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Discussion Starter · #1 ·
I 've read in older Post that the Bosch Motronic M2.7 (c20let) have a air Temp Sensor and Also a Map Sensor. Also the Bosch Motronic Ecu's have and air flow meter.
My C20XE engine (LATE TYPE) with a Bosch Motronic M2.8 Have a different air flow meter from Previous c20xe engines (with Bosch Motronic M2.5), and also have an air temp Sensor. (Like the Bosch Motronic M2.7)
So I assume that my Ecu have and a Map Sensor on the inlet Manifold.
My Questions are the above:

1.Is the new type Air flow Meter a Hot Wire like the old one?
If not, what type is it?
2. If my Ecu have and a Map Sensor, what is the reason of it?
The early c20xe working with Air flow Meter
9hot wire type) and with Throttle Position Sensor.
I know other engines that using only a Map Sensor AND TPS to working.
Why the Bosch Motronic M2.8/M2.7 uses an airflow meter and a Map sensor together?
3. Also I noticed that when I disconecting the plug of my air flow meter the check engine is not going on. The engine have better response, but the idle goes eratic and the fuel consumption is increased very much on idle rpms.
4. How can I recognized if my inlet manifold have a Map Sensor?
Thanks. :)
 

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2.7 has an air pipe which goes to the ECU from the throttle body for the MAP sensor - this pipe is where most people tap into to add a boost gauge to save running an additional pipe through the bulkhead.
 

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Discussion Starter · #4 ·
Thanks for the replies. I asked because the Lexmaul Inlet manifold don't have a place to go a map sensor. So if the Bosch Motronic M2.8 not using a map sensor, there is not a problem.
But why when I disconect the air flow meter the flash error code don't flashes?
I heard from other mates with the older c20xe engines that if you disconect the air flow meter the ecu flash code will be on immediatly.
Also I think the new type of airflow meter it doesnt have a screw to adjust it.
 

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The M2.8 air flow meter is a hot-film type not hot-wire and It looks
like it dose have a MAP sensor.
I just looked at mine and its got a vacume hose form the inlet
manifold that gose to a small black box that has two wires
connected to it and anouther vacume hose that comes form the
box and into the bulk head :confused: dose it go to the ECU?
 

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Discussion Starter · #6 ·
T1000 said:
The M2.8 air flow meter is a hot-film type not hot-wire and It looks
like it dose have a MAP sensor.
I just looked at mine and its got a vacume hose form the inlet
manifold that gose to a small black box that has two wires
connected to it and anouther vacume hose that comes form the
box and into the bulk head :confused: dose it go to the ECU?
In which exactly place is this vacume hose in the inlet manifold?
Thanks
 

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Thinking about it that pipe gose to the carbon canastor thing and the black box is just a valve that lets the air in so it must just be the tubbies that have a MAP sensor.
 

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Discussion Starter · #9 ·
Tricky said:
To the left-hand side of the inlet as you look with the engine in the car. Quite low down. Under the amal valve.
So does it have a map sensor the bosch Motronic M2.8 for later c20xe engines or not? Because amal valve don't have the c20xe engines.
I must be sure because i want to order the lexmaul inlet manifold.
Thanks.
 

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alex new said:
So does it have a map sensor the bosch Motronic M2.8 for later c20xe engines or not? Because amal valve don't have the c20xe engines.
I must be sure because i want to order the lexmaul inlet manifold.
Thanks.
Forgot to mention I only know this for C20LET. Don't know about 20XE sorry.
 

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Discussion Starter · #11 ·
Tricky said:
Forgot to mention I only know this for C20LET. Don't know about 20XE sorry.
Thanks, so for the most opinions I believe that the later c20xe engines don't have a map sensor. I will check when I go home to be sure.
 
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