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Hi I have an astra 1.4 merit. while stood at the lights or a junction it will cut out. all the lights come on. will turn over great, but will not start. there is power to the plugs, fuel and air. if I leave it for about twenty minutes it will fire up as sweet as anything then drive for maybe a couple of weeks befor it does it again. i have tried reading the fault codes, but the only code i get is 12 (the start code for reading), then nothing, it just keeps repeating the same code (12). can anyone help. thanks. barry.
Edited by Dynamic Dave on 16/11/2007 at 10:16
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fuel injection temp sensor is a common fault on this vehicle how ever you will be very lucky to get this as a fault code, i am assuming that this is a eight valve engine its is located rear of the manifold lefthand side as you look at the engine it will be blue in colour and will have two wires pluged into it, easy to change if you are a little handy with a spanner, best done with engine cold , let any pressure in the cooling system out by removing rad cap, replace cap, then disconect multiplug wire, undo sensor, fit new one, reconnect, top up coolant (will lose a little unless you are quick) and away you go. as to a reason as to what happens is that the temp sensor very briefly go's short cicuit the ecu reads this as a very cold engine (seen -40) dumps loads of fuel in and floods engine this will cause it to stall, it will restart later as the fuel will evaporate due to the heat soak within engine hope this helps
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thanks for that. I will try that as soon as I can get another sensor. will let you know how it goes. barry.
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if it happens again before you get a sensor you could prove a point by cranking the engine over with the throttle nailed to the floor it will need quit a lot of cranking but eventually it will start to catch (ie fire) and you will need to feather the throttle abit untill it is running smooth this will either prove or disprove that the sensor is at fault
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Hi
It?s not going to be the temp sensor as you have said not power at the plugs there is no way a temp sensor would do this. It would alter the fuel and slightly timing making it stall or flood but not cut out the spark.
It is more likely the distributor as this controls when the coil produces a spark and when the injector injects fuel. I assume this is what you are saying when you say you have not spark or fuel by that you have checked that there is no spark and the fuel injector is not injecting fuel.
If however you have not checked then the above post could be correct and it is just flooded.
Nice easy test is when it next cut out and you have no spark or fuel injecting pull the plug off the distributor and with a pin short out the centre pin of that plug to earth (body of the distributor) if each time you short it (with the ignition on) you should get a spark and the fuel injector will inject fuel. If it does but you have nothing with it plugged in and turning it over on the key, the distributor is your fault.
You can also test if it?s the temp sensor on the older ones because it you unplug it it?s full cold sort the two pins with a pin is full hot. Never ones are smarter and it will just flag codes but yours you will be ok.
Post back with your results or if you need more help.
Regards,
Merlin
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it says power to plugs, thats why i posted the reply that i did
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HI, removed the coolant sensor and tested it for readings as per web site I found. seems ok. took car for test run, yep it broke down again, twenty mins later it fired up ok. Will get one tomoz as the site reconed they are about £20:00 from dealer. will let you all know what happens next. thanks for all your help so far. Barry.
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so it does sorry
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i have spent a lot of time watching these sensors as live data and you have to be very lucky to catch them out but its a place to start
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just to keep you up to speed. got a new sensor on monday, fitted it. I know its early days yet, but does the car feel different to drive now? smoother maybe? or is it just in my head? so far i have done a lot of stop and start's without any sign of trouble. will keep my fingers crossed and my hopes up. thanks for all your help so far. Barry. p.s. will let you know in a couple of weeks if all is still well. you will know if its not. boo hoo.
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Just to let you know, the car has not stopped once in the last two weeks. I am keeping my fingers crossed at the moment, but i belive you may just have solved the problem for me. I would like to thank you all for your help and advice. big respect to you all. I will proberbly only come back with a deffinate after a few more weeks. Thanks again, its good to know there are people out there that are willing to share their knowlage for no other reward than a BIG THANK YOU. barry.
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Just to let you all know. the car as far as i am concerned is now fixed. that sensor must have been the problem. thank you all who helped sort it out. barry.
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glad to help, nice to get some feedback
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