Home throttle body porting problem.
Thread Starter
Pro
Joined: Oct 2005
Posts: 641
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From: Tampa Fl/Afghanistan
Home throttle body porting problem.
I decided to port & polish my throttle body on my '05. Basically, a mild job with the Dremel and some fine sandpaper. After installation, the car stumbled a bit then recorded "reduced engine power" on the DIC. After checking all connections and disconnecting the battery for 15 minutes, I had the same problem. Closer inspection revealed the throttle blade is now getting stuck in the closed position. So, did I screw the TB up? To date, I've not pulled any codes, but clearly recognize it the is the TB (my fault) and nothing to do with the gas pedal.
and just when my mods were going so smoothly....
and just when my mods were going so smoothly....
Racer
Joined: Jul 2007
Posts: 497
Likes: 0
From: Tenneforniaska.
did you remove the throttle blade when you ported it? If so it may not have centered when you put it back together. You have to leave the little bolts loose, close the throttle and make sure the blade centers up by shifting it around a little. Then snug the screws and make sure the throttle dosen't stick.
Drifting
Joined: Jul 2000
Posts: 1,861
Likes: 1
From: Bremerton WA
St. Jude Donor '09
Sorry to hear about your issue. Give it a couple of tries on the recentering as mentioned above. Maybe even try to lightly clearance the edge that is hanging. If you can't get it right, shoot me an email and I'll hook you up with a ported replacement at a very good price.
For the record, in the early days of my LS2 TB porting, I killed 5 of the TB's and no amount of clearancing or recentering fixed it. Once it went "Reduced power" it always did. Sometimes it took up to 150 miles or so to trigger the codes.
I'm hoping you are more lucky than I am!
For the record, in the early days of my LS2 TB porting, I killed 5 of the TB's and no amount of clearancing or recentering fixed it. Once it went "Reduced power" it always did. Sometimes it took up to 150 miles or so to trigger the codes.
I'm hoping you are more lucky than I am!
Team Owner
Joined: Aug 2003
Posts: 38,314
Likes: 35
I decided to port & polish my throttle body on my '05. Basically, a mild job with the Dremel and some fine sandpaper. After installation, the car stumbled a bit then recorded "reduced engine power" on the DIC. After checking all connections and disconnecting the battery for 15 minutes, I had the same problem. Closer inspection revealed the throttle blade is now getting stuck in the closed position. So, did I screw the TB up? To date, I've not pulled any codes, but clearly recognize it the is the TB (my fault) and nothing to do with the gas pedal.
and just when my mods were going so smoothly....
and just when my mods were going so smoothly....
There have been a few dead throttle bodies reported here after DIY porting. Sounds like yours is the latest.
Drifting
Joined: Jul 2000
Posts: 1,861
Likes: 1
From: Bremerton WA
St. Jude Donor '09
Thread Starter
Pro
Joined: Oct 2005
Posts: 641
Likes: 0
From: Tampa Fl/Afghanistan
Well, I recentered the TB plate and the car started right up. Idled way high around 1700 RPMS, but reved ok. Then, the RPMs slowly started coming down and then right about 900 RPMs it went back into the reduced power mode. I did determine that the throttle was no longer sticking.
I suspect I may have removed too much material...
I suspect I may have removed too much material...
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Somba master
Joined: Mar 2005
Posts: 10,554
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Cruise-In 7, 9 & 12 Veteran
Wounded Warrior Escort '11
St. Jude Donor '07-'08-'09-'10-'11
Does anyone know if the OE throttle body is the same as on the L76 manifold?
And just how much HP does a ported TB produce?
GM
And just how much HP does a ported TB produce?
GM
Melting Slicks
Joined: Jul 2007
Posts: 2,052
Likes: 14
Sorry to hear about your issue. Give it a couple of tries on the recentering as mentioned above. Maybe even try to lightly clearance the edge that is hanging. If you can't get it right, shoot me an email and I'll hook you up with a ported replacement at a very good price.
For the record, in the early days of my LS2 TB porting, I killed 5 of the TB's and no amount of clearancing or recentering fixed it. Once it went "Reduced power" it always did. Sometimes it took up to 150 miles or so to trigger the codes.
I'm hoping you are more lucky than I am!
For the record, in the early days of my LS2 TB porting, I killed 5 of the TB's and no amount of clearancing or recentering fixed it. Once it went "Reduced power" it always did. Sometimes it took up to 150 miles or so to trigger the codes.
I'm hoping you are more lucky than I am!
Yea, I know, old thread but I didnt want to start another TB thread.
Cory, I sent you a PM. I have done the same thing but only to the blade itself. Im trying to get a replacement ported one from you or maybe even another blade if possible? Any help would be great.
Melting Slicks
Joined: May 2004
Posts: 3,017
Likes: 2
Sorry to hear about your issue. Give it a couple of tries on the recentering as mentioned above. Maybe even try to lightly clearance the edge that is hanging. If you can't get it right, shoot me an email and I'll hook you up with a ported replacement at a very good price.
For the record, in the early days of my LS2 TB porting, I killed 5 of the TB's and no amount of clearancing or recentering fixed it. Once it went "Reduced power" it always did. Sometimes it took up to 150 miles or so to trigger the codes.
I'm hoping you are more lucky than I am!
For the record, in the early days of my LS2 TB porting, I killed 5 of the TB's and no amount of clearancing or recentering fixed it. Once it went "Reduced power" it always did. Sometimes it took up to 150 miles or so to trigger the codes.
I'm hoping you are more lucky than I am!
Very cool Cory..
You have earned my respect, and when that Street Warrior for the LS3 hits the shelves expect some business from me.
Burning Brakes
Joined: Jun 2008
Posts: 1,214
Likes: 3
From: CA
Yeah porting your own TB is very tricky. I've ported all the TB's on all my LS based cars including my present 05 Z51. My car idles around 650-700RPMs.
I know it's too late but a good steip to take before removing material is to close the TB with your hand and with a sharpie trace along the inside and outside of the throttle blade. When you remove the blade to start porting the lines made by the marker will give you an idea of where not to port. removing material from here will allow additional air to creep in while the throttle is closed, creating a hgher idle speed and trouble codes.
Do you know if you removed material from this area?
I know it's too late but a good steip to take before removing material is to close the TB with your hand and with a sharpie trace along the inside and outside of the throttle blade. When you remove the blade to start porting the lines made by the marker will give you an idea of where not to port. removing material from here will allow additional air to creep in while the throttle is closed, creating a hgher idle speed and trouble codes.
Do you know if you removed material from this area?
Melting Slicks
Joined: Jul 2007
Posts: 2,052
Likes: 14
Yeah porting your own TB is very tricky. I've ported all the TB's on all my LS based cars including my present 05 Z51. My car idles around 650-700RPMs.
I know it's too late but a good steip to take before removing material is to close the TB with your hand and with a sharpie trace along the inside and outside of the throttle blade. When you remove the blade to start porting the lines made by the marker will give you an idea of where not to port. removing material from here will allow additional air to creep in while the throttle is closed, creating a hgher idle speed and trouble codes.
Do you know if you removed material from this area?
I know it's too late but a good steip to take before removing material is to close the TB with your hand and with a sharpie trace along the inside and outside of the throttle blade. When you remove the blade to start porting the lines made by the marker will give you an idea of where not to port. removing material from here will allow additional air to creep in while the throttle is closed, creating a hgher idle speed and trouble codes.
Do you know if you removed material from this area?
No, I didnt remove any from the center section and youre correct, I did the exact same thing with the sharpie but my main problem was knife edging the blade and then not recentering it correctly and clearancing 2 spots thinking it wouldnt make much difference. Now when you hold it up to the light you can see the spots where light shines through causing the problem.
FYI, on LS2/LS3 and LS7's, pay the $150 and have a pro do it. I have done 4 LS1 tb's but these are a bit more difficult AND EXSPENSIVE to fix.
Racer
Joined: Mar 2007
Posts: 379
Likes: 0
From: Quaker City Ohio
I ported and polished my own also. Didn't touch the area near the the throttle plate. I had removed the throttle plate to do this and neglected to mark the plate as to its position when reassembled. When I put it back in the car I got the same results as you, reduced engine power. I found that the plate was sticking slightly when fully closed. I ended up turning the plate 180 degrees and found it would then operate freely. I didn't grind or sand any area on the plate. Did you try turning or flipping the plate? Mine works perfect once the sticking problem was solved.
Melting Slicks
Joined: Jul 2007
Posts: 2,052
Likes: 14
Sorry to hear about your issue. Give it a couple of tries on the recentering as mentioned above. Maybe even try to lightly clearance the edge that is hanging. If you can't get it right, shoot me an email and I'll hook you up with a ported replacement at a very good price.
For the record, in the early days of my LS2 TB porting, I killed 5 of the TB's and no amount of clearancing or recentering fixed it. Once it went "Reduced power" it always did. Sometimes it took up to 150 miles or so to trigger the codes.
I'm hoping you are more lucky than I am!
For the record, in the early days of my LS2 TB porting, I killed 5 of the TB's and no amount of clearancing or recentering fixed it. Once it went "Reduced power" it always did. Sometimes it took up to 150 miles or so to trigger the codes.
I'm hoping you are more lucky than I am!
