shut off no start

porsche944speed · 01-12-2006, 07:05 PM

I pulled in my neighborhood and rounded the turn car just died never started up after that i thought i ran out of gas.... Well i put gas in it its gettin fuel all the way up to the fuel rail it seems like it doesnt have spark if i pull the dme relay out and re insert it i can hear it clicking i am not getting any spark with new coil i have power to both sides of the coil though????? im not sure what to do next i would hate to take it to porsche in west chester pa. for something like a dme relay or something all fuses are good gas is good all wires are in tack and i was just driving normaly ive checked cap and rotor im not even gettin spark out of the coil itself

HELP and would be appreciated

SoCal Driver · SoCal Driver's Garage

If when cranking the engine it sounds more like a sewing machine you broke your timing belt.

porsche944speed · 01-13-2006, 04:52 AM

timing belt is in tact

SoCal Driver · SoCal Driver's Garage

How did you determine that? Many belts will strip the teeth and still can be wraped around the pulleys.

How did you determine you have no spark? Seldom does the coil fail on these cars. It's usually the ignition switch as it powers the coil directly. The DME relay is the second item to fail. The reference sensor follows a close third.

You need to add your model and year to your signiture line so the rest of us don't have to guess.

Basic Testing Procedure

With the key on check for voltage at the coil and at one of the plugs to the injectors.

If there is no voltage to the coil it's your ignition switch.

If there is voltage to the coil but not to the injectors it's the DME relay.

If there is votage to both pull the cable off of the first spark plug, stick a spare plug in and lay the spark plug on the intake manifold so it is grounded. Crank the car and check that there is spark. No spark is an indicator that the reference sensor is not sensoring. Can be the HV cable between the coil and the dist cap. Can be a broken OR STRIPPED timing belt as the dist rotor is on the end of the cam. Yes it can also be a bad coil. Check the resistance across the coil terminals. From term 1 to 15 you should get 0.4 to 0.6 ohms. From term 1 to 4 you should get 5.0 to 7.2 K ohms.

The reference sensor can be out of adjustment. Larger clearences can result in poor running and even spontanious stopping. Correct clearence is 0.8mm or about 1/32".

The fuel pump runs when the engine is cranking and when the engine is running. You can hear the fuel pump run for a bit after you stop cranking. It's behind the passenger side rear tire. It does NOT run with just the key on.

porsche944speed · 01-13-2006, 01:27 PM

1986 944 n/a the rotor button is spinning and the motor is not cranking quickly thas how i know its not the timing belt.. it didnt jump time is just simply quit like coil craped out or something but i need to look into the fuel injector im not sure if they are pulsing or not i havent checked them timing belt was just done 7000 miles ago

SoCal Driver · SoCal Driver's Garage

I can help ONLY IF you follow the testing plan and report back on each step. Otherwise you are just throwing parts at it.