Jhebbard
New member
- Joined
- Mar 16, 2004
- Location
- Lithia, FL
OK, I know my 1992 740 turbo LH2.4 only >simulates< throttle pump action. My question is, how does it do this?
I've been trying for several years to rescue my (former) daily driver from the throes of death caused by old age and sitting outside i Florida's heat and humidity. Little problems like the relaxing spring tension of silicon-bronze spring clips and the like are causing intermittents that suggest most of the problems are electrical connections.
I did replace the AMM which seemed to help for a while.
At present the engine (a fully rebuilt 1993) starts nicely, and the air-fuel meter (F-A M) shows a gradual progression from lean (red) to nice yellow ("normal") as the coolant temperature sensor warms up. But here (and anywhere during warm-up) stabbing the throttle stalls the engine as the F-A meter plummets to full lean. Releasing the throttle restores a nice idle at "normal."
My question: what function drives the mixture rich on quick throttle action, the AMM, the throttle switch, obviously not the on-board O2 sensor-it's too slow. Does anyone have a print-put of the Bosch software this thing runs on?
Any help will be appreciated. I'd love to re-chip this beast (it has a Garret turbo) but it needs to run before that investment.
I've been trying for several years to rescue my (former) daily driver from the throes of death caused by old age and sitting outside i Florida's heat and humidity. Little problems like the relaxing spring tension of silicon-bronze spring clips and the like are causing intermittents that suggest most of the problems are electrical connections.
I did replace the AMM which seemed to help for a while.
At present the engine (a fully rebuilt 1993) starts nicely, and the air-fuel meter (F-A M) shows a gradual progression from lean (red) to nice yellow ("normal") as the coolant temperature sensor warms up. But here (and anywhere during warm-up) stabbing the throttle stalls the engine as the F-A meter plummets to full lean. Releasing the throttle restores a nice idle at "normal."
My question: what function drives the mixture rich on quick throttle action, the AMM, the throttle switch, obviously not the on-board O2 sensor-it's too slow. Does anyone have a print-put of the Bosch software this thing runs on?
Any help will be appreciated. I'd love to re-chip this beast (it has a Garret turbo) but it needs to run before that investment.