Map sensor

1. picklesayrshire Frequent Poster Joined: Nov 2007 auchinleck Posts: 682 Saxo VTS (Cammed)

   #1 12th August 2009, 23:22

   Could a loose connection on the MAP sensor cause the car not to start or cut out.
2. Sparco_Tom Saxperience Addict Joined: Jan 2007 Aylesbury, Bucks Posts: 12836 Yeaaahh Fiesta

   #2 12th August 2009, 23:25

   its possible but you can unplug it and it wil continue to run (badly) but it will still run
3. LeeM Saxperience Post Whore Joined: Feb 2008 Liverpool Posts: 7393 Black Corsa C SRi

   #3 12th August 2009, 23:30

   my mates vts cuts out when the map sensor is unplugged and wont start again with it unplugged
4. SunderZ Established Member Joined: Sep 2005 Guiseley, Leeds Posts: 1064 Vts turbo, 1.1 dsire, Pug 207.

   #4 12th August 2009, 23:54

   I've got a diagnostic prob with mine and the car is dead
5. picklesayrshire Frequent Poster Joined: Nov 2007 auchinleck Posts: 682 Saxo VTS (Cammed)

   #5 13th August 2009, 00:11

   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.
6. picklesayrshire Frequent Poster Joined: Nov 2007 auchinleck Posts: 682 Saxo VTS (Cammed)

   #6 13th August 2009, 13:08

   im hopin sum1 can tell me that a loose or bad connection can cause starting problems and the MIL light to cum on. plz
7. gd16 Frequent Poster Joined: Nov 2003 Tayside Posts: 893 S/c VT!?

   #7 13th August 2009, 13:16

   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.

   1 user thanked this post: picklesayrshire
8. user_10176 Saxperience Post Whore Joined: Jun 2006 Ramsey st marys, peterborough Posts: 8288 Saxo's, Corsa (Daily)

   #8 13th August 2009, 13:24

   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

   1 user thanked this post: picklesayrshire
9. picklesayrshire Frequent Poster Joined: Nov 2007 auchinleck Posts: 682 Saxo VTS (Cammed)

   #9 13th August 2009, 14:48

   Quote:

   Originally Posted by gd16 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?
10. user_26394 Saxperience Addict Joined: Aug 2008 Bedworth Posts: 10221 106 gti

    #10 13th August 2009, 15:21

    Quote:

    Originally Posted by picklesayrshire The TPS as in crankshaft sensor?

    As in the tps i believe, at the back of the throttlebody
11. gd16 Frequent Poster Joined: Nov 2003 Tayside Posts: 893 S/c VT!?

    #11 13th August 2009, 15:36

    TPS = Throttle Position Sensor
    CPS = Crankshaft Position Sensor
    IAT = Inlet Air Temp
    ICV = Idle Control Valve
12. picklesayrshire Frequent Poster Joined: Nov 2007 auchinleck Posts: 682 Saxo VTS (Cammed)

    #12 13th August 2009, 16:39

    Quote:

    Originally Posted by Bickerton As in the tps i believe, at the back of the throttlebody

    soz my mistake
    , will check the wiring.
13. picklesayrshire Frequent Poster Joined: Nov 2007 auchinleck Posts: 682 Saxo VTS (Cammed)

    #13 15th August 2009, 15:00

    so a faulty map sensor or wiring to it could cause the car not to start, is this correct.
14. user_26394 Saxperience Addict Joined: Aug 2008 Bedworth Posts: 10221 106 gti

    #14 15th August 2009, 19:38

    Quote:

    Originally Posted by picklesayrshire 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