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Home E12 E24 E28 E30 E34 E36 Z3 E39 E46 X5/E53 ALL
Ron Stygar Carl Buckland Dale Beuning Forums Help

Unofficial BMW Nav Map

Fuel Quality Switch

Position Fuel adjustent Ign adv adjustment
1 (stock) 0 0
2 + 2-4% 0
3 + 4-7% 0
4 - 2-4% 0
5 0 - 2-4 deg
6 + 2-4% - 2-4 deg
7 + 4-7% - 2-4 deg
8 - 2-4% - 2-4 deg
From digest.v7.n909 Fri Jan 9 09:18:07 1998
From: "Alan Alfano"<Alan.Alfano_at_SNET.com>
Date: Fri, 9 Jan 1998 07:54:59 -0400
Subject: Re: <M30> Motronic Fuel Quality Switch

In v07.n906, From: Andrej Gaspari <aeg_at_computer.net> >This is an outgrowth of my investigation into recalibrating the air flow
meter on my 1983 533i.

> Eric Tangen mentioned the fuel quality switch, although neither he nor I
know much about it.

>If anyone out there has an intimate knowledge (or something approaching
that, i.e, knows anything)

>of the Motronic unit and its fuel quality switch, where it is, and how
>to adjust it, please let me know. I'll add it to my summary for the
Digest.

>TIA.
>AEG

Andrej,
The following are some old postings from JimC regarding the fuel quality switch for an E30 M3.
I am not sure if these are applicable for the 1983 533i. I hope it helps.
Regards,
Alan Alfano
alan.alfano_at_snet.com

BMW CCA #30492

1988 BMW 325iX
1956 Austin-Healey 100M (2)

From: Land Shark <lndshrk_at_xmission.com>
Date: Tue, 17 Jun 1997 10:44:17 -0600
Subject: Pinging due to fuel quality on E30 M3

Here's the answer..

It's called the FUEL QUALITY SWITCH or FQS

Located inside the DME.. it was designed for this VERY situation... hence the name..

An 8 position switch (0-7), it comes from factory in position #0.. I'd suggest trying #1, #4, and then #5 in that order..

First adds fuel, next is 3.1 spark retard but no fuel and the last is fuel PLUS spark retard...

Jim

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