SEAT Workshop Service and Repair Manuals

Spray pattern and leaks checking

Special tools and workshop equipment required

t	Torque spanner -SAT 8010-

t	auxiliary measuring set -V.A.G 1594 A- or -V.A.G 1594 C-

t	Digital potentiometer -V.A.G 1630-

t	Measuring container

Checking conditions l  The fuel system pressure must be in order, checking → Chapter. Test sequence –  Remove air filter → Fig..

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

–  Pull 4-pin connector off ignition transformer -arrow-.

–  Connect digital potentiometer -V.A.G 1630-, using the auxiliary cables of -V.A.G 1594 A- or -V.A.G 1594 C- between::

Connector, contact	Connector, contact
1	2
Set connected side of -V.A.G 1630- to 15 kΩ

–  Partially separate the rigid coolant pipe from its fixing to the cylinder head (leave the flexible hoses connected). –  Remove fuel rail complete with all injectors (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 the check with the other injectors. Make sure that only the injector to be checked is connected.   Note When checking the spray pattern, make sure that only the injector to be checked is connected. –  Then check injectors for leaks. No more than 2 drops/min may leak out. If the fuel loss is greater: –  Switch ignition off. –  Renew the defective injector → Item. When removing and fitting injectors, the following should be borne in mind: t  Replace the O-rings of any joint opened (to replace the front O-ring do not remove the plastic cap on the injector head under any circumstance, place the O-ring over the cap). t  Before fitting, the O-rings should be lightly coated with clean engine oil. t  Insert injectors vertically and in the correct position into the fuel rail and immobilise with the securing clips. t  Fit fuel rail with secured injectors onto intake manifold and insert evenly.