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D-jetronic(electronic) injection Posted by DougM [Email] (#211) [Profile/Gallery] (more from DougM) on Thu, 31 Jan 2008 07:48:39 In Reply to: Re: EMS best year?, Bob, Thu, 31 Jan 2008 05:24:50 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I stole this info from another website, since it summed up theory without going into alot of details. The author is Kjell Nelin.
Fuel is delivered to the injectors via a high pressure roller type pump. Pressure is regulated by an adjustable regulator. A simple analog computer (ECU) processes a number of inputs and opens each injector as necessary to ensure proper mixture. The main determinant of mixture is the intake manifold pressure as measured by the pressure sensor. The mixture is fine tuned by the head temp sensor and an air temp sensor. The fuel injection points located in the bottom of the distributor provides the ECU timing and speed data. A throttle switch functions as an "accelerator pump". Cold starting is facilitated by a fifth injector which sprays gas into the air-box when the starter cranks and the engine is cold. This injector is controlled by the thermo-time switch and operates independently of the ECU.
There's alot of other websites with tons of detailed information, which are mainly written for Porsche, Mercedes, and VW, as those makes also used a similar system to what Saab used.
My '73 has been running the same d-jet set up since the mid 80's, as almost every single component came from my departed 74EMS, which I had driven since around 1986.
posted by 75.187.23...
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