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I just went through an extended search for these symptoms, and came across brim88's episode with the 87 Quad, which sounded very much like what I'm struggling with on my wife's '94 S4 Spider. I also read and saved the tech reference from Gubi on the Bosch airflow meter repairs (thanks to both of you).
brim88-- did the replacement of the airflow meter resolve the issue on your Spider?
Our car idles perfectly. It revs just fine. No other symptoms except that when you put the foot down and ask for acceleration, you hear this low roar as the throttle plate opens, but no response. It bogs, just barely speeds up, and you have to actually let up on the gas just to make some headway. No power at all on hills.
The fuel and air filters are new or nearly new, the airflow meter is clean, and the flapper seems to move without binding. I locate no air leaks nor false air in the intake system (new convoluted hose, secure clamps). The battery's new last spring and grounds are clean and tight. The idle air valve is secure and does not leak at the seal ring. The throttle position switch is correctly adjusted for full open/off idle positions and clamped securely. Fuel has always been Chevron 93 octane for the past 3 years we've had the car. No strange noise from the fuel pump nor tank negative pressure.
At this point I am suspecting the AFM, then secondly the fuel pressure regulator, then the pump inlet sock strainer, then the pump itself. What says the Alfa BB?
All feedback is VERY much appreciated. Keep the shiny side up, folks!
brim88-- did the replacement of the airflow meter resolve the issue on your Spider?
Our car idles perfectly. It revs just fine. No other symptoms except that when you put the foot down and ask for acceleration, you hear this low roar as the throttle plate opens, but no response. It bogs, just barely speeds up, and you have to actually let up on the gas just to make some headway. No power at all on hills.
The fuel and air filters are new or nearly new, the airflow meter is clean, and the flapper seems to move without binding. I locate no air leaks nor false air in the intake system (new convoluted hose, secure clamps). The battery's new last spring and grounds are clean and tight. The idle air valve is secure and does not leak at the seal ring. The throttle position switch is correctly adjusted for full open/off idle positions and clamped securely. Fuel has always been Chevron 93 octane for the past 3 years we've had the car. No strange noise from the fuel pump nor tank negative pressure.
At this point I am suspecting the AFM, then secondly the fuel pressure regulator, then the pump inlet sock strainer, then the pump itself. What says the Alfa BB?
All feedback is VERY much appreciated. Keep the shiny side up, folks!