SEAT Workshop Service and Repair Manuals

Checking injectors Checking spray pattern and for leaks

Special tools and workshop equipment required

t	Dynometric key -V.A.G 1331- (5...50 Nm)

t	Auxiliary measurement set -V.A.G 1594 C-

t	Digital potentiometer -V.A.G 1630-

t	Measuring glass

Test conditions l  The fuel pressure must be in order, checking → Chapter, checking fuel pressure regulator and holding pressure. Test sequence –  Remove air cleaner → Fig..

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

–  Pull the 4-pin connector off coolant temperature sender -G62- with coolant temperature gauge sender -G2--arrow-.

–  Connect digital potentiometer -V.A.G 1630- using aux. cables from -V.A.G 1594 C- to connector contacts 1+3 and set connected side to kΩ.

–  Pull the vacuum hose off fuel pressure regulator -arrow-. –  Unclip injector wiring harness from fuel rail. –  Remove fuel rail, complete with injectors, from cylinder head (the fuel hoses remain connected) → Item.

–  Hold a small container under the injector to be checked and pull connectors off all other injectors. –  Operate starter, using a 2nd person. Injector must spray pulsatingly. –  Repeat check with other injectors ensuring that injector to be checked is only connected. –  Switch off ignition and afterwards check injectors for leaks. No more than 2 drops/min may leak from each injector. If the fuel loss is greater: –  Switch off ignition. –  Renew defective injector → Item. Perform installation of injectors in reverse order. When doing this note 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  Place fuel rail with secured injectors on cylinder head and press in evenly.