MPI MAP Sensor Plug (14 replies)
Hi, anyone know where I can get a replacement plug/pins to remake the MAP sensor connection. This is a three way plug.? thanks James
Hi out if interest what order should the spark plugs be connected from the coil pack? Jaynes car is connected as follows: Lower left-4, Lower right-1, top right-3 , top left -2. Is this correct and does int make any difference at all , I am told there are two coils in the pack and I/4 or 2/3 should be connected to different coils? , I have seem many answers to this on other forums but each is suggesting the other is wrong , so what is correct....:(.
Looking from passenger side wing at drive belt end of engine (number 1 cylinder) Coil pack output is a staggered layout. Bottom left (lowest and nearest radiator) number 1 cyl, bottom right (next lowest but near engine) number 4 cyl, next up on left (nearest front) number 2 cyl, finally top right nearest the spark plugs number 3 cyl. Yes the MPi uses wasted spark or to put it in cheap turns could only be bothered to fire the coil twice but then fire it twice as often. ... each cylinder gets 2 sparks, one just after full compresion as normal and then at the same point on exhaust out.
James, just checked on mine rather than trust my memory;- looking down onto the lead outlets from the coil pack, it's cylinder 1- bottom left, 2 - top left, 3 - top right, 4 - bottom right. In other words, clockwise from bottom left 7 o'clock position. Looking at the numbers you have shown I think the leads have been fitted with number 1 at the left hand side of the engine (driver/clutch housing side) but actually cylinder 1 is always the one on the right, radiator end on non-MPi cars. On the coil pack, cylinder 1 is bottom left, looking from the radiator end of the engine.
I think the reason the car may be running rough with wrong lead assignments is that (I believe) the ignition on MPis runs on what is called wasted spark;- i.e., there is a spark every revolution of the engine, so in other words two per four stroke. Happy for anyone to put me right if this last paragraph is incorrect though.
Hi thanks all, the leads for cylinder 1 and 4 were reversed , but this makes no difference if corrected , which from what I understand is normal/ok??
Anyway back to the MAP sensor , I have replaced this and still no cure, f***.!!! What I dont understand is that with the MAP sensor plug disconnected there is no difference in the engine running? This suggests the map sensor is a waste of time and does sweet nothing:) or there is no 'data' passing from the sensor to the ECU ie a cable fault. I maybe need to forget the MAP sensor and look elsewhere, if there is anyone who really knows there way around MPI,s then I would appreciate some help here... I do not surrender easily:)