SEAT Workshop Service and Repair Manuals

Jet profile and leakage: testing

Special tools and workshop equipment required

t	Torque spanner -V.A.G. 1331- (5...50 Nm)

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

t	Digital potentiometer -V.A.G. 1630-

t	Measuring glass

Test condition l  The fuel pressure should be OK, test → Chapter, Fuel pressure regulator and retaining pressure: testing. Test process

–  Remove the camshaft housing cover -arrows-. –  Remove the air filter → Fig..

–  Detach the 4-contacts connector from the coolant temperature sender -G62- with the sender for coolant temperature gauge -G2--arrow-.

–  Connect digital potentiometer -V.A.G. 1630- to contacts 1 + 3 of the connector, using auxiliary leads of the -V.A.G. 1594 A-, and set the connected side to 15 kΩ.

–  Remove the vacuum hose from the fuel pressure regulator -arrow-. –  From the intake manifold, remove the fuel distributor complete with all the injectors (the fuel hoses remain attached) → Item.

–  Place a small recipient under the injector to be tested and remove the connectors from the other injectors. –  Have another person operate the starter motor. The injector jet should pulsate. –  Repeat the test at the other injectors checking that only the injector to be tested is connected. –  Next, test the injectors for leakage. Not more than 2 drops/min should escape If the loss of fuel is greater: –  Switch off the ignition. –  Replace the faulty injector → Item The injectors are installed in the reverse order, taking into account the following: t  The O-rings of all the injectors must be replaced and the new ones lubricated with a bit of clean engine oil. t  Position the fuel distributor with the injectors immobilised on the intake manifold and bolt it evenly.

–  Plug digital potentiometer -V.A.G. 1630- into the connector contacts with auxiliary leads -V.A.G. 1594 C- and set the connected side to 15 kΩ.

► 11.99	12.99 ►
Contact 1	Contact 3
Contact 3	Contact 4