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Old 03-01-2021, 07:46 AM   #1
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Default engine help???

Hi guys, I have 99 sl1. Swapped in a 100,000 mile engine. Both engines had no missing before swap. Now the swapped in engine has missfire.
Getting P0304. Swapped coils and wires from old engine. That didn't solve. Any help? THanks!
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Old 03-01-2021, 08:42 AM   #2
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1999 SL2
1998 SC2
Default Re: engine help???

How is your wire routing? Here is a pic from fetchitfido:

If it is not coils, wires, or plugs then I'd pull off and clean the ICM and mounting pad. Plus that will cycle the ICM connector.

How is the compression on #4?
Bryan Cotton
'99 SL2, 5SP bought new
Rebuilt at 204,067 September 2017
Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on!
'98 SC2, 5SP bought 2018

Last edited by Waiex191; 03-01-2021 at 08:44 AM. Reason: Picture was bad
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Old 03-01-2021, 09:18 AM   #3
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1995 SL1
Default Re: engine help???

Compression test would be first order of business.

Then check for vacuum leak around the intake and injector.

'95 SL1 725k and counting
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