hi all, does anyone know where the map sensor is on a 2011 1.7 diesel.
Hi ‘Nikko’.If you mean the mass air flow sensor it is just downstream of the air filter
MAPs are typically on petrol engines with throttles. Diesels are unthrottled.am talking about the MAP sensor, I just can't find it for looking, I have done work on cars before just never had to find the map sensor, I want to check to see if the outdated sensor like they have fitted on my Ceed GT
the engine in question is a diesel. If it had a throttle to control how much air goes into the combustion chamber then it would not be diesel. Not to be confused with swirl flaps.Your car certainly has a throttle - it's the thing which controls how much air gets into the combustion chamber.
it is only a wind up if you are doing the winding up.Swirl flaps perform an entirely different function - it is you who is confused.
Lots of throttle bodies for diesel engines available to purchase on the interweb
This is a wind up isn't it?
I am saying that your assertion that diesels do not have a throttle is plain wrong.it is only a wind up if you are doing the winding up.
are you saying that on a diesel engine there is a throttle linked directly to the accelerator pedal to control the amount of air flow and so to control power output? If not, what are you saying?
From memory, or what remains of it!…...the ECU dictates how much fuel the diesel injectors squirt into the combustion chambers. The ECU is advised by sensors what is required and the butterfly valve in the throttle body isn’t opening and closing the airflow to the cylinders so much as signalling to the ECU the position of the valve under the pressure of the driver’s foot. The long word description of the butterfly valve is ‘potentiometer’ and that, allied to the other information from sensors informs the ECU how much diesel the injectors should fire into the combustion chambers…….roughly!
You are describing the Otto cycle.I am saying that your assertion that diesels do not have a throttle is plain wrong.
To answer your questoin:
Sticking to drive by wire engines (most modern engines are drive by wire), the throttle is moved by an actuator in response to ECU commands which takes account of the accelerator pedal position (and other conditions which might cause the throttle to depart from the accelerator position, such as rev limit, engine overheat, traction control, ESP intervention, limp mode, stall preventer, and with automatics, pending gear shift - there may be others). There is no direct link between the throttle position and the accelerator pedal position but there is an indirect link via the ECU and under ordinary conditions the throttle position follows the accelerator position. The throttle controls the amount of air inducted and thus the amount of power produced.
Now please explain why I can purchase throttle bodies for a wide variety of diesel engines if, as you have claimed, they do not have one?