No spark

JEEP1990

MEMBER
1990 JEEP WANGLER YJ
300,000 MILES

New motor ran great for 6 months then quit. Now no spark. Replaced - distributor, cap, rotor, computer behind glove box, the thing on the fire wall bellow the battery, coil, ignition control mod and moved from under coolant overflow canister. Other then replacing all the wiring and that's expensive between $800-$1,000 not sure what too do. HELP PLEASE !

1 Reply

CARADIODOC

MECHANIC
33,879 POSTS

By now you've figured out that throwing random parts at a problem is the most expensive and least effective way to solve a problem. It would cost you much less money and time to have a mechanic properly diagnose the cause of the problem.

Since you didn't list the engine size we don't know which parts are used in your ignition system. If you have the 2.5L the crankshaft position sensor is the most likely suspect and one you didn't mention. You also need to check the diagnostic fault codes. If there are any in memory they will indicate the circuit or system that needs further diagnosis. If the battery was disconnected or run dead the memory would have been lost along with that valuable information. Here's the link to the page on reading codes in Jeeps:

https://www.2carpros.com/articles/jeep-diagnostic-trouble-codes-for-car-built-on-or-before-1995-odb1

Wiring harnesses are never replaced unless the vehicle is under warranty or a lot of wires were crushed in a crash. Cut or grounded wires are diagnosed with a few resistance and voltage checks, then they're repaired.