rpm jumps when shifting, normal?

[elon3kgtslowner]

unless i've let off the throttle for nearly a full second before pushing in the clutch the rpms will jump before beginning to settle back down, anywhere from a couple hundred to over a thousand plus. just wondering if this was normal because with every shift i don't wait for i picture my syncros getting more and more worn. i looked around under the hood and saw whatever the idler screw contacts when i let off the gas. some springy black thing, i guess designed to let the rpms fall slowly instead of cutting off. well it seams to be the problem, if it made contact less farther out it would cutt off the air quicker and im guess prevent the jump in rpms. any ideas what this peice is and if it can be tweaked/replaced or even if its the culprit? sorry i don't have pics but i'll look around google and see what i can find. to post a pic u need a URL, what about pictures from file?

[Igovert500]

Um, the only thing I can think of that you are talking about....is a vacuum tube getting in the way of the throttle coming back down....which isn't good.

Um, your idle shouldn't jump, and nothing should be in the way of your accelerator moving...at all.

So please take pics or do a better job describing what is going on, because whatever you are describing isn't normal.

[elon3kgtslowner]

just got a job so i've been busy the past week. anyway yeah i'll get a digital camera from a friend and take some pics and see if i can describe it better. i had trouble posting pictures online though, when i click on picture add it just opens a box for URL, how do i put up pics?

[elon3kgtslowner]

i seam to be having trouble posting so im sorry if im writing duplicates. im gonna get a friend's digital cam and take pics and post. how do i put up pics because when i click on picture it prompts for URL. anyway idk what things are really called but there is a cord (from gas peddle) attached to a matal piece with a screw on it. there isn't any hose getting in the way of that (throttle?) peice moving. when the screw contacts whatever it contacts that piece takes its good old time compressing. (yeah pics def needed here) but anyway there isn't anything in the way is what im trying to get at. any other ideas?

[Morphius289]

Go to www.photobucket.com

It's pretty simple.





See? Simple.

[Igovert500]

[img]http.www.where ever your pic is.com[\img] Except, use the slash that goes the other direction (on teh '?' mark button)

[Linebckr49]

i took some pictures of the throttle body, cable, and surrounding areas. please describe in what picture you are talking about.

[elon3kgtslowner]

oh wow, hey thank you so much. i wish i had looked at the page before i got a friend's digital camera but my setup looks slightly different anyway. let me see if i can get the pics up before i start describing.

[elon3kgtslowner]

gas pedal is connected to the cord, which is connected to the piece surrounded in green. when i push the pedal, it pulls the cord and the (green) peice off the (yellow) piece. when i let off the gas the green contacts yellow and slowly allows the green to fall down to idle position. (i'm guessing by looking at it)

[elon3kgtslowner]

def thought that was the idle screw, since if it wasn't as long the car would idle lower, becuase it would make contact when it was farther and the intake was closed off a little more.


but anyway the yellow piece looks like its the culprit for the rpm jumps, i wish i had a movie of the throttle being let off and it slowwwly depressing down to its compressed position. hence when i shift : let off the gas and push in the cluth, the throttle isn't closed off like it is at idle yet and the engine is still adding gas and air, making the rpms jump, until it depresses more, cutting off air/gas, and slowing the rpms again.



what do u guys think? tweekable? fixable? even the problem?

[Igovert500]

So wait, when you pull them apart (reving up hte motor) do they snap back together quickly, or go really slowly.

Try taking off your intake at the throttle body, now look at the butterfly inside the throttle body. With engine off, open and close it as you were doing before (using pieces in green and yellow), is the butterfly snapping shut cutting off airflow immediately? I'm guessing no, by your description. It sounds like something needs to be oiled up, try hitting everything with some wd40.

Here is a link for throttle cable adjustment, see if that helps at all.

[Stealthee]

Considering I can keep my right foot planted on the gas and push the clutch in with the left to shift and barely raise the RPMs by 200 then Id say you have something stuck LOL

[Linebckr49]

Adjusting the Throttle Cable on a 3000GT

Check the Play in the Throttle Body Cable


This is the cable that goes from your cruise control box to the throttle body. The spec for free play in this cable is 1-2mm for manual transmission cars and 3-5mm for automatic transmission cars. It can be adjusted by loosening the two nuts in the picture and sliding the bracket away from the throttle body to tighten the cable. Make sure you don't tighten it too much or the throttle plate will never completely close. Often, this is the only adjustment you'll have to make to reduce free play in the accelerator cable.

[elon3kgtslowner]

as soon as i let off the gas, the two peices contact, but it doesn't get to compressed/resting position for at least a full second after. again i wish i had a video to show u guys. pic one, is right at contact, and the second is after it comes to rest. hopefully u guys can see what im talking about.





it doesn't look like much of a difference in these pictures but im thinking it can definetly account for the extra revs before the rpms start falling during shifting. does anyone know what the upper peice even is? i'll be happy to buy a new one and see if that works, i just have no idea what to call it. perhaps there is some owners manual online or part by part diagram online? i know they sell repair manuals in stores for like 40 bucks, i'd like to download one for free but i dont mind looking through one to try and find it.

[Linebckr49]

elon3kgtslowner--> PM sent