SEAT Workshop Service and Repair Manuals > Leon Mk1 > Power unit | 4 Cylinder (1.4 l., 4 valve) injection engine | Mixture preparation system, electronic inj.,Gas

Injectors: checking

Jet projection image and seal: checking

Special tools and workshop equipment required

t	Torque wrench -SAT 8010-

t	Measuring tool set -VAG 1594C-

t	Digital potentiometer -VAG 1630-

t	Measuring container

Test requirements

l	The fuel pressure must be in order, checking → Chapter.

Test sequence

–	Remove the engine protection along with the air filter (engine identification letters AUB, BBY, BBZ, BKY) → Chapter.

–	Remove the air filter housing (Engine identification letters BXW) → Chapter

–	Pull 2-pin connector off coolant temperature sender -G62--arrow-.

–	Connect the digital potentiometer -VAG 1630- to pins 1 + 2 of connector, using auxiliary cables from measuring tool set -VAG 1594C-, and adjust the side connected to 15 kΩ.

–	Unclip the wiring harness for the injectors from intake manifold and thermostat housing.

–	Remove fuel rail complete with all injectors from cylinder head (fuel hoses remain connected) → Item

–	Hold a small container under the injector to be checked and pull connectors off all other injectors.

–	Have 2nd person operate starter. Injector must spray in pulses.

–	Repeat check with other injectors ensuring that the injector to be checked is the only one connected.

–	Then check injectors for leaks. No more than 2 drops/min may leak out.

If the fuel loss is greater:

–	Switch off ignition.

–	Renew defective injector → Item.

Installation of the injectors is carried out in the reverse order to removal, observing the following:

t	Renew O-rings on all injectors and lightly moisten with clean engine oil.

t	Insert injectors vertically and in the correct position into the fuel rail and secure with retaining clips.

t	Fit fuel rail to the cylinder head with all the injectors correctly placed and bolt uniformly.

SEAT Workshop Service and Repair Manuals