87 911 carrera will turn over but wont start.... has no spark from coil, but has 12 volts to coil with key on.

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according to my info, primary voltage to coil should go hot with key on, there is a fusible link in that circuit.

no spark could be a bad coil

run the fault codes first as there are a number of reasons for no spark --the last being the coil. There is an ignition module ---position sensors --timing belt --shorts in the cap --bad coil lead to the distributor . The ignition module may be only have 7.5 volts to it from the coil in which case you may have burnt it out with the 12 volt application and you will not get any spark unless the coil is in the circuit as it is a transformer that generates the high voltage necessary for a spark at the plugs.

Hello! Check the Red/Light Green wire at the ignition switch connector for 12 volts when key is turned to start...If 12 volts is present the Ignition Module is defective...If 12 volts is NOT present the ignition switch is the culprit...Guru...saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

A test light connected across the coil primary leads should flash on + off when engine cranks(coil sparks when 12v turned OFF due to collapse of magnetic field).If you get pulsed 12 volts,and no spark from the coil,the coil is bad.If you don't get the pulsed 12 volts,trace back to find out why(the PCM turns the coil ground on and off,12 volts comes from switched IGN source)

Engine wont start.If car battery voltage is low then engine wont start.The fully charged battery will show 12 volt.But if battery is showing 12 volt.Then check the battery to starter connection.If that is also checked ok then check voltage for starter itself.The starter is also a 12 volt part.But if the starter is faulty then it has to be replaced.If you start the car but if its not starting then its starter fault.But if the car makes cranking noise but its not getting turn over then there are many other possibilities.A car that cranks over but doesn't start, in many cases will be due to a bad fuel pump, a broken timing belt, an inoperative cam sensor or crank sensor. Also these problems are related to faulty spark plug. Check the spark at spark plugs when you start the car. Do you notice any spark. Actually you should see. If in case there is no spark then it's a spark plug problem. Also the coil pack gives power to spark plug. So check the voltage at coil pack. It will show 12 volt. If there is no voltage noticed at coil pack then its faulty coil pack that has to be replaced. If all the possible options checked out ok then check the car starter. The starter gets power from battery to start the car. If the starter is faulty then it will not let the car to start. Also check and confirm that there is fuel in the car. If its very low fuel then in some cases this causes the problem. Also check and confirm that fuel pump is functioning properly and the fuel filter is not clogged. One of the easiest ways to check for a fuel pump related problem is to spray a little starting fluid into the air intake while trying to start the car. If the car starts momentarily, then there's a good chance the fuel pump is not working or the car is out of gas. You can also listen for the fuel pump's humming sound when the key is first turned on. Also if a inoperative fuel pump is suspected, a good technician will always check to verify there is power and ground being supplied to the pump, to eliminate the possibility of a bad relay or electrical issue. Fuel pressure can be checked with a pressure gauge and if there is pressure, pulse can be checked at the fuel injectors in several ways including the most common, with the use of noid lights. If the injectors don't have pulse the engine won't start. ---------- This troubleshooting tips will help you to solve the problem. Thanks. Helpmech.

PORSCHE 911 HAS A 12 VOLT BATTERY.

First check to be sure that you have constant +12 volts to your ignition wire (red). Also be sure that there is +12 volts on the yellow wire when the key is in the start and run positions. If both of the above are true, then the problem likely exist in the ignition coil. Replace.

did the timing chain break? do you have 12 volts to the coil?is the coil bad? r u sure your not getting spark?

Dear Chuck Check the voltage to you coil. You should have 12 volts at the coil with key on. Check the same wire for 12 volts during crank. If voltage drops to 9-10 you will have "No Start". If this is what happens jump 12 volts to coil with key on. Don't worry about trying to find why the voltage was lost because the connector for that circut is lost in wiring hell. Good luck Moe