rough idle and fast gear change issue (NOOB)

[norm84]

hi guys, just got my self a 94 gsr, and having a idling issue, and YES i have used the search button. but i can only find info on cars that are having LOW idle problems.
mine sits a bout 1100-1200 and hunts to almost 2000.
has someone come across this problem,
also i notice i cant change gears fast whist in high revs, WTF, its hard to put into the next gear. but it changes smoothly when driving normally.


thanks

Norm

 

[Qik-1.8]

hi mate
first off throw your loaction up for us members
for the second issue sounds like the sincros in your gear box are but in whatever gear its going it in.
the first issue can be series of things
have u adjusted the idle screw on the throttle body???
idle postion sensor may need relpacing
there could be a gasket leak around the throttle body

thats as much as i know some other members will have abit more info

 

[fat tony]

Norm when did u join up homie? We will play with ur idle control later today see if it does anything

 

[Dean]

I've got 10 bux on you've just put a new blow off valve on.
Otherwise it sounds like a vacuum leak, is it a recent problem or existing?

 

[fat tony]

Ah he bought the car like 2 days ago it was already doing it, vacuum lines are fine and it was doing it before the bov was put on... It'd not the first boosted car he's owned

 

[CLuTZ]

Try the usual- ISC, TPS and if it still seems like it's hunting, try the FIAV block off. I banged a TS magna throttlebody on my EVO and it sorted out the idle problems it was having.

As for the shifting issue- I had the exact same problem in my old VR4. It used to shit sweet az but anything over 5500rpm it wouldnt engage the gear. It turned out to the the 'xtreme' clutch. Swapped it out for an exedy and cured the problem.

Welcome to the club by the way


dre

 

[norm84]

Try the usual- ISC, TPS and if it still seems like it's hunting, try the FIAV block off. I banged a TS magna throttlebody on my EVO and it sorted out the idle problems it was having.

As for the shifting issue- I had the exact same problem in my old VR4. It used to shit sweet az but anything over 5500rpm it wouldnt engage the gear. It turned out to the the 'xtreme' clutch. Swapped it out for an exedy and cured the problem.

Welcome to the club by the way


dre

where is the ISC and TPS. and yhe as for the gears.. i think my clutch is on its way :thumbsdown:....

thanks

P.S. i dont know why didnt own one of these babys befor.. friggen awesome cars:thumbsup:

 

[kb24]

nice to see somone from the riff on here:thumbsup:mine did the same thing when i done the conversion and i stuffed around with the biss and the isc for ages it turnred out to be a dodgy earth on the harness near the ecu i just cleaned the surface and it fixed it right away

 

[Entaran]

What clutz said. TPS and ISC are on your throttlebody.

TPS = Throttle Position Sensor
ISC = Idle Stepper Controller

 

[Mopar]

Mines doing the same thing atm...

Revs just start fluctuating,from 1300 to 2000 rpm, adjust the idle screw an it eventually happens again.
Vac hoses are sweet.

 

[Gianni]

You can adjust the idle position sensor Which is the black sensor on throttle body. Other wise taje it off and clean it. Also could be tide stepper motor which is under your cooler pipe on the throttlebody. It's a light brown color. They are one of the main causes of this

 

[clone]

are you running any aftermarket comp ie haltech etc . someone may have been playing with your fuel maps

 

[EVO-00X]

More often than not someone has fukd around with the Throttle Position Sensor lol.
Most OEM TPS's have a white paint mark on them for alignment.... check to see if its been scratched or moved.
Also use the Workshop Manual to test the TPS resistance and the ISC resistance.

 

[4piknup]

mopar,
setting the tps resistance by ohm meter is close, but not that accurate, but it will get you going.
that idle screw is not really meant to be adjusted, it sets the isc position so its not bottom or topped out often. (which will cook the coils and maybe the isc drivers in the ecu.)

you shouldnt really be moving the tps and especially the biss 'idle screw' as without the right tools you will never get it right. the car wont know when its meant to be at full throttle and when its meant to idle, it will not be as smooth as it could be.

check your isc coil resistance as it sounds typically like stuffed isc

 

[Mopar]

mopar,
setting the tps resistance by ohm meter is close, but not that accurate, but it will get you going.
that idle screw is not really meant to be adjusted, it sets the isc position so its not bottom or topped out often. (which will cook the coils and maybe the isc drivers in the ecu.)

you shouldnt really be moving the tps and especially the biss 'idle screw' as without the right tools you will never get it right. the car wont know when its meant to be at full throttle and when its meant to idle, it will not be as smooth as it could be.

check your isc coil resistance as it sounds typically like stuffed isc

OH hoh spaghetti ohhh!
Yeh ive played around with that screw abit,isnt there a spring behind it? I thought maybe thats stuffed and thats why its doing that...

Yeh it definately has felt smoother than what it is atm.

Fucking isc...
Il have a look at it.
Thanks also gianni.