LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Porsche >> 1985 >> 928 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - BOSCH LH >> Testing >> Test 16 >> Fuel Injectors
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Fuel Injectors

  1. If poor power output is reported (too low at full engine load), cross section size of injector pintle could be restricted by carbon. For this test the ring line is lifted and the fuel injectors held in measuring glasses with help of a new injector installed for comparison.
  2. Remove LH control unit plug. Remove plug "W" on CEB. Apply ground to terminal "W12" and 12 volts of battery voltage to terminal "W13". Bridge terminals 30 and 87 on fuel pump relay "XX". Difference between all fuel injectors must not exceed 10% by volume. If difference is exceeded, replace injectors.
scientia non olet · About LEMON Manuals