Running rich and no idle when hot

[rs200]

sorry for open the old topic but I have similar problem..
car running too rich on idle (10.80-11.30 AFR) , when car is running they are (12.30- 13.80 AFR) .
I went to look the sparks and they are BLACK .

lamda are new
no air leak
but the sparks are OLD.. can they be a problem?
and there is no fault codes.
thanks

[rs200]

thanks to god than no one have same issue..
if I fix it i will be the first one?

please HELP..

[Thuppu]

I have the same issue with my rebuild, when hot the idle disapear.

[valjo]

Maf ?

[Thuppu]

Yes, I also suspect the MAF.

[prj]

You have a vacuum leak, fix it.
Take soap water and spray on back of ISV, answer should be there...

[Thuppu]

Yeah, I'm going to test that soon...

[rs200]

my maf is new. before few month I take it..
boost leak.. hmmmm... must check it..

[rs200]

today I checked and there is no boost leak..and ISV is prefect..

I thing that sparks or ignition coils are bad..
can POS be half good? or they are good or dead? I still have OEM coils on car..
thanks..

[prj]

Misfire would show lean, not reach on WBO2.
Did you use soap water as well?
I can never hear the leaks from the ISV, but using soap water it bubbles a lot.

[Lighthouse]

Just to inform you, it was my lamdba that was broken. Went like afterwards !

[rs200]

well I use wideband O2 . and they are old few month (maybe 4) , and they shoes a good values on AFR. so I dont thing that lambda is problem..

[Lighthouse]

Is it calibrated?

[prj]

Proper WBO2 controllers do not need calibration.

[rs200]

my spark plugs are dead.. 100%.. I check ISV, with soap and they are perfect.
must change it and than will know.

my WBO2 have self calibration