Eagle Posted Sunday at 06:01 PM Share Posted Sunday at 06:01 PM This is a technical problem, but it's outside the MJ years so I'm posting in The Pub. 2000 XJ Sport has started throwing OBD-II codes: P0303, P1294, and P1494. It runs fine with the check engine light on, and the fuel mileage doesn't appear to be affected. My reference says code P0303 is "Cyl 3 misfire." The 2000 XJ has the coil rail ignition rather than a conventional coil and distributor. I hope this doesn't mean I have to replace the coil rail assembly, but I'm afraid it might. Does anyone have access to a better explanation of what these codes are supposed to signify? Link to comment Share on other sites More sharing options...
89 MJ Posted Sunday at 06:15 PM Share Posted Sunday at 06:15 PM I looked it up quickly, and if it’s a coil, you’d need the whole rail. Could do the Viper coil mod though. Not sure on all of the codes. Did you check the plug and plug wire? Are you sure that injector is firing? Link to comment Share on other sites More sharing options...
Chad R Posted Sunday at 07:38 PM Share Posted Sunday at 07:38 PM I had a similar codes on one of my 2001 wranglers. It ran fine and I kept clearing the code. That worked for awhile till the coils died and it was running on 3 cylinders. Replaced the coil rail and plugs and ran fine after. It had 93k on it. Link to comment Share on other sites More sharing options...
derf Posted Sunday at 07:54 PM Share Posted Sunday at 07:54 PM 1 hour ago, 89 MJ said: I looked it up quickly, and if it’s a coil, you’d need the whole rail. Could do the Viper coil mod though. Not sure on all of the codes. Did you check the plug and plug wire? Are you sure that injector is firing? No wires, it's coil on plug. Once the coil packs start to go, you have to replace the whole assembly. Personally I'd go with whatever is cheaper, the viper mod or factory replacement coil pack. Link to comment Share on other sites More sharing options...
89 MJ Posted Sunday at 07:59 PM Share Posted Sunday at 07:59 PM 4 minutes ago, derf said: No wires, it's coil on plug. Once the coil packs start to go, you have to replace the whole assembly. Personally I'd go with whatever is cheaper, the viper mod or factory replacement coil pack. I see. I’ll stick with Renix haha Link to comment Share on other sites More sharing options...
derf Posted Sunday at 08:05 PM Share Posted Sunday at 08:05 PM 4 minutes ago, 89 MJ said: I see. I’ll stick with Renix haha The coil on plug was only for 2000-2001 XJs (2000-04 TJ and WJ). Before that it was still remote coil and distributor. Link to comment Share on other sites More sharing options...
Eagle Posted Sunday at 11:56 PM Author Share Posted Sunday at 11:56 PM What's the Viper mod y'all are mentioning? Link to comment Share on other sites More sharing options...
89 MJ Posted Monday at 12:15 AM Share Posted Monday at 12:15 AM Basically it replaces the coil on plug stuff with a Viper coil. It’s a coil with 6 terminals for your plug wires. Here is a video on it: Link to comment Share on other sites More sharing options...
Eagle Posted Monday at 02:10 AM Author Share Posted Monday at 02:10 AM Looks interesting. Thanks. Now I just need to figure out if the coil rail is actually the problem. Link to comment Share on other sites More sharing options...
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