Bad misfire around 0.7 bar boost - Mitsubishi Evolution Forums: Mitsubishi Lancer Forum
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Old 09-15-2020, 06:26 AM   #1 (permalink)
dav
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Registered: Sep 2020
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Bad misfire around 0.7 bar boost

Is it possible that an Evo 7 ECU would reset to the factory flash after having the battery out of the car for too long? I assume it doesnt happen given the ECU has RAM.

I had the battery out of my Evo 7 for about a month and a half. Car was running perfectly well. Fairly standard apart from exhaust and intercooler upgrades and tuned on 1.5 bar. Ever since putting a battery back in as soon as I hit 0.7 the car starts to break up real bad. It suddenly loses power and starts to rapidly pop out the exhaust Not loud bangs like an ignition cut, more like the muffled pops you get when you have a misfire at idle. Only louder and rapid fire like a machine gun.

If I come on the throttle slowly and keep the boost low the engine is smooth throughout the entire rev range, but as soon as the boost passes 0.7bar it's bang bang bang bang and suddenly feels like it loses all power while the revs keep rising. Before the battery was out it pulled hard all the way to about 1.7bar then settled back down to 1.5 with no problems
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