|
Certain flavors of old Bosch fuel injection do in fact use throttle position switches, not sensors. All they do is tell the ECU that the throttle is closed (so that it can regulate idle speed using an auxiliary air valve) or wide open (so that it can enrich the air-fuel mixture). Everything in between is handled by whatever air flow meter the specific system uses. In your truck I think it’s K-Jetronic? In any case a bad switch would probably only cause stalling at idle since the ECU doesn’t realize the throttle is closed. There are almost never issues with the WOT side.. Volvos with K-Jetronic and LH-Jetronic are like this and Mercedes used the former in a bunch of cars so I figure they used a similar arrangement of controls/control logic.
|
#
¿
Jul 30, 2019 00:03
|
|
|
|
| # ¿ Apr 26, 2024 03:35 |
|
|
None of the various Jetronic cars I’ve worked on have had any facility for a higher idle when the engine is cold. They deal with cold starts by running a dedicated cold start injector that enriches the mixture until the engine starts to warm up. In cars with the more basic versions of CIS/K-jet, once the cold start injector cuts off there’s another component called the warmup regulator that takes over - it controls a fuel pressure circuit that allows it to gradually lean out the mixture as the engine warms up. I found this explanation of the components and behaviors of KE-Jetronic, which the OP’s truck has - it has a few electronic wrinkles that I’m not familiar with. Hopefully this is of some assistance with troubleshooting. https://www.benzworld.org/threads/bosch-ke-jetronic-overview.1553096/
|
|
#
¿
Aug 29, 2019 19:27
|
|