First let me say I don't know any of the technical terms used by those "in the know", so please bare (bear?) with me. A few days ago a friend (who is not a mechanic, but has rebuilt multiple VW's of his own) replaced my spark plugs. After he finished the car wouldn't start. He went over what he had done & everything seemed in order. Then he thought by the way it sounded that maybe it was a problem with the battery or perhaps the starter (it would click, but won't "crank?"). Checked the battery - is okay... Checked the starter - it was in bad shape.... Replaced the starter & still the car won't work! Is there something he could have done when changing the spark plugs that would cause this problem??? Please help - I don't want to have to pay to have it towed to a mechanic if it's something simple he or my husband could easily fix.
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did you replace the ECu with a used one or new. if it a used one did you match it to the old.why di you change the ECU.? when you turn the key in the start position does the fuel pump turn on? does it crank? do you know if there is spark if you pull one spark plug wire?
Technically if the engine has compression, is getting spark at the right time and fuel, it should start. Have you checked the spark plugs to see if they are fuel or oil fouled ? Are you getting spark at the plugs or at the coil ? Have you tried using carb cleaner or starting fluid in the throttle body ?? Have you checked fuel pressure to see if you are getting enough fuel to the injectors ?
I don't know much about these but on my daughters 1.0i polo I had to reset the throttle with a computer after disconnecting the battery for a while. If you are sure you have a spark and fuel getting to the plugs then the fault will lie with timing and fuel mixture.
This has a coil pack and four spark plug wires, correct?
If so and you have replaced the spark plug wires and you don't have any spark out number four but you have spark on number one than you have a bad coil. You can remove the number four wire from the coil start the engine. Use. Test light connected to ground and place it near the opening in the coil that the spark plug wire goes into. You should see a sharp strong snappy spark. You may find that you have to hold the test light really close to the metal part inside the oil tower to see any spark.
If this is the case you have a bad coil.
Be careful when checking for spark. There is between 30 - 40 thousand volts generated but the merge is extremely low. If you get zapped it's going to tickle. Bit but it won't kill you.
Good luck and let me know what you find.
when you have your hood up in the air can you hear the starter trying to make a clicking sound or no sound at all with the starter ? Starters also go bad too and some times it is intermitten some times as well. You can use a multimeter if you know how to use one that you can use one to test the starter red hot plug from the battery to it.
you are not getting spark to the plugs, forget the codes for now, get an inline spark tester and check all plugs and wires, i say forget the codes cause till the engine runs the codes won't be accurate and the ecm does not control spark just the timing