hello.
i have a crx vtec turbo
b16a1 with t04e itr cams 550cc injector's and so on,
when i rev the engine up and stand still, under 2000rpm everything is normal, but when i go over 2000 rpm the engine goes up and down, about 500rpm. i think i don't have a vacuum leek, and the idle is perfect. i have it tuned and when i look at the map, the fuel is almost like original,

please post everything that you can think of. i have tried change the fast idle and the eacv, spark plugs ignition wires are fine,


Modified by anton_ at 3:28 AM 7/15/2007


Modified by anton_ at 3:31 AM 7/15/2007

 

rewrite that so people can understand what the hell you just said and maybe youll get some help... spell check is your friend

 

hey i have the same problem with my gsr turbo i think is somthing to do with tps on the throttle body mines only happen sometime still dont know wat to do sorry

 

my englisch is not so good. sorry.
hmm maybe i can try with another tps.
i have a vafc to så i can se the tps position, and when i drive around it also goes up and down. from 12% to 7%
also when i cruse around in 80mph the car goes down and "engeine brake" when it does that the tps get steady,
sorry for the bad eng, iam gonna make a movie so you can se and hear the problem

 

I have the same problem as you. We data logged and at anything under 10% throttle my injectors were randomly shutting off. The setup is LS turbo, RC 550 injectors, and hondata s200. Still don't know what the problem is though.

 

here is a video.
should the tps do that?
http://s161.photobucket.com/al...e.flv

 

sometimes the cut off is from the idle cut off seting in yer ecu... and from not having the idle valve plugged in and the tps not being calibrated correctly... but most of the time it can be eliminated with raising the idle fuel cut off setting

 

ok. i read that if you tune on the vafc the cut off can change. is that true? my car is tuned a little on the apexi.

 

vafc is like a band aid to real tunning... and i have no idea if u can make it better with hacking up the map sensor signal... i always do it at the ecu.

 

iam gonna buy a ostrich and start tune with BRE in a few months, then maybe i get rid of this ****.

 

in my EF, my stock LS did this also, never found the problem,

Stock ECU, untouched, OBD1 in my car.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris Tune &raquo;</TD></TR><TR><TD CLASS="quote">sometimes the cut off is from the idle cut off seting in yer ecu... and from not having the idle valve plugged in and the tps not being calibrated correctly... but most of the time it can be eliminated with raising the idle fuel cut off setting</TD></TR></TABLE>
This may be a stupid question but does Hondata s200 have that idle fuel cut of setting your talking about?

 

Anybody else have any ideas?

 

so there is no mechanical problem?

 

Hmm i have the same problem around 1500rpm.. lol.

 

mine does randomly when ever i blow off capped vacumm fittings. Other than that idles like a factory car, though its a swapped gsr boosted.

 

anybody else know whats wrong

 

i have read that it can be something that's called "fuel-cut" and if you have a apexi vafc the fulecut can be changed? is that right? if so, how can i make it so it doesn't cut the fuel on high vacuum?