Sunday, 6 December 2020

BMW Bosch Fuel Injection System Trouble-Shooting Guide

SYMPTOM:PROBABLE CAUSE:
No cold startFuel-pump fault or clogged fuel-filter
Additional air-valve not opening correctly
Start-valve not opening correctly
Leak in fuel system
Throttle-valve plate not opening correctly
Temp.-sensor fault
Diode-relay fault
Poor hot startAs above then:
Leaking / faulty injector
Heat/time switch fault
Poor idleBaffle-plate stop wrongly adjusted
Leak in Vacuum-system
Fuel-filter clogged
Mixture-adjustment incorrect
Backfire from engineWeak fuel mixture
Fuel pressure too low
Starter-valve leaking
Engine runs on after shut-offLeaking / faulty injector
Stiff/stuck baffle-plate
Stiff/stuck control-plunger
Excessive fuel consumptionControl pressure too low
Starter-valve leaking
Leak in fuel-system
Fuel mixture too rich
Heat/time switch fault
Idle-speed too highControl pressure incorrect
Additional air-valve stuck open
Baffle-plate stop wrongly adjusted

Detailed maintenance guide / diagrams in this post [L-Jetronic] - https://www.beemerlab.org/2020/03/bmw-bosch-l-jetronic-fuel-injection.html

Bosch K-Jetronic injection-system overview / diagram here - https://www.beemerlab.org/2019/11/e21e12e28-bosch-k-jetronic-fuel.html

Bosch L-Jetronic injection-system overview / diagram here - https://www.beemerlab.org/2019/11/e30e28e34-bosch-l-jetronic-fuel.html

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