More throttle body puzzler |
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More throttle body puzzler |
lsintampa |
Feb 23 2015, 08:57 PM
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#1
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Senior Member Group: Members Posts: 520 Joined: 28-January 13 From: Tampa, FL Member No.: 15,441 Region Association: South East States |
For all you 2.0 d-jet folks....
Look at your throttle body plate (the valve that closes over the TB opening). Does your valve have NO hole in it, one small hole, or does it have a nut and bolt in the hole? See three samples below. The third photo doesn't show the small hole plugged, but you get the idea. It is like the second with a nut and bolt plugging up the hole. Bonus question: What purpose does the hole serve and why is it closed on some TB's? (IMG:style_emoticons/default/beer3.gif) Thanks, Len PHOTO 1 NO HOLE: PHOTO 2 SMALL HOLE: PHOTO 3 HOLE PLUGGED - THIS PHOTO DOESN'T SHOW IT, BUT JUST IMAGINE THE HOLE IN PHOTO 2 IS PLUGGED WITH A SMALL BOLT AND NUT. |
PlaysWithCars |
Feb 23 2015, 11:01 PM
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#2
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Senior Member Group: Members Posts: 524 Joined: 9-November 03 From: Southeast of Seattle Member No.: 1,323 Region Association: Pacific Northwest |
Idle bypass circuit plugged with carbon so someone drilled the plate to get enough air to idle? (unlikely though. you don't get any carbon build up this far up the intake runner.)
It used to be a common modification on muscle cars with carburetors and big cams. To get enough air to idle you had to open the throttle plate too far and it started to engage the transition circuit in the carburetor, or you could drill a small hole in the throttle plate to get enough air through and not have to open the plate so far. Made them run much better and allowed the carburetor circuits to work that way they were intended. Why someone would do it on a FI car though ??? |
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