Beetle L4-1.9L DSL Turbo (ALH) (1998)
Inspect ECM ground (GND) connection for corrosion, poor or no connection.
Injection pump timing, checking
Check start of injection pump timing (see Repair Group: Diesel direct injection system, servicing)
An adjustment to the upper range is advised.
Snow screen (if applicable) at intake air duct, checking
Check snow screen, located below left front fender in air duct -3-, and clean as necessary.
Inspect air cleaner element -1- for proper installation.
If air cleaner element is deformed due to improper installation, this may
cause the MAF sensor to fail.
Replace air cleaner element as necessary.
Check integrity of all vacuum hoses and connections, and repair as needed.
EGR valve and intake manifold air flap (integrated in EGR valve), checking
Remove intake hose -1- at EGR valve.
Remove vacuum hose from EGR valve -2-.
Connect hand vacuum pump to EGR valve -2-. See --> Required
Parts and Tools.