C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1985 - AIR injection cycling

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Old Oct 1, 2005 | 02:34 AM
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Default 1985 - AIR injection cycling

On my 1985, when does the ECM switch on AIR injection into the exhaust? The injection tubes in my manifolds are cut back flush with the inside diameter of the manifold and I'm afraid it my not be diluting well with the exhaust gases. My AFRs are high in the 16-17:1 area.
Any input appreciated.
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Old Oct 1, 2005 | 02:48 AM
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The cycle is: Engine start..port valve opens and pumps air into the exhaust manifolds for a few seconds, switch to Divert and it pumps air to the converter and is supposed to Dump to atmosphere while decelerating.

Last edited by Morley; Oct 1, 2005 at 02:51 AM.
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Old Oct 1, 2005 | 10:45 AM
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Does it dump air afterwards during idle? Acceleration? Cruise?
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Old Oct 1, 2005 | 04:53 PM
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Originally Posted by GRX
Does it dump air afterwards during idle? Acceleration? Cruise?
supposed to always be porting to the converter after it is done with the manifold injection, except on decel. It pumps to the converter to help it burn off any unburnt fuel. It is supposed to stop during decel to prevent backfiring.
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