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Old 04-29-2003, 08:13 PM
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Post engine vacuum and vacuum secondary carbs

I just put some 2.5in exhasut on my truck with some glasspacks.ITs real loud and sounds great but now my vacuum secondaries wont kick in.Could this be due to the reduced backpressure cause by my free-flowing exhaust?I really donw wanna run mechanical secondaries cosidering i'm in highschool and gas is expensive,lol.Any suggestions would be helpful.My carb is a Q-jet
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Old 04-29-2003, 08:47 PM
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The backpressure in your exhuast should have no effect on the vacuum your engine is producing. If anything, it would create more vacuum making the secondaries open sooner.
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Old 04-30-2003, 05:47 PM
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Qjet secondaries are mechanical, they have air valves that open as secondary air starts to flow. Make sure the lock out is working properly thats about the only thing that will keep them from opening.
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Old 04-30-2003, 07:40 PM
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thanks guys. I'll look in to the\ose air screws you are talkin about. I think i've tried to adjust them befoire without much luck.But i'll try again
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