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MOTRS

E-Type

1961-1975 / Coupe / Roadster / 2+2 / United Kingdom

Common Engine

SU carburettor synchronisation issues

Symptoms

Rough idle, flat spots during acceleration, poor fuel economy, backfiring. The car runs badly and smells of petrol.

Cause

The Series 1 3.8 cars have three SU HD8 carburettors that need to be synchronised perfectly. Even the twin-SU setup on 4.2 cars is sensitive to maladjustment. Jets wear, needles wear, float heights drift, and diaphragms split. Most mechanics don't understand SUs properly and make things worse.

Fix

Strip, clean, rebuild all carbs.

Replace needles and jets.

Set float heights.

Synchronise with a proper flow meter (not just by ear).

A triple-SU setup done properly is a thing of beauty, but it takes patience and experience.

Budget $500-1,000 for rebuild kits for a triple-SU setup.

Cost mentioned in fix
Budget $500-1,000 for rebuild

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