Ronnie Posted June 13, 2021 Share Posted June 13, 2021 Hello, would anyone know why my ECU isn't sending an earth from 20 to 85 b on the fuel pump relay, does it have to have a signal from one of the numerous sensors to do this, I cant get my 87 to start, turns over, spark, fuel, okay Any help would be appreciated thanks Link to comment Share on other sites More sharing options...
NigelJ Posted June 14, 2021 Share Posted June 14, 2021 I would start by replacing the DME relay, a very common source of non-starts. Link to comment Share on other sites More sharing options...
Ronnie Posted June 14, 2021 Author Share Posted June 14, 2021 Thanks, I'll try that Link to comment Share on other sites More sharing options...
Ronnie Posted June 14, 2021 Author Share Posted June 14, 2021 Not relay, reference sensor maybe? Link to comment Share on other sites More sharing options...
Nige Posted June 14, 2021 Share Posted June 14, 2021 Will the car start if you put power to the pump directly? Link to comment Share on other sites More sharing options...
Ronnie Posted June 14, 2021 Author Share Posted June 14, 2021 No, I'm going to check the injectors to see if I'm getting a pulse from the ECU, I'm beginning to have doubts about the alarm. It's a cobra 6422, where would I post on this forum for information on it, if the ref sensor was faulty would it stop the signal to the injectors, or is there a sensor that controls it, thanks Link to comment Share on other sites More sharing options...
Type911 Posted June 15, 2021 Share Posted June 15, 2021 If they are original sensors then replace them both, they have a good run if they are still working and are probably the cause of your problem anyway Link to comment Share on other sites More sharing options...
Ronnie Posted June 15, 2021 Author Share Posted June 15, 2021 Checked injector plugs for pulse on cranking, none, permanent 12v even with car off on both terminals, at a loss Link to comment Share on other sites More sharing options...
Ronnie Posted June 19, 2021 Author Share Posted June 19, 2021 Hello, checked everything on car, including earth's to dme , changed injectors, car will start on 5 cylinders and tick over, so this I think eliminates the alarm and immobiliser, push on last injector plug car stops, and will not start, has anyone ever came across or heard of this, any help would be appreciated Thanks Ronnie Link to comment Share on other sites More sharing options...
PeterK Posted June 19, 2021 Share Posted June 19, 2021 Maybe ??? Injector has an internal short, so that when you connect it, it grounds the 12V supply to the other injectors ?? Link to comment Share on other sites More sharing options...
Type911 Posted June 20, 2021 Share Posted June 20, 2021 Swap that injector over with another one to see if its the wiring or the injector itself Link to comment Share on other sites More sharing options...
Ronnie Posted June 20, 2021 Author Share Posted June 20, 2021 Hi, I fitted 6 new injectors, I actually think there was nothing wrong with originals, apart from age, both sets give the same ohms readings, I've tried swapping the plugs,my car is a 87 supersport, my friend is working on an 89 targa he is having the same problems, only his will only run on 4 cylinders, we are beginning to suspect the dme brain, any suggestions would be greatly appreciated Thanks Ronnie Link to comment Share on other sites More sharing options...
Ronnie Posted July 6, 2021 Author Share Posted July 6, 2021 Got both cars going, after market injectors, threw us, cleaned my own, started both cars, friends car has 3 bad ones Link to comment Share on other sites More sharing options...
Phill Posted July 7, 2021 Share Posted July 7, 2021 👍 good stuff you must be well chuffed. Link to comment Share on other sites More sharing options...
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