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Home > Tips and Howtos > Benz Repair and Maintenance Tips Tips and Howtos

W126 - Bosch KE3-Jetronic Mixture Adjustment (560... [Benz Repair and Maintenance Tips]
Requested and Answered by Admin on 29-Mar-2005 03:31 (3943 reads)
W126 - Bosch KE3-Jetronic Mixture Adjustment (560 SEL , may be applicable to other post 1987 models)
Mercedes suggests that special tools are required to adjust the mixture on the Bosch KE3-Jetronic (CIS-E) fuel injection, such as is used on the 1988-91 560 series motors. The dedicated shade tree mechanic can do it, but needs to be well-informed first. These adjustments are intended to be followed by an actual exhaust gas CO check to ensure legality.

In order to reach the adjusting screw one must first remove the anti-tamper device required on US cars by Federal law. It is in a cast-aluminum tower just in front of the fuel distributor. Although Mercedes requires that it be removed and discarded, and after the adjustments be replaced by a new one, with care it can be re-used.

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