Why don't my rpms drop when i push in the clutch on my car? suggestions?

[the t3d]

it does it most of time when i i shift gears, especially when it's cold and in the below 3000rpm range. i don't really notice it when i boost and shift. so i'm just curious if anyone has had this problem and/or suggestions...thanks

-t3d

 

[the t3d]

RPMs rise when i push in the clutch to shift if that wasn't clear =0)

 

[Kevin]

do they sort of rise a little and dont drop right away? but do drop? lol hope u understand

 

[Kevin]

oh ya also. check for vac leaks. check the tps, check iscv. check the air bypass screw if u have one

 

[turbo87targa]

Not sure if we are talking about the same thing, but one of my pcv hoses had a split right on the valve cover nipple, so whenever I accelerated and shifted my rpms would jump up pretty hard.

 

[Kevin]

Not sure if we are talking about the same thing, but one of my pcv hoses had a split right on the valve cover nipple, so whenever I accelerated and shifted my rpms would jump up pretty hard.

i think u just answered your own problem? lol
fix that first and see what happens

 

[TurboStreetCar]

Your saying if you go into boost and push and hold the clutch, the engine will continue to rev at the same rpm with your foot completely off the gas pedal? If that's the case your gas pedal is probrably sticking.

 

[hvyman]

when you push the clutch in and shift the rpms are supposed to drop. if you push the clutch in at idle they should(maybe) rise a tad because of the drop in load.

i dont get the question?

 

[turbo87targa]

i think u just answered your own problem? lol
fix that first and see what happens

Haha I'm not the OP. I was suggesting what his problem might be

 

[the t3d]

lol ok. the problem is when i'm shifting gears, the rpms will rise a decent amount. they eventually drop, but i'm usually shifting before that happens. it drives me crazy cause my exhaust is pretty loud. i also don't want to burn up my clutch sooner than it's supposed to. does that helps? =0)

-t3d

 

[isnms]

Check your dashpot is positioned correctly and no holes in the hose

 

[suprafanatic]

are you taking your foot off the gas pedal completely when you shift? also does it idle high when you first start your car? or just after driving it for a while? To me it sounds like your throttle or pedal is sticking some. make sure your throttle closes all the way, and make sure your gas pedal pull all the way out.

 

[TurboStreetCar]

Your saying if you go into boost and push and hold the clutch, the engine will continue to rev at the same rpm with your foot completely off the gas pedal? If that's the case your gas pedal is probrably sticking.

 

[the t3d]

are you taking your foot off the gas pedal completely when you shift? also does it idle high when you first start your car? or just after driving it for a while? To me it sounds like your throttle or pedal is sticking some. make sure your throttle closes all the way, and make sure your gas pedal pull all the way out.

yea my foot is completely off the pedal when i shift. yea it idles pretty high when it's cold and then comes back down once it warms up, but sometimes even when it's all warmed up, it will idle high anyway. the TB is clean as can be. i'll check the dashpot for holes and such. i have pretty good spring tension on the TB plate and i've checked the cable recently. i was thinking that maybe the ISC just wasn't responsive as much as it should be??

 

[TurboStreetCar]

When it idles high put your foot under the pedal and pull it up towards you. If the engine keeps Reving with no input the throttle Is sticking or something is holding the throttle plate open.

 

[the t3d]

i will try that

 

[casgallo]

crazy lean?

 

[T-MA71]

When i had an N/A it would do that. I would usually cruise at 2k-2.5k rpm and when i would push in the clutch itll rise to ~3K for a second or so then drop. Turned out one of the idle adjustment screws on the TB was missing, dunno if its the same issue but hope it helps.

 

[Venomstreetmach]

lol ok. the problem is when i'm shifting gears, the rpms will rise a decent amount. they eventually drop, but i'm usually shifting before that happens. it drives me crazy cause my exhaust is pretty loud. i also don't want to burn up my clutch sooner than it's supposed to. does that helps? =0)

-t3d

CHECK YOUR THROTTLE LINKAGE HARDWARE ON TOP OF THE VALVE COVERS. SEE IF YOU HAVE A BUSTED SPRING OR A BENT PART. HAPPENED TO MY A WHILE BACK. Also check for vacuum leaks at the throttle body.
Check vacuum lines. But I would say check the idle air mix screw and replace if necessary

 

[the t3d]

alright it's not the throttle linkage. i'm running straight cable and i tried lifting on the pedal while the idle was high and it did nothing. my idle screw is in there. i actually raised the idle alittle because sometimes at high rpm decelleration, if i push in the clutch real quick, the rpms will fall too quick and sometimes stall. i'm going to check for vacuum leaks. and i got a spare ISC i'm gonna put on and see if anything changes.