Check for any interference between the throttle body and throttle plates and between the air horn and air valve (if so equipped).
I once owned a 1979 Trans AM with TA 6.6 Pontiac 400 CI engine and 4 speed transmission.
Due to an intermittent stumble upon acceleration (another issue entirely and quite a subtle problem in itself), I rebuilt the Rochester Quadrajet carburetor (no help, as it did not need rebuilding). Upon reassembly, I followed the German, goodentight practice when tighteninig the screws attaching the hair horn to the float bowl, overtightening them in the process.
The added stress caused the air horn casting to deform over the next several months, eventually resulting in an interference between the secondary air valve and the air horn. The interference was extremely minor, resulting in no visible evidence to the naked eye, but was enough to prevent the secondary air valve from opening in certain conditions, depending upon temperature, etc.
The air valve seemed to always work properly when trying to find the gremlin but would hang up in the worst possible situations.
It took me over a year to find the gremlin but 10 seconds with a Dremel tool solved it once found.
Wish I still had the two 1979 WS6 TA 6.6 Trans AMs that I once owned, especially the 10 year anniversary model with 1,200 miles.
Upload one or more videos to your post. Photo filesizes should be less than 300K and Videos, less than 2MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Restoring a John Deere 2010 Diesel Tractor - by Jim Nielsen. Following seven years working in California's Silicon Valley, my wife, baby son and I moved back to Australia to retire. We bought a small 'farm' of about 50 acres near Bendigo, in the state of Victoria. I soon found that it would be very useful to have a tractor around the place for things such as grading our long drive and brush-hogging the fields. I was also embarking on planting 1000 eucalyptus trees, and hence I would need a ripper, small disk plow, sprayer etc. to get these things accompli
... [Read Article]
Latest Ad:
1945 Farmall wide body gas with pto and front plow. Runs good but needs new points.
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
