Thread: Sick L98

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I'd agree with Mr. Spears, easiest things to check are the grounds, they are crucial to complete the circuit and often overlooked.

You can use a jumper cable right from the battery (-) to a clean metal spot on the motor and see if the motor runs without interruption. Quick and easy way to test.

Well, here's a few more data points. When I said the engine runs after reconnecting the EST bypass that was telling only a part of the story. Here's some more detail. With the EST bypass disconnected I set the timing to about 12° BTDC and the engine would start nicely and run good for 5-10 second and die. While watching the timing mark it is clear that the spark stopped right before the engine quit. So I reconnect the EST bypass and now the engine will stay running if you feather the throttle BUT it is backfiring through the exhaust and the timing is now off scale at about 16° ATDC. All components inside the distributor are new including coil and cap. Disconnecting the EST module does not change a thing. I've gone through all the grounds and they are good. New computer - same same. Should I rip out the damn tuned port and put a carb on?

Well, here's a few more data points. When I said the engine runs after reconnecting the EST bypass that was telling only a part of the story. Here's some more detail. With the EST bypass disconnected I set the timing to about 12° BTDC and the engine would start nicely and run good for 5-10 second and die. While watching the timing mark it is clear that the spark stopped right before the engine quit. So I reconnect the EST bypass and now the engine will stay running if you feather the throttle BUT it is backfiring through the exhaust and the timing is now off scale at about 16° ATDC. All components inside the distributor are new including coil and cap. Disconnecting the EST module does not change a thing. I've gone through all the grounds and they are good. New computer - same same. Should I rip out the damn tuned port and put a carb on?

Mr-Natural, everyone else may recognize "EST" but it's Greek to me. I have absolutely no idea what you mean by "EST Bypass". If you use an acronym it would really help if you'd define it at least once. IMO a good EFI system is an improvement on a carb, but I'd say that for me it makes sense to go with one of the new aftermarket, self learning systems as opposed to trying to band aid an OEM system.

I wish you the best figuring out your system, and truly hope that you get it sorted out.