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Put single chamber flowmaster now 400 dies out on fwy...
got a 79 f250 4x4 400 auto that I put a single chamber flowmaster on. When I punch it on the freeway it will go and go then crap out like a governor kicking in on a new car...was it the lack of back pressure from the new muffler? Or do I need to re adjust my air/fuel mix on the carb....help?????
could be lots of things. The different back pressure could be affecting the airflow/load through the heads. The cam may like a bit of load. had a friend (yes I do have friends-sometimes) that had a baffle/joiner in the exhaust turn on a regular basis doing similiar to yours. it would turn and block air-flow like a potato up your exhaust pipe. It would then come right. Not sure on regularity though. Youre sounds like clockwork when you give it some. How many mufflers did it have?
the small fuel line really hurts performance. makes the truck go lean after pullin hard for a stretch. I believe its a 5/16" and if rusted or restricted/kinked it gets even worse. also the 40's flow more air and will cause a engine go lean compared to a restrictive muffler. 40's are race muffler. used to run them yrs ago. just more stuff to keep you up at night what carb are you a running?
I get that, but ethanol gas has been around almost as long as gasoline (it was better known as ethyl). Just in the last few years laws were passed so stations have to tell you they use ethanol. I don't touch the stuff myself, but most vehicles made after 95 are supposed to be able to handle it. But as we all know, not all of them can. It causes the most problems in engines that sit for periods of time (boats, mowers, motorcycles, etc) that's when it can separate and start gelling up. I've always known 7-11 had crappy gas, but until that law passed didn't know why. Now 7-11s are starting to add 100% gas pumps because of a drop in sales over the last 5 years or so.
Why is there never enough time to do it right the first time, but always enough time to do it again??
....Will work for Rep points....
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