Idling problems on B16a after porting

[arturo]

guys...really need yr advise here.

my idling not stable.its stuck at about 2k rpm(warm engine) and if i set the idle down lower, the engine will idle like a hi-cam. auto-choke and throttle body aredy changed 3 units still cant idle normally. ori TB also cleaned and all vaccum hoses checked - no leaks. when he close the auto-choke(air in-outlet) then idle will go down to about 1.1k but when on aircon will drop to about 200rpm(engine at normal running temp) if cold start on aircon, engine will straight die off. tried retarding the dizzy to the max, then idle(on n off aircon) will be normal at about 900rpm. problem is if retard to the max, then totally no power. anybody has any idea whats the problem? before did the porting n top overhaul never had this problem...issit cos aredy done porting thats y A/F setting all gone? another question...is it normal to have a little hissing sound at idle after porting? something like air being sucked type of sound...

 

[dcloo]

get an management will help you out causse your car could run too rich/lean AF ratio

 

[arturo]

DC...only a small PnP can cause so much difference in the A/F mixture? engine is all stock. except for the porting done...

 

[kenzo]

air being suck kinda sound when idling? your vacuum hoses might be leaking somewhere since its idling at 2k rpm

 

[arturo]

air being suck kinda sound when idling? your vacuum hoses might be leaking somewhere since its idling at 2k rpm

yah thats wat i tot so too...but the mech said is normal after porting...is it true?

 

[dcloo]

yah thats wat i tot so too...but the mech said is normal after porting...is it true?

if you have any any model AFC around you can install and test it sure its will settle your problem or your ECU was chipped you can try others chip its might be help also

 

[arturo]

ECU is still standard woor...i was told that porting would not require any piggyback or standalone management to control since the A/F still within the standard ECU range. i kena conned issit? there's no way i can afford standalone or even a VAFC now...repair costs so far aredy estimated at about 1.5k....

die la...my FC without tuning sure will kill me

 

[Izso]

what porting was done?

 

[arturo]

head porting...he said only less than 1mm of material was taken off...

 

[Izso]

head porting...he said only less than 1mm of material was taken off...

Ok it sounds like a terminology thing here.. 1mm of material - er.. you talking about skimming the head? Or the intake ports / exhaust ports?

 

[arturo]

urrrm...not skimming(by skimming u mean flatten the surface where they put the gasket?)

wat he did is enlarge the intake and outlet ports(the guy says to make it breathe easier) - port n polish rite?

sorry ya...my first endeavor into engine modding...before this oni mod small stuff hehehe.

 

[Izso]

urrrm...not skimming(by skimming u mean flatten the surface where they put the gasket?)

wat he did is enlarge the intake and outlet ports(the guy says to make it breathe easier) - port n polish rite?

sorry ya...my first endeavor into engine modding...before this oni mod small stuff hehehe.

Oooh.. PNP. Yup yup.. I don't think incorrectly done PNP will affect your idling. But if you have a leak somewhere I'm quite sure that will. Can you identify where the hissing sound is coming from? A faulty gasket or a loose pipe?

---------- Post added at 04:07 PM ---------- 6 hour anti-bump limit - Previous post was at 04:05 PM ----------

Oh btw, does honda have a FICD? Perhaps yours rosak and need a new one

 

[arturo]

FICD...to control aircon on idling n cold starts rite?

b16a use a thermostat type valve that checks the water temp+ cutoff when aircon turns on. the guy called it an autochoke...dunno whats the right name tho. he said he changed 3 different units but still same problem...

anybody done pnp on b16a before? will there be a hissing sound since higher volume of air being sucked in? quite hard to trace the hissing sound. i tried that day n almost burned my face on the hot intake manifold...engine noise + the heat really making it hard to trace...but my mech mati mati say is normal for a pnp engine to have that sound...

 

[arrowhead]

honda doesnt have ficd.

this calls for.... HONDATA.....

 

[Izso]

honda doesnt have ficd.

this calls for.... HONDATA.....

Sifu honda finally in! Just want to ask though, why would PNP affect the idling in a b16a? Too much air? Non-adaptive ECU? Anything that can be manually adjusted? Or perhaps ECU reflashed?

 

[JINEIL2EN]

Sifu honda finally in! Just want to ask though, why would PNP affect the idling in a b16a? Too much air? Non-adaptive ECU? Anything that can be manually adjusted? Or perhaps ECU reflashed?

just PNP without change throttle..??

 

[arturo]

jin...wat u mean?

 

[arrowhead]

izso : u mistook me for someone else?

the sifu's are dcloo, jin, hattech-v, shiro, d-iv, e-tech, ad_eg...

im just a potato with his personal b16a problems... HAHAHAHA...

but honestly, i dont know. it make sens what dcloo said, that after porting, your engine does take in more air, thus creating havoc on the a/f ratio... (more air than normal ma?) but then TB and intake never port (right?)... *shrugs*

as for idling, i always point towards IACV (idle valve) or TPS sensor. most ppl dont disturb their tps sensor (unlike me) so probably u can rule it out...

 

[JINEIL2EN]

jin...wat u mean?

i mean, sometimes... after pnp, but still using the stock throttle body...

 

[arturo]

arrowhead...no need so modest. kenot hide 1 ler heheheh. i was also thinking of that. thats y i asked the mech is it cos the ECU cant adapt to the additional air but he said he's done this on 3 other b16a without problems... one question tho...the milling machine they use should be an 8 axis cnc router rite? if the company that does the milling regularly should have the axis all stored and all pnp should be exactly the same correct? i'm damned worried the pnp went totally wrong...if oni i heard about ad-eg's shop after my car went kaput n had to send the car into this shop...

Jin...TB still stock standard. whole engine is stock standard other than the fact its head is pnp-ed. will have problem ar if use back stock TB?

if by this friday he still cant find the solution i think i'm pulling the car out n sending it to ad_eg...