Car stops at random

Thank you for your answer. I checked out the ignition switch wiring all good and no loose plugs and wires. So in back to square one. Would there be a problem with the ECU relay? I have checked most of the wiring and plugs under the bonnet this one has me stumped. It just started out of the blue. Any other ideas? Thank you again

Hi there again, it shuts off and just like you turned on the ignition to start up the vehicle then the engine light goes out like the rest of the lights. Still no codes are coming up from the ECU. The strange thing is that it starts up like normal the next day. I had it running for 5 hours on the weekend but it did not stop. Pulled on every wire I could get hold off and check all the sensor plugs and nothing again. Very strange one don’t you think? Thank you for your reply too.

Hello again Alex, I have cleaned the battery terminals and pulled out the battery and cleaned the earth strap all clean there was no corrosion on the terminals. I started the car with in minutes the rpm jumped up to 3000 and racing. I disconnected the idle solenoid the revs dropped back to normal. When I plugged the sensor back in it was racing again. I did fit a new idle sensor
with the motor racing if you rev the motor it hesitated due to the idle sensor, before the motor cuts out driving I noticed most times the rpm was up around 3,000 then it starts mucking up and stopping. It has got a mind of its own. What now? Thank you again for all your help.

Sending you a photo of the sensor I replaced last week. Thank you again.

Thank you again. I drove the car into work this morning it did start mucking up with the high reeves about 2 minutes drive from home but it kept going.I think because it’s showing and codes it must be some sort of electrical problem. Thank you again Alex.

Hi there Alex, I have just checked my car to work again, when I started it the idle was very high, I pulled the plug on the idle air control valve and the idle went back to normal, something is telling the idle control air valve to open up more than normal and you can really hear the air rushing into the inlet manifold then it goes back to normal idle when it feels like it, and at no time has the engine warning light come on, hope this helps you, thank you again

Hi there, again the MIL goes out when car starts does not illuminate once car is running. But I have scanned the ECU in the passed few weeks no codes are coming up. That’s why it may be a electrical problem which I found out from Hyundai only picked up the electronic goods.

Thank you for all that information. I have also added a few extra earth straps from body, battery to different locations on the motor to see what goes on with it on the way home. I will get back to you in regards the the tests on my wires and connectors. Thank you very much again Alex.

Hello again my helpful friend, I have some good news I think the extra earth straps worked. My car went well all afternoon, so I think I have to check one of the earth leads one was under the battery tray which I cleaned up and the other goes into the main harness. As soon as I get time I have to find out where it goes to. I don’t recall seeing it when I have been working on the motor. It may even be disconnected or faulty. I will let you know how I go as soon as I check it. The idle was good all afternoon. I did fit 4 extra earth straps on my lunch break at work. Could this have been causing the staling and idle air control going crazy? Thank you again. I will let you know how I go with the harness earth strap soon. Thank you again

Hello again Alex thank you for your reply. All is good so far. I still have to find the main harness earth lead to see what’s up with it and weather it’s connected at all. I will let you know as soon as I find it and check the cable. Thank you again and will be in contact soon. Keep up the great work you are a life saver. Thanks again. Regards, Petar

Hi there Alex, would you have a wiring diagrams of at earth straps in the engine bay? Thank you

Hi Alex just a quick update.

I have now found out my AC, cruse control, AC thermo fan and not sure what else is not working now. I checked my thermo fan this afternoon and found there was no earth to in the wiring connected a new earth lead and the fan works now. Are all these items tied together somehow? The motor has not stopped working fine but still seems to be a earth problem under the bonnet. I have not got to the other items that are not working yet. Will try running direct earths the them and see it it gets them working. Any ideas from your end about this problem now? Thank you again for all your help with my problems.