h23 throttle body/plenum problem

[dj_eclipse_303]

hi ppl i have a bit problem here with the h23 upper manifold...i swap h23 throttle body and plenum but then i hardly can turn on the car sometimes and the idle is rough.. i don't see any house loose the rpm's go from 1k to 3k or stays on 1k to 2k lol its crazy also is running rich..

*what can i do or look at cuz i am out of ideas
can somebody help here please!

[bmxfelon420]

did you adjust the TPS?

[dj_eclipse_303]

not yet im trying to stop the jumping rpm's and i don't think that has anything to do ... i think

-i clean up the air control valve * that the one in front with a connector right?

-block off the other one next to it small valve don't know the name
-block off the one underneath the TB

[F20A CB7]

im having idle issues also since i did my h23 plenum swap.


i tightened the fitv still bounced, icav still jumped, and the thingy on the far right of the plenum, i left uncapped, if i cap it the idle will surge, and i replaced it already with a f22a 1.

now if im at high rpms, and put in N, the rpms drop wayyy low to 200 300 rpm and the car cuts off.

[dj_eclipse_303]

i switch back to the p06 and the rpm are way low almost to die and run rich burning gas like crazy lol put back the stock ecu idle at 700 but sometimes start to jump lol this is crazy im missing something but don't know what

[chrischhorn]

rpm surge sounds like a vac leak.....I assume you used a new gasket? If so, did you clean the mounting surfaces very well and was sure to scrape off all the old gasket? Did you use a new gasket between the throttle body and plenum? Cap off all your extra vacuum ports if any?

[dj_eclipse_303]

all gaskets are new from head side to upper plenum and TB still the same... could be i block off the valve underneath the TB? what can do with the rich problem

[dj_eclipse_303]

well at least car starts up and runs... rich is but runs hard to star cold and hesitates at 4k what can be wrong adjusted the tps.

[chrischhorn]

no CELs? BTW keep the original ecu in the car. Dont run the p06 unless its chipped and you have the f22 basemap on it or something. Fuel curvers are different and blah blah blah. Simply put, use your original ecu. Your car probably hesitates because your car is running so rich. Make sure your FPR vac is connected. Any other mods done to your car?

[Jon]

Did you swap the entire intake manifold (runners, plenum, etc.) or was it just the plenum?

And bmxfelon420 mentioned something that should have been done when you did the swap. Make sure you set your TPS. That was the very first thing I did when I did the swap and it fixed some of the idle issues.

[F20A CB7]

no CELs? BTW keep the original ecu in the car. Dont run the p06 unless its chipped and you have the f22 basemap on it or something. Fuel curvers are different and blah blah blah. Simply put, use your original ecu. Your car probably hesitates because your car is running so rich. Make sure your FPR vac is connected. Any other mods done to your car?

fpr? is that the piece on the far right of the plenum??

is not what is that called.

[Chico Suave]

Also don't forget your idle screw, I had to adjust that on mine to get my car to idle right after I swaped on my H23 intake manifold.

[Jon]

FPR = fuel pressure regulator... I can't think of any other acronym for FPR. And yes it has a vac line attached to it.

[chrischhorn]

fpr? is that the piece on the far right of the plenum??

is not what is that called.

not on the plenum.....on the fuel rail. Your fpr runs off vacuum. If there is no vacuum then it sits at 43 psi when your idle fuel is suppose to be much lower. (not sure of exact at idle) Hence, runnin rich.

[F20A CB7]

cool, how can i test to see if it has vac?


newbii at h23 plenum swap.