s90 TB on the jazz

[GU357]

Hey guys put a s90 55mm tb on the jazz. It's pretty much a stock tb that's bores out in the middle and shinier bullet aluminium.

When i started the engine revved to arms 5grand so i turned it off, then re started all good idle was a lol high so adjusted butterfly opening till idle was closer to 800rpm.
And reset the accelerator cable to pick up some slack.

But since installing it this morning Ive noticed a negative impact on performance.
Like it takes longer to bring the revs up they don't really wanna go passed 4500rpm could this be related to the plug that tells the ECU howmuch the tb is opening? Or do u reckon sine the tb has changed the MAP sensor is getting the wrong readings.
Or maybe the accelerator cable isn't pulling it open enough?

[DakDak]

Try resetting the ecu.

[GU357]

just disconnect the battery?

[JPR28610]

yeah, to reset the ecu disconnect the negative terminal for about an hour. connect, then take it up and down the street for the computer to 'relearn' itself. see how that goes.

[GU357]

alright will give it a shot tonight. really sucks atm. struggling to pull power from it, she used to be so responsive but now its mentally disabled

[GU357]

forgot to ask but will this reset the TPS? cause i think we might stuffed up when we put the TPS back on.

[DakDak]

The TPS should recalibrate itself with a ecu reset. It may not be as simple as disconnecting the battery though. There may be a fuse you need to remove.

[JPR28610]

http://www.ozhonda.com/forum/showthread.php?120191-DIY-Calibrating-the-Voltage-on-the-TPS&highlight=tps

[GU357]

Can't seem to find the idle adjustment. On the jazz. Got the tps right but at idle in D It's trying to drive off.
So the clutch is engaging to drive off

[GU357]

any ideas?

[TbM]

any ideas?

Some newer cars ive worked on dont have idle adjustment screw, its done by the iacv and ecu.
make sure the throttle plate is closed and your throttle cable is not sticking/holding the throttle open.

What were your tps readings at CT and WOT?

[GU357]

when i set it according to the instructions its was at 4.5 and .48 but atm ive had to bring her down to .42 and subsequently the WOT is now 4.42V

i need to check again as to whether the butterfly is going all the way back down the the stop at closed throttle. because mayber thats causing it?

[TbM]

when i set it according to the instructions its was at 4.5 and .48 but atm ive had to bring her down to .42 and subsequently the WOT is now 4.42V

i need to check again as to whether the butterfly is going all the way back down the the stop at closed throttle. because mayber thats causing it?

I think the Jazz might have a slightly different setting than the old tps, had a quick look through that Service manual i posted for you the othr day and IIRC yours is meant to be roughly
CT=0.5v
WOT=4.8v
http://i1087.photobucket.com/albums/j480/tbmindustrys2/ghfhjf.png

If your throttle plate isnt closing then that may be the cause of it trying to drive off as its like you having your foot on the accelerator slightly.

[GU357]

yeh with my foot off the throttle the butterfly is not coming back down the to throttle stop i can adjust the throttle stop wo touch the butterfly but that would just increase the opening at closed throttle and then the TPS reading would be higher at CT. currently its at .42V or something and that stops it from driving off, but at 0.5V it seems even more likely to drive off being the ECU thinks i would have the throttle open further thats what was happening when i had it at the recomended .48V so .5V would only be worse?
might take her down to Honda ask them to recalibrate it. atm it drives OK cant really feel any difference.

[TbM]

Throttle plate should be closed, not sitting open. you need to actualy look at the throttle plate and see that its closing not just go by the throttle stop. once the throttle plate and throttle cable are set properly you can adjust/set the tps.

after adjusting tps i usualy reset ecu and relearn idle.

[GU357]

yehs i did that, i but after it re learnt idle it was still trying to lerch but not as much. im gonna give it another shot this time with the accelerator cable disengaged ill make sure the tb comes all the way to a closing, then adjusst the tps by holding the throttle fully open by hand, until i read the 4.8V. then bring her back to close and see what it reads.
then re attach the throttle cable.
is that a good idea?

thanks tbm youve been a massive help in my learning.

[TbM]

There should be enough slack in the accel cable for it to not stay on, if its tight that may be holding it on.

The Closed Throttle setting for the tps is the most important, i usually set the CT then see what the Wide Open Throttle reading is.

[GU357]

Ahhh ok and this setting the butefly is closed? As in not on the stop but there is no air gaps at all?

Ugh so frustrating. Does Honda do recalibrations lol.

[TbM]

Ahhh ok and this setting the butefly is closed? As in not on the stop but there is no air gaps at all?

Ugh so frustrating. Does Honda do recalibrations lol.
Yes the throttle body plate should be closed, the throttle stop should stop the throttle body plate just as it contacts the bore. no air gaps, your car should be idling from the IACV not a slightly open throttle plate.

im sure honda would be able to sort it out for you if your getting frustrated.

[GU357]

ok so a seperate valve should control my idle you say. where does the valve sit?
the honda mechanic when i called them said the idle is controlled by the throttle body and theres no seperate adjustment, or valve.

thanks heaps

[TbM]

Unless the service manual i have is wrong or im not looking up the right model it should be on the bottem of the stock TB, would assume its in the same place for the new Tb.

ill upload a pic from the manual, the pic has an EVAP valve on top of the TB, IIRC AUDM cars wont have this i think its for USDM as they have different emissions standards.

http://i1087.photobucket.com/albums/j480/tbmindustrys2/Untitled-2.png

[GU357]

Oh I see Yehp Omg that is so helpful. The s90 tb reused the stock bottom piece which is where that screw is located so it should be there will check when i get the car back. Does this also explain why there's a channel on the front that let's air in behind the butterfly?

[GU357]

http://i1184.photobucket.com/albums/z332/GU357/IMAG0110.jpg
http://i1184.photobucket.com/albums/z332/GU357/IMAG0109.jpg

[TbM]

Does this also explain why there's a channel on the front that let's air in behind the butterfly?
Yes there will be a path for air to travel from before the throttle plate through the iacv to the back of the TB. this allows your car to idle while the throttle plate is closed.

[GU357]

that doesnt explain it. ill just have to figure why the throttle plate isnt coming back to the stop tho. apparently it is stopping before the stop :S so my dad says.
ill get back to you guys thanks tbm i cant thank you enough.
also it looks as though the control is up against something
http://i1184.photobucket.com/albums/z332/GU357/IMAG0113.jpg
if u zoom in u can see its pushing against the metal like a tab stick out from it

also got headers in today, riding smooth.