came without the fitv on the tb, it was located on the manifold(still a headache though), and the newer 96+ dont have it at all.

block it off

 

Can the IACV go bad?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by scartail &raquo;</TD></TR><TR><TD CLASS="quote">Can the IACV go bad?</TD></TR></TABLE>yes but usually cleaning it fixes it if it was the problem


My car just started doing this and it was the FITV, do what tony1 said, he pwns

 

All fixed up guys, that did the trick.. the white peice was actually 100% unthreaded! I'll probably make a block off plate when i pull the motor to clean things up for this comming season.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Running925 &raquo;</TD></TR><TR><TD CLASS="quote">All fixed up guys, that did the trick.. the white peice was actually 100% unthreaded! I'll probably make a block off plate when i pull the motor to clean things up for this comming season.</TD></TR></TABLE>


so it totally came off? you just screwed it back in?

 

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


so it totally came off? you just screwed it back in?</TD></TR></TABLE>

correct

 

for Tony1

i usually block off the FITV on most of the cars i work on

 

In the future, easy test is to put your finger over the hole in the TB by the throttle plate that feeds the FITV.

If it idles normal after that, then the FITV is the problem.