I got this car back in October, it drove great until December. I started having problems with high idle, within the week it went from a high idle to a fluctuating idle (800-2000rpm). That weekend i checked the codes and all it said was a misfire cylinder #1, i replaced the wires, plugs, rotor and cap, and #1 injector. The problem did not go away, then is started throwing the IACV code. I cleaned the IACV, didnt help so i replaced it.

--Even with a brand new Denso IACV(same as i took off the car) it is still throwing the IACV code and having the fluctuating idle.

~Is there anything special i needed to do when replacing?


--With the new plugs, wires, cap and rotor,fuel filter, injector in #1 - I am still haveing the misfire problem, i have done a compression check and all cylinders are at 170.

~ Could the IACV problem be fooling the computer to thinking its a misfire?
~ Can the misfire be causing the IACV problem?
~ Maybe the valves sticking?
(sometimes it will throw cylinders 3,4 also but when i reset the ECU they dont always pop back up)
~Maybe the distributor?

Im kinda lost at this point!

:hith ead:: hithead::hithe ad:

70 views and no responces. not looking good......

You posted this in 1973-1995 cars.
I know damn good and well you do not have a 19731995 car.
I didn't even need the crystal ball to see that.

Try again.

Year
make
model
trim
#doors
engine
trans

??

code numbers
freeze frame data

Ok, bear with me im learning more and more abotu this car everyday.

I has a '00 ECU and Intake Manofold but a D15B block with vTec, so im thinking ill repost in 6th Gen since the problems seem to be coming from the parts off the '00

Year - 2000
make - civic
model - Civic
trim - ? all power with sunroof
#doors - 2
engine - D15B - Previous owner swaped. Still has '00 ECU/Intake
trans - Manual

??

code numbers - 14/ 71/ 72/ 73/ 74
freeze frame data - Not sure what this is.

OMFG it's a homesick abortion.
I'd HOPE the engine is a 96 or newer.




I really don't know how much I can help.

2000 Civic coupe EX(? factory sunroof I assume?)
Why on Earth did it get a swap? Was it too hard to find the right engine or something?

On the codes, use decent code reader that gives codes in the standard Pxxxx format for OBD2. Two digit flash codes are too vague.

Code 14 could be any of 3 separate "P" codes, all have different definitions. OBD2 could narrow it down more: P0505 (idle speed high and can't be controlled), P0511, P1519 (circuit codes).

"Freeze Frame" data is like a snapshot of running conditions taken at the time a code set and stored until the codes are erased.
Tells stuff like coolant temperature, RPM, MPH, fuel trims, and a few more things. Invaluable at times.

Ok, idle problems: Start with basics.
Vacuum leaks.
Sticking IAC (what is the real code?)
Vacuum leaks.
Is the radiator full?
Vacuum leaks.
Does it reach operating temperature of 180F in a reasonable time?
Vacuum leaks.
You know how to check for vacuum leaks, right?



Misfire.....
Compression test? 170 seems low to me, but I don't know how you did it.
Valve adjustment? (!!!!)
Does it really have a miss or a misfire?



Is the intake coming loose from the head?






All I can do is SWAG here.

I'd HOPE the engine is a 96 or newer.
Im not for sure but im told its out of a '95



factory sunroof, a/c, c.c./ all power
I was told they already had the d15 when the orig motor blew




Im not seeing the OBD2 plug (i know its under the drivers side)
Maye this is the last OBD1 ECU?


Brand new IACV (better not be sticking)
Radiator is full
Reaches temp fine
I checked all the vacuum lines i could find and they seem to be all intact.



I pulled all plugs and tested one at a time.
My buddy said he can show me how to adjust the valves but he never has time. Is it pretty simle? (Im no mechanic but i do work on all my cars)
Sometimes it seemd like it does have a miss but other times it runs SOOO smooth...


No.

Only have a minute here....

37820-p2p-a12
99 and 2000 Civic 2 and 4 door, EX. M/T

That thing better have an OBD2 plug somewhere.

Use carb spray or flammable brake cleaner to help locate vacuum leaks.

Or smoke. This guy is an idiot, but this is a viable method. [autostream]http://autostream.com/ibcivicforums/?page_type=firebirdplayerthumbnail&framepage=1363& transactionid=1359414311-982224733&posted_by=_www.civicforums.com&youtube_v ideo_id=zMok2y05jNE[/autostream]

I found it, it was stuffed up under the dash, my buddy has a code reader.
Ill get the codes and check for the leaks again tonight after work...


THANK A TON FOR ALL YOUR HELP ! ! !

Yw, gl

You are the man EZONE !!!

I think i found it, intake mani gasket...

Its sucking like a sturgeon, i covered the leaking part with my finger and the idle stopped fluctuating. It seemed a little high still but it could be leaking from other spots on the gasket. Im going to replace it this weekend and hopefully that will be the fix.

The part # on my intake is p2p ipt-4

Engine - d15b VTec

Do you know if all the gaskets are the same or what one i should get?

Yay.

This means nothing to me.
If the cylinder head and intake manifold are still original to the car, just get the gasket for the 2000 engine/car.

If you don't know for certain, you may need to get a gasket and see if it all matches up. Make sure it covers all important areas on the head, then hold it to the manifold and make sure it covers all areas there too.
If the head and intake don't match each other, you are going to have to deal with problems.
(I'd think to google port matching for more ideas on this if necessary.)

HTH