aec361 Posted September 17, 2017 Share Posted September 17, 2017 Hi All I have a 1996 escort ghia 1.8 zetec engine, sometimes when I slow down at the lights or a roundabout it will cut out, but start back up straight away, it doesn't do this all the time and only after you done 10/20 miles, any ideas please?? Quote Link to comment Share on other sites More sharing options...
Paul Grainger Posted September 18, 2017 Share Posted September 18, 2017 Speed sensor on the gearbox where the Speedo connects. It produces a square wave voltage when moving. The faster you go the higher the frequency. This signal is used by the ECU to hang the revs up a bit when stopping to prevent the engine from cutting out. The usual fault with them is an internal failure which causes interference in the signal line which makes the engine revs hang up all the time giving you a fast idle speed. There are some tight gits out there that just disconnect them instead of buying a new one! Follow the cable up. It connects to the engine harness next to the brake servo. It has a three pin plug. Might be worth checking its connected first. Will not show up on a code scan as all signals or no signal are plausable to the ECU. Cheers Quote Link to comment Share on other sites More sharing options...
aec361 Posted September 18, 2017 Author Share Posted September 18, 2017 Thank Paul for your help, do you know where I can buy one from, when I look it up it just come up with Ford Focus all the time, I don't know if they are the same or not? Quote Link to comment Share on other sites More sharing options...
Paul Grainger Posted September 19, 2017 Share Posted September 19, 2017 Nope. The Focus one is different I am afraid. Not sure if the main dealers still stock them. I would speak to a good factor like Euro car parts. Failing that there is always good old ebay! Cheers Quote Link to comment Share on other sites More sharing options...
aec361 Posted September 19, 2017 Author Share Posted September 19, 2017 Thanks Paul Quote Link to comment Share on other sites More sharing options...
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