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FORD MONDEO MK 2 SPEEDO AND LOSING POWER

HI, IV HAVE A FORD MONDEO MK2 T REG, THE PROBLEM STARTED A YEAR AGO WHEN THE CAR REFUSED TO START ONE DAY JUST HAD NOTHING THERE, AFTER INSPECTION AND A LOT OF PULLING PART FOUND THE ECU HAD BURNT OUT NOT EXCEPTING THE KEY CODE, WHILE I WAS AWAY ME DAD ORDERED A ECU (2ND HAND) AND KEY CHIPS HAD IT ALL FITTED STARTED UP AND WORKED FINE, EXPECT THE SPEEDO STOPPED WORKING ALSO WHEN ON THE MOTOR WAY THE CAR WILL REACH 50MPH WHEN YOU GO ABOVE 50MPH THE ENGINE CUTS ALL POWER THEN WHEN YOU DROP UNDER 50MPH BRINGS THE POWER BACK IN, TESTED SPEED WITH ANOTHER CAR BEHIND ME, THIS IS NOT LIMITED TO REVS JUST SPEED, I HAVE CHANGED THE VSS SENSOR ( SEED SENSOR, STILL NO SPEEDO. CAR STARTS FINE NO RUNNING PROBLEM, NEW BATTER ALL EARTHS CHECKED, SEEMS I WANT TO PUT IT BACK ON THE ROAD ITS THE ONLY THING STOPPING IT. ANY THOUGHTS,?

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  • matt Oct 30, 2012

    fuel pump or injectors would not cause the speedo to stop working compleltly or the power to cut at exacly 50mph. blocked injectors or fuel pump would cause an affect thro all performace the car has no problem hitting the red line all the way to 50 just that the point it cuts but the speedo not working must be related in some way possible ecu connected,

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4 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 66 Answers

SOURCE: Intermittent speedo for 1991 Honda accord but odometer & trip ok

its a faulty speed sensor or plug to speed sensor could be dirty

Posted on Dec 18, 2008

  • 58 Answers

SOURCE: fuel pump relay dropping out

Obvious solution might be to change the relay, however here's a suggestion. When you see the relay starting to fluctuate manually hold it in the closed position to see if car still cuts out. If it does you're more that likely looking at an ignition problem as the relay needs a signal from the ignition to let it know the engine is running. If it doesn't cut out try another relay first.

Cheers John (Scotland)

Posted on Jan 03, 2009

dezwez
  • 135 Answers

SOURCE: speedo cutting out and on low revs the engine will then cut out

speed sensor on the back of gearbox

Posted on Nov 18, 2009

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