Need help 1992 ford thunderbird sc 3.8 supercharged getting code 215 primary coil failing checked coil ohms are to spec what do i check next

Whats the code u are getting, and what did u tried so far Let me know if u still need help . First thing u need to try is take all spark plug wires out and inspect if they are ok take ignition coil out check that for cracks , if there is no cracks check coil with multi meter for ohms primary and secondry ohms let me know if u have not checked that i can tell u how to do it if dont know

That coil is out of specs. I would think it needs replacing. Change it out and let us know if problem persists.

change your coil

It sounds like you know what you're doing. The two things I did not see covered are: do you have fire at the spark plugs: you checked the efi fuse but I see no indication that fuel to the cylinders has been verified. Have you pulled a spark plug to see if fuel is reaching the cylinders?

If you suspect a malfunctioning ignition coil, check the resistance of primary and secondary windings. Do this when the coil is hot, and again when it is cold. Also measure from the case to each connector. The primary windings should have a very low resistance, typically from a few tenths of an ohm to a few ohms. The secondary windings have a higher resistance, typically in the 10,000 to 13,000 ohm range. To get the actual figures for a specific coil, check the manufacturer's specs. But as a rule of thumb, primary windings range from a few tenths of an ohm to a few ohms, and secondary winding may be 10 ohms or more.

With an OHM meter to check the resistance

Contributing Member

Join Date: Jul 2003 Location: Montreal, QC Canada Posts: 8,805 So you got codes P0300, P0304 and P0305

You need to check primary and secondary resistences, not just primary as you did.
Primary = 0.67 - 1.05 ohms (You may have a bad multi meter if all read the same)
Secondary = 9.3k - 16k ohms Contributing Member

Join Date: Jul 2003 Location: Montreal, QC Canada Posts: 8,805 So you got codes P0300, P0304 and P0305

You need to check primary and secondary resistences, not just primary as you did.
Primary = 0.67 - 1.05 ohms (You may have a bad multi meter if all read the same)
Secondary = 9.3k - 16k ohmsSo you got codes P0300, P0304 and P0305

You need to check primary and secondary resistences, not just primary as you did.
Primary = 0.67 - 1.05 ohms
Secondary = 9.3k - 16k ohms

check the fuel pressure regulator and the oil level.

how did you check coils you can ohm them and they all should read the same... another way if you do not have an expensive scanner you can scope the current draw of each coil....or simply go to junk yard ...rob a set of coils and change all... do yourself a favor change plugs to standard autolite plugs.. let me know

I just worked on 98 expedition 5.4l had code PO354. This code refer to an open primary coil winding, open wire, or bad PCM.
Check primary winding with ohm meter should be from 0.5 to 1.5 ohms and about 2.5 ohms with a hot engine. check wiring with a noid light, run the engine and shake the harness if light goes out repair harness you should have battery voltage with key on the computer controls the ground side.

No fault checking of almost anything, especially an ignition system, can be done without checking circuits and coils with a test lamp and a good ohm meter.

It is also a big help to have a circuit diagram - making it easier to know what should be happening.

Back to basics and systematic checking is the way forward...