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picklesayrshire
12th August 2009, 22:22
Could a loose connection on the MAP sensor cause the car not to start or cut out.

Sparco_Tom
12th August 2009, 22:25
its possible but you can unplug it and it wil continue to run (badly) but it will still run

LeeM
12th August 2009, 22:30
my mates vts cuts out when the map sensor is unplugged and wont start again with it unplugged

SunderZ
12th August 2009, 22:54
I've got a diagnostic prob with mine and the car is dead

picklesayrshire
12th August 2009, 23:11
ive noticed that 1 of the connections has came off(the plug had been cut off and female spade crimps used), but had actualy snapped off the crimp, so im thinking this may have been causing me all these problems.

picklesayrshire
13th August 2009, 12:08
im hopin sum1 can tell me that a loose or bad connection can cause starting problems and the MIL light to cum on. plz

gd16
13th August 2009, 12:16
The TPS shares the same ground and 5v wire as the MAP sensor.

So if its one of these that is loose, then chances are you won't be getting a signal from the MAP sensor, and if its shorting out - the TPS signal will be wrong as well.


Goto the scrappies, get another MAP connector, with a good few inches of wires. Then cut off your one with loose/dodgy connections, and solder the new one in place - making sure its a good join and that you use heat shrink wrap or similar to avoid any bad connections.

AndySAXO
13th August 2009, 12:24
Also it the MAP is in good working order if un plug this will cut the car out!

as it need to know the Air pressure to run!

Andy

picklesayrshire
13th August 2009, 13:48
The TPS shares the same ground and 5v wire as the MAP sensor.

So if its one of these that is loose, then chances are you won't be getting a signal from the MAP sensor, and if its shorting out - the TPS signal will be wrong as well.


Goto the scrappies, get another MAP connector, with a good few inches of wires. Then cut off your one with loose/dodgy connections, and solder the new one in place - making sure its a good join and that you use heat shrink wrap or similar to avoid any bad connections.

The TPS as in crankshaft sensor?

Bickerton
13th August 2009, 14:21
The TPS as in crankshaft sensor?

As in the tps i believe, at the back of the throttlebody

gd16
13th August 2009, 14:36
TPS = Throttle Position Sensor
CPS = Crankshaft Position Sensor
IAT = Inlet Air Temp
ICV = Idle Control Valve

picklesayrshire
13th August 2009, 15:39
As in the tps i believe, at the back of the throttlebody

soz my mistake
, will check the wiring.

picklesayrshire
15th August 2009, 14:00
so a faulty map sensor or wiring to it could cause the car not to start, is this correct.

Bickerton
15th August 2009, 18:38
so a faulty map sensor or wiring to it could cause the car not to start, is this correct.

Could be one of the reasons, unfortunalty this kinda thing and dodgy idle can be one of many things on the j4 engine