71 cutlass 350 stock th350 tranny stock
#1
71 cutlass 350 stock th350 tranny stock
Hey guys just wondering if anybody knows why when Im on the hiway say going 65 or 70 and I let off the gas my cutlass seems to make a popping or kind of backfire noises....I know its not back fire the RPM's are over 3000, When I put my headers on and had open headers going to mufller shop I could hear it worse then i got pipes welded to collectors and know still hear it but not as bad as with open headers.Any suggestions thanks
#4
#5
Sorry, on my edelbrock 1406 carb, there are two idle mixture screws. I turned them both in about 1/2 a turn. The popping stopped almost completely. At 80mph at WOT if I let off completely, it would pop a couple of times and stop. I assume thats normal.
But again, leaning the car out like that did negate performance around 30-35mph. Second gear didn't seem to have the same pull, so I turned them back out.
I may have a slew of other problems, but this happened to me. Maybe someone else can explain as to why.
But again, leaning the car out like that did negate performance around 30-35mph. Second gear didn't seem to have the same pull, so I turned them back out.
I may have a slew of other problems, but this happened to me. Maybe someone else can explain as to why.
#6
Leaning the idle air/fuel mixture will have no effect on your performance off idle. So you have another problem.
As copper said, it's normal, unles it's a very loud backfire. Hi flow exhaust are a bit noisier than stock.
As copper said, it's normal, unles it's a very loud backfire. Hi flow exhaust are a bit noisier than stock.
#7
But granted the other problem is not related and relates to another cause.
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gscott819
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July 28th, 2009 07:02 PM