lilboxx

so i have a 92 civic cx hatch with a d15b7 from a 94 dx last week i went to replace the pcv valve to try to fix the idle problem which was not the case and just made it idle even worse but what i really dont like is after i changed it my gas mileage went down drastically before a tank of gas would last me about 12 days and now im lucky if it lasts 8 any ideas?

dumpedeg16

Then change it back?

milkwasabadidea

what kinda of idle problems are you having?.....

did you replace with OEM pcv?

did you do it correctly?

a lot of things can affect idle

Wrona

bet u used an autozone one

Former User

This^

And when was the last tune up?

lilboxx

the last tune up was 2 months ago the idle fluxuates between 900 and 1500 when its cold or warm when driving it runs great but once i push the clutch in it starts bouncing between 900 and 1500 again its done it since i put the motor in my car

lilboxx

^ lol nope i stay away from autozones stuff never had much last from autozone but it was from advance auto parts

Former User

What did you do?

Remove air intake system and then use your finger to cover the hole inside the TB leading either to the IACV or FITV. Does covering one of these two holes make the idle speed steady and settle down?

lilboxx

when i tuned it up i put ngk v power plugs in and replaced the wires with advance auto parts wires and put the cap and rotor on i will have to try the holes and see if it does anything tomorrow on my day off i did how ever find the write up on here about cleaning the fitv and i have an extra one in my garage so i did that yesterday but havent had the chance to put it on yet

Former User

Do the TB hole tests and also set the ignition timing to spec. Then reset the ECU.

JDM-Punk

im 90% sure he meant crap aftermarket parts in general... get a oem honda one. still wont fix your main problem but then at least you can rule out crap parts

lilboxx

I will do the hole test and let you know what happens i honestly have no idea how to do the timing ive always had my brother do that but i moved 2 hours away from him

Wrona

exactly advanced auto pep boys autozone orileys all have sh*tty generic parts with very little quality i got one from honda for 18 dollars even though its more expensive it will last another 14 years

lilboxx

hey i plugged the hole that was on the lower firewall side of the tb and when i did the car idled down but nothing else happend it didnt spit or act like it was gonna die or anything it just seemed to idle at a lower rpm..... does that mean the iacv is bad?

fleabag

If replacing the PCV caused things to get worse, then that means you have a vacuum leak. If you feel the PCV valve is defective, you can always tests it by pointing your nose up, placing the part that goes into the engine into your mouth (after cleaning) then suck and blow into it. If you can blow but not suck on it, then it's working perfectly, otherwise it's not working right.

However, you need to fix the vacuum leak you have. Typically replacement of the PCV valve making things worse indicates a vacuum leak. Check for damaged/old vacuum hoses, such as the one you use to connect to your PCV valve! Car is 20 years old, those vacuum hoses are likely cracked and damaged.

Former User

No. Clean and adjust the FITV (click FITV link in my signature).

lilboxx

ive got an extra fitv that i used that link on i just havent had the chance to put it on yet i had to go to menards to get new orings for it which will make it extremely fun to put on because the orings just pop right back out of the holes where they're suppose to go

lilboxx

so far it worked i cleaned the fitv and iacv thanks for the help!!