BBK Sticking Throttlebody
Thread Starter
Burning Brakes
Joined: Oct 2010
Posts: 1,037
Likes: 28
From: Montclair New Jersey
BBK Sticking Throttlebody
I installed a BBK 52mm throttlebody on my 1986 automatic. I just changed all emission parts, fuel injectors, FPR, IAC, etc. My problem is that the car idles 200 rpm more than its supposed to. I set the TPS and Idle 5 times, its fine. If I tap the gas pedal it returns to normal or if I tap it back at the throttlebody. I have even tried a return spring...doesn't help. The only thing I notice is that when the car is off and warm or cold I can't get it to stick only when its running.
any help would be appreciated.....
any help would be appreciated.....
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
What you are describing is consistent with a TB that has worn shafts and the butterflies can be pulled off center
and bind up on the bore under vac ( while engine running )
There are several vendors on eBay that rebuild TB and will bore them to 52mm at the same time
Last edited by rodj; May 18, 2012 at 10:55 PM.
Drifting
Joined: May 2005
Posts: 1,336
Likes: 12
From: Chicago Executive Airport, formerly known as Palwaukee
No-IL Events Coordinator
St. Jude Donor '12-'13-'14-'15-'16-'17
If you have the wrong throttle body for your application, you will encounter this issue.
Ask me how I know!
Check with BBK. Over the phone will be much more productive than trading emails.
Good luck!
Ask me how I know!
Check with BBK. Over the phone will be much more productive than trading emails.
Good luck!
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
Check the travel on the tps, I seem to remember someone having the same trouble and the tps tang was barely hitting the throttle body casting. FWIW my BBK has worked flawlessly since I got it.
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Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
Disconnect the throttle cable. Does the tab hit the stopscrew? If it does, your cable if keeping the blades open. Bend the bracket or elongate the bracket mounting holes. If the tab still doesn't hit the stopscrew maybe there is a burr or something keeping the blades from closing.
Thread Starter
Burning Brakes
Joined: Oct 2010
Posts: 1,037
Likes: 28
From: Montclair New Jersey
Bbk
Disconnect the throttle cable. Does the tab hit the stopscrew? If it does, your cable if keeping the blades open. Bend the bracket or elongate the bracket mounting holes. If the tab still doesn't hit the stopscrew maybe there is a burr or something keeping the blades from closing.
Even if the TB works fine with the car off? I was thinking some kind of vacuum problem. Even with a helper spring the same thing. I bought about 20 springs to try.
thanks.
Thread Starter
Burning Brakes
Joined: Oct 2010
Posts: 1,037
Likes: 28
From: Montclair New Jersey
Bbk
Thread Starter
Burning Brakes
Joined: Oct 2010
Posts: 1,037
Likes: 28
From: Montclair New Jersey
Just wanted to update my thread.....I had my throttle body rebuilt and bored to 52mm. The car never ran better!!! Thanks for all the help. The car is starting to look and run like a vette again........
Advanced
Joined: Aug 2009
Posts: 99
Likes: 3
From: Brampton ON
What a coincidence.. I just purchased a brand new BBK 52mm as well.. same damn issue..
I'm so frustrated. Waited 3 weeks for this part.
Gonna have to get in touch with BBK on Monday. Unfortunately my old TB is in pieces, I had planned on re-boring it out, but the original shaft is bent and i just spent $400 on a doorstop.
Funny thing, I was going to purchase a Performance Products TB, and got sucked into getting the 'better' BBK. I have read so many places about people having this issue.
I highly doubt that BBK is making this stuff in the US. Probably getting imported from China.
I'm so frustrated. Waited 3 weeks for this part.
Gonna have to get in touch with BBK on Monday. Unfortunately my old TB is in pieces, I had planned on re-boring it out, but the original shaft is bent and i just spent $400 on a doorstop.
Funny thing, I was going to purchase a Performance Products TB, and got sucked into getting the 'better' BBK. I have read so many places about people having this issue.
I highly doubt that BBK is making this stuff in the US. Probably getting imported from China.
Thread Starter
Burning Brakes
Joined: Oct 2010
Posts: 1,037
Likes: 28
From: Montclair New Jersey
Bbk
What a coincidence.. I just purchased a brand new BBK 52mm as well.. same damn issue..
I'm so frustrated. Waited 3 weeks for this part.
Gonna have to get in touch with BBK on Monday. Unfortunately my old TB is in pieces, I had planned on re-boring it out, but the original shaft is bent and i just spent $400 on a doorstop.
Funny thing, I was going to purchase a Performance Products TB, and got sucked into getting the 'better' BBK. I have read so many places about people having this issue.
I highly doubt that BBK is making this stuff in the US. Probably getting imported from China.
I'm so frustrated. Waited 3 weeks for this part.
Gonna have to get in touch with BBK on Monday. Unfortunately my old TB is in pieces, I had planned on re-boring it out, but the original shaft is bent and i just spent $400 on a doorstop.
Funny thing, I was going to purchase a Performance Products TB, and got sucked into getting the 'better' BBK. I have read so many places about people having this issue.
I highly doubt that BBK is making this stuff in the US. Probably getting imported from China.
good luck
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
My BBK has never given me a moments trouble but you can darn sure well bet that if it had I would be screaming like a wild indian until they did something. Have you ever tried talking to them?
Thread Starter
Burning Brakes
Joined: Oct 2010
Posts: 1,037
Likes: 28
From: Montclair New Jersey
Bbk
Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
Yes I did but; because I bought the TB right after Christmas I was out of time for a refund. I could have sent it back to have it rebuilt but; not for free. I explained that it sat in the box until this month. They didn't care. I could have persued it more. At that moment I didn't care, I just wanted my vette back. The new designed BBK is giving alot of people trouble. Maybe you have the older model that looked like a stock TB. I also have a friend with the same problem on a camaro. He was lucky to get a refund. Good and bad experiences with all parts. All I know is that I have a new BBK ashtray.......
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
I agree! Between this and the TPI manifoild they never finished I won't be giving them any more of my money. rrt898, yes I do have the old style throttle body. I'd keep pestering them about it, time should not be a factor on a brand new piece that was never installed. If you get enough negative response in this thread I would send them a link to it.
Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
I agree! Between this and the TPI manifoild they never finished I won't be giving them any more of my money. rrt898, yes I do have the old style throttle body. I'd keep pestering them about it, time should not be a factor on a brand new piece that was never installed. If you get enough negative response in this thread I would send them a link to it.