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[SOLVED] E91 N43 Engine malfunction - reduced power after ISTA-P 3.59.2.001 flashing
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03-08-2018, 00:03 AM,
(This post was last modified: 03-08-2018, 01:37 AM by HestonDiag.)
Post: #35
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RE: [SOLVED] E91 N43 Engine malfunction - reduced power after ISTA-P 3.59.2.001 flashing
The problem is chain guides break on the N43 and bits of plastic end up in the sump. In some cases these bits end up blocking the oil pickup meaning there is oil running round the engine but pressure a bit low. The vacuum pump is one of the last bits to be lubricated, so this issue can end up in a reduction of available vacuum. Cars with manual gearbox already have a vaccum sensor fitted as part of the start-stop system. This is so if the car is stopped and the footbrake is repeatedly applied causing available vacuum to drop too low, the engine will start automatically to make sure brake vacuum assistance is always available. Automatic cars didn't have this sensor from factory but the quality enhancement campaign involves fitting this sensor to automatic cars for free, and reprogramming auto and manual cars. The software update adds functionality to detect if the vacuum pump is not performing as required so it can display a warning to the driver. Also a check is performed to see if the chain has stretched and I've heard of cases where everything has been replaced for free on cars well out of warranty.
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