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sprinkles08
sprinkles08, ASE Certified Technician
Category: Subaru
Satisfied Customers: 21586
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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2010 SUBARU FORRESTER, WAS TOWED TO US FROM ANOTHER SHOP,

Customer Question

2010 SUBARU FORRESTER , WAS TOWED TO US FROM ANOTHER SHOP, HISTORY: CUSTOMER STATES THAT THE OUTTER BELTS FAILED WHILE DRIVING SHE DROVE IT TILL IT STOPED RUNNING, NUMEROUS JUMP STARTS AFTER ALT A/C BELT REPLACED DIDNT RUN. SHE HAD A SHOP PUT A REMANUFACTURED ENGINE IN IT SOLD BY AUTO ZONE, THE SHOP CANT GET IT TO RUN SHE NOW HAS 5700.00 IN IT , CALLED ME AT MY SHOP WE AGREED TO CHECK IT OUT ,HOW HARD CAN IT BE , WELL... IT BLEW UP THE IGNITION COIL , CHECKED TIMING ON BOTH ENGINES CORE AND NEW ONE CHECKED CAM GEARS , WILL FIRE ON ONE CYLINDER , PREVIOUS SHOP REPLACED ALL IGNITION COMPONETS TO INCLUDE COIL , WE HAVE PUT 2 ADDITIONAL COILS ON IT , WAS THINKING ECM DAMAGED DURING A JUMP ,ORDERED ONE OFF EBAY , ID MISS MATCH RE FLASHED IT WITH SUBARU SOFTWARE FACTORY DIRECT BUT NO OPPURTUNITY TO CHANGE THE VIN, NO OBVIOUS DAMMAGE TO CIRCUIT BOARD.HAVE A CODE WITH NEW USED ECM FOR ID MISSMATCH NO CODES WITH OLD ECM WILL FIRE ONE CYLINDER AND IF KEY LEFT ON BLOWS UP COIL,BILL
Submitted: 12 months ago.
Category: Subaru
Customer: replied 12 months ago.
any body?
Expert:  sprinkles08 replied 12 months ago.

Hello and welcome to JustAnswer!

If the coils are melting it's from excessive dwell. Cam timing will definitely cause excessive dwell but if the coils will fail just with the key turned on then there is a driver circuit issue. The driver on the affected coil is shorted to ground, either in the harness or within the engine controller. It's very possible that the last shop pinched a wire when the engine was installed. What you'll need to do is test both coil driver circuits for a short to ground. If ok then the problem is in the ECM, if one or both are shorted and unplugging the ECM doesn't remove the short then the issue is in the harness.

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