I'm going to put this out here to see if any one familiar w/ the GM TBI system has some ideas.
I have a bone stock 1990 Camaro RS V8 305 TBI. I am having an issue that "feels" like ignition dropout, but at this point I do not know.
The issue I have is extreme backfire, loss power on acceleration, but only between about 18-2600rpm below that and above that range it is just an occasional stumble(dropout).
The engine has a new Dist, coil, plugs, wires, cap, rotor, ign module. No engine codes stored. manifold vac is a steady 18 @idle Base timing is a stable 2degrees @ idle w/ advance wire disconnected, both injectors have a nice even cone spray pattern. The issue is also very minimal when in open loop just an occasional stumble no matter RPM , but as soon as it warms up and goes closed loop it gets bad between 1800-2600rpm
In neutral it will rev just fine without the backfire, just the occasional stumble.
Any thoughts,ideas would be very helpful.
I have a bone stock 1990 Camaro RS V8 305 TBI. I am having an issue that "feels" like ignition dropout, but at this point I do not know.
The issue I have is extreme backfire, loss power on acceleration, but only between about 18-2600rpm below that and above that range it is just an occasional stumble(dropout).
The engine has a new Dist, coil, plugs, wires, cap, rotor, ign module. No engine codes stored. manifold vac is a steady 18 @idle Base timing is a stable 2degrees @ idle w/ advance wire disconnected, both injectors have a nice even cone spray pattern. The issue is also very minimal when in open loop just an occasional stumble no matter RPM , but as soon as it warms up and goes closed loop it gets bad between 1800-2600rpm
In neutral it will rev just fine without the backfire, just the occasional stumble.
Any thoughts,ideas would be very helpful.
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