B16A running rough. (NOT IACV)

B16A running rough. (NOT IACV) SORTED!!!!! ;-)

Hi guys god this car is doing my head in, as posted in another tread vtec not kickin in. apart from that the car is running rough , low idle and when open the throttle slightly the car starts hunting (high low idle)

things i have tried .

Checked the wiring for iac thats fine battery voltage and varible earth from ecu .

fitted new IACV NO joy there

cel code still 14

STILL IS BREAKING MY BALLS!!!

John.

 

you could try adjusting the FITV thats how i fixed my fluctuating idle problem, im not sure if its in the same spot as the d series but its under the tb heres a link

*** How-To*** Clean Your FITV aka Fast Idle Thermo Valve - Honda-Tech

 

thanks for link mate , but i have also tried that .

also forgot to mention , when driven the car at low rpm (under 3rpm changin to correct gear ) car starts chuckin like fuck....

 

wow lol that sucks not much else i can think of other than what everyone else says as far as those two valves and maybe vacuum leak somewhere

 

SUCKS for sure man . thanks anyway

 

Checked your ignition timing? check your TPS?

 

my only other suggestion would be to keep looking around or wait till someone comes up with an answer lol you could try the honda-tech forums or if you need it fixed now take it somewhere and see what a mechanic says your choice sucks it couldnt be one of the easy fixes lol

 

if TPS wouldnt it come up on fault code?also what about knock sensor could this cause problem altho again fault code would show that id imagine?


cheers John.

 

I had a similar issue a while back, there is a way to adjust the idle with the ecu electronically not just adjusting it by hand, the helms shows you how.

 

i had a tps go bad but didnt show a code, nvr heard of it happening but it did to me, w no cel on..

 

ok guys ill test the TPS tomorrow . hope too feck something turns up.
car is due for testing thursday..

 

tested the TPS today seems to be working correctly supply 5volts , good earth , also varible voltage 0.5-5volts . KNOCK SENSOR??

 

I am having this exact same problem to the T and have been dealing with it since i got the car.It makes no sense.I changed iacv,then i tore apart my entire harness following the wires,bled air from the cooling system,swapped plugs,checked for vacuum leaks,adjusted idle.nothing has worked.

 

oh ya and its not the ecu cuz i tried changing that

 

oh shite man i thought i was solo on this. tell me more did you do motor swap??? i dont know what my prob is . but i will sort it out IF IT FECKING KILLS ME!! i refuse too let anyonelse look at it now .

 

what model B16 is it?
What Ecu are you running?
any other power adders or modifications?

 

You can also check the FITV (if you have one)

With the motor at a good running temperature, take the intake pipe off and feel the lower hole inside the throttle body (on the outside of the butterfly). If you feel suction and it makes the car idle better, its the FITV.

And you check the wiring on the IACV? Have you tried to unplug the IACV at running temp and see what the idle does? If rpm doesn't go down....the IACV is bad or the wiring for it

 

hey man.

B16A JDM motor from EG2 crx del sol

P30 ECU

no mods.

 

i checked the wiring at IAC there is 2x 12volts ?? also unplugging it makes no diff to Idle . but yet i have tested the iacv for continuity 11ohms and insulation infinity. so it seems the ecu is not sensing electercal loads ther-fore
not supplying an earth for IACV. the car failed its annual test thursday , because emissions could not be checked as the car WOULD NOT hold 2500rpm . i think i may have 2x problems . the engine was running fine before i did the swap , so it is something i have over looked. other sensors i have tested are , TPS and MAP all check out fine

thanks for replying guys.

 

No change in the IACV could be the IACV Helm's says that the idle should fall to about 400rpm or it could even die. If its staying at high idle.....I would look into borrowing one or hitting up a recycler/junkyard for a used one. There's a ton of them out there to try. Sometimes a cleaning isn't enough. It "probably" not the wiring on the IACV because it would throw a code if it was loose. And check the FITV....if you have one.