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MG MGF Technical - hard to start

my 1996 mgf 1.8i has started to play up three weeks in garage and still cant solve problem it takes about
15 mins to start from cold when started runs great
this is a list of things that as been tested or replaced
rotorarm
coil
crank sensor
ecu temp switch
throtle potentiometer
and still it takes ages to start from cold.
has anyone had this problem can anyone help.
g hurst

First thing is to ensure that the battery is new/good.
2nd is to clean all connections, both earth and feed, between the battery and starter. Any voltage drop may result in a lower voltage to the coil and a poor spark.
Geoff F.
G. Farthing

the battery is good, will clean the earth conections
tomorrow, thanks geoff.
g hurst

Geoff,
Not sure which version ecu you have but, check and clean the MAP sensor, which may be part of the ECU.
cheers,
Branko
Branko

Geoff, did you just test or replace the crank sensor? If it was just tested it might be worthwhile getting it retested whilst the motor will not start or just replacing it. Robert
Robert Matthews 1

cleaned all battery conections, cleaned all electric conections,still stugling to start what is a MAP sensor and where is it situated, my ECU no MKC104110
my vin no ends AD009978
g hurst

Geoff, I still think it could be the crank sensor. My sons car displayed the same problem and it turned out to be the sensor. Does the car restart easily after it has been warmed up or is it only from cold that you have the problem. Robert
Robert Matthews 1

MAP-Sensor stands for Manifold Absolute Pressure Sensor.

At your car without VVC it is located inside the ECU.
http://www.mgfcar.de/mems1.9/dk_DCP_5675.jpg
The big black component with hose on the left.

http://www.mgfcar.de/mems1.9/index.htm
Pictures are from a broken ECU. Don't just tray to open it. That's speciallist works, if it is broken.

i.e. at
Incotronic ltd.
69 Great Hampton Street
Birmingham
West Midlands
B18 6EW

I'd double check the wiring of the Sensors to the ECU, including connectors at the ECU before I would believe in a faulty ECU.
Also check in to a MG workshop with Teatbook Computer for a failure check.

Did you already try to disconnect/reconnect the big Connector at the ECU ?
The thin wires there are those from the sensors and TPS.
Dieter

thanks to everyone for your sugestions,I am bit late repling i work nights at weekends,
to robert, the crank sensor was changed,and yes the car starts first time when warm,it takes ages to start
from cold.

g hurst

dieter.
i have taken all the conections off and cleaned them
with contact cleaner and replaced several times,
the sensor on the intake manifold is making a clicking
sound is this normal.
g hurst

Have you tried changing the HT leads, especially the one from coil to dizzy? It usually sorts my 11 year old out
Graham Martin

Make sure plug gaps are 0.8mm

HTH
Bruce Caldwell

This thread was discussed between 04/10/2007 and 16/10/2007

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