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Old June 29th, 2016, 08:41 PM   #1
Joined: Jun 2015
From: Czech Republic
Posts: 51

Engine running rough after Rexxer flash

A time ago I bought a Rexxer Evo unit and flashed my ECU with a custom map sent to me by Rexxer. (O2 sensors and exhaust flap disconnected.) It brought a marked improvement in terms of smoothness across the poweband.

However, some 1000 km later the engine feels quite rough again. Not in the same way than before (thereís no jerkiness and no surging in low revs), but rough nevertheless. It feels like the engine vibrates although it actually doesnít, or like thereís some added mechanical friction in the moving parts.

Some days the effect is more pronounced than another, but I would say itís getting progressively worse with time.

Could it be the autoadaptive functions at work? Bad petrol? Hot weather? I will speak to Rexxer, of course, but would love to hear some internet wisdom, too. Thanks.
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Old June 29th, 2016, 10:36 PM   #2
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Joined: Jul 2014
From: California
Posts: 1,124

Could be a number of things. Could be normal wear. Chain needs lubing. Valves. Plugs. Etc.
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