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Old 05-10-2016   #11
cuisinartvette
 
Join Date: Aug 2005
Location: San Fernando Valley, CA.
Posts: 896
Default Re: Throttlebody work

How is polishing a tb going to pick up power?
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1990 ZR1, 142,000 miles-Black on black
4.09's Haibeck chip, 3"exh, K&N, meth inj.
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Old 05-11-2016   #12
Billy Mild
 
Join Date: Aug 2014
Location: Kansas City, MO
Posts: 838
Default Re: Throttlebody work

It's not for increased power but to fix my sticking throttle.

http://www.zr1specialist.com/HAT%20W...tle%20body.htm
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1985 Yamaha RZ350-NOT STOCK
1971 Yamaha AT1-Middle of a restoration
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Old 05-22-2016   #13
George Maz
 
Join Date: Dec 2014
Location: Long Island, NY
Posts: 295
Default Re: Throttlebody work

Quote:
Originally Posted by Dynomite View Post
OK....I have to ask......What issue could lead to catastrophic engine failure?
Marc Haibeck’s inspection discovered the right upper camshaft chain facing was missing. A new facing was installed. The plastic retaining tab had let go. The left side facing was inspected and found to be present, but the cam cover tolerance at the bolts had to be corrected There's a link on his site that explains what can potentially go wrong.

1990 #1727 street tuned & Dyno-tune now completed

434 rwhp, 366 torque, 511 crankHP
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File Type: jpg DSC_4162_zpseaaeb28d.jpg (76.6 KB, 15 views)
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1990 ZR-1 #1727

Last edited by George Maz; 05-22-2016 at 11:03 PM. Reason: added picture
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Old 05-30-2016   #14
Billy Mild
 
Join Date: Aug 2014
Location: Kansas City, MO
Posts: 838
Default Re: Throttlebody work

I got my TB and chip back. The car runs much smoother. He said my TB looked like a car with 100,000 miles on it. The tune is leaps and bounds better than what was on their initially. To think I have been driving it with this tune for so long. I thought it was just a clumsy running engine, that is not so. Idle is much improved as well.

I am still occasionally getting the high idle. If I stab the throttle it will come back down to where it should be instantly. Any suggestions on what I should look at next? IAC maybe?
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