Ported TB, now high idle.
02-12-2009, 06:11 AM
#1
Ported TB, now high idle. I ported my TB today, just used a dremel and ported it pretty big, also knife edged the blade and cut the shaft, and now its idling around 900-1100 stopped at a light and around 1800-1900rpm if I put in in D or N. When I start the car, it idles normally at 500rpm, but once I start moving I get these problems. The pedal also feels like the blade is getting a little stuck off idle... Any ideas?
02-12-2009, 06:45 AM
#3
yup sounds like you ported to close to the throttle blade, also i am guessing you took off too much material when you knive edged the butterfly...might wanna get a new blade...if that doesnt help, you will need a new throttle body...
02-12-2009, 09:37 AM
#5
When I was porting TB's for the masses I quit knife edging the blade because it was causing idling issues. There's no other way to fix it other than replacing the blade.
FYI, you're probably seeing 50% or less of the porting gains doing it with a dremel. There's no possible way you can properly blend, smooth, and remove the right amount of material with one. I've tried several times before and it's not possible, compared to using the correct tools. You might want to send yours off to be finished, and have the blade replaced at the same time.
FYI, you're probably seeing 50% or less of the porting gains doing it with a dremel. There's no possible way you can properly blend, smooth, and remove the right amount of material with one. I've tried several times before and it's not possible, compared to using the correct tools. You might want to send yours off to be finished, and have the blade replaced at the same time.
02-12-2009, 10:54 AM
#6
When I was porting TB's for the masses I quit knife edging the blade because it was causing idling issues. There's no other way to fix it other than replacing the blade.
FYI, you're probably seeing 50% or less of the porting gains doing it with a dremel. There's no possible way you can properly blend, smooth, and remove the right amount of material with one. I've tried several times before and it's not possible, compared to using the correct tools. You might want to send yours off to be finished, and have the blade replaced at the same time.
FYI, you're probably seeing 50% or less of the porting gains doing it with a dremel. There's no possible way you can properly blend, smooth, and remove the right amount of material with one. I've tried several times before and it's not possible, compared to using the correct tools. You might want to send yours off to be finished, and have the blade replaced at the same time.
Thanks!
02-12-2009, 11:18 AM
#7
9 Second Club
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02-12-2009, 12:03 PM
#8
Well I marked where the blade sits before I started porting and Im pretty sure I didnt hit that area... I drove it this morning and it seems like the blade wants to stick when in the closed position. For example ill start the car the idle will be normal but as soon as I tap the throttle it feels like I have to break the blade loose, and my idle problems begin from there. Is it possible the blade is not centered correctly?
02-12-2009, 12:06 PM
#9
Well I marked where the blade sits before I started porting and Im pretty sure I didnt hit that area... I drove it this morning and it seems like the blade wants to stick when in the closed position. For example ill start the car the idle will be normal but as soon as I tap the throttle it feels like I have to break the blade loose, and my idle problems begin from there. Is it possible the blade is not centered correctly?
02-12-2009, 12:08 PM
#10
Evan,
Sounds like the throttle blade is not centered or the blade is closing too much and binding on the housing. Center the blade on the housing by loosening the blade bolts and allowing the blade to sit freely while closed. Tighten the bolts in place. Then ensure the blade is not sticking as you crack it open, you will need to adjust the idel set screw to hold the blade just a hair open, just prior to sticking. If you need help, just bring it by.
Sounds like the throttle blade is not centered or the blade is closing too much and binding on the housing. Center the blade on the housing by loosening the blade bolts and allowing the blade to sit freely while closed. Tighten the bolts in place. Then ensure the blade is not sticking as you crack it open, you will need to adjust the idel set screw to hold the blade just a hair open, just prior to sticking. If you need help, just bring it by.
02-12-2009, 05:34 PM
#11
12 Second Club
i didnt knife-edge my blade seeing that it is really easy to screw up and not seal all the way. i wouldnt recommend knife-edging the blade. will difinitely cause probs if screwed up and is very simple to screw up
02-12-2009, 09:20 PM
#12
Evan,
Sounds like the throttle blade is not centered or the blade is closing too much and binding on the housing. Center the blade on the housing by loosening the blade bolts and allowing the blade to sit freely while closed. Tighten the bolts in place. Then ensure the blade is not sticking as you crack it open, you will need to adjust the idel set screw to hold the blade just a hair open, just prior to sticking. If you need help, just bring it by.
Sounds like the throttle blade is not centered or the blade is closing too much and binding on the housing. Center the blade on the housing by loosening the blade bolts and allowing the blade to sit freely while closed. Tighten the bolts in place. Then ensure the blade is not sticking as you crack it open, you will need to adjust the idel set screw to hold the blade just a hair open, just prior to sticking. If you need help, just bring it by.
