Engine - Hesitation During Cold Take Off
88audi08Applies To: 5000 TURBO 1984-1985
Subject: Engine ^ Hesitation During Cold Take-Off
Number:
88-03 September 16, 1988
Group:
25
Fuel System
Cause:
Lean fuel mixture.
Production Change:
Installation of pressure gradient switch system to engine as of
VIN: 44-FN 040986.
Service Solution:
Install pressure gradient switch installation kit P/N 447 998 217.
Pressure gradient switch installation kit (P/N 447 998 217):
Pressure gradient switch Vacuum hose, 200 mm and 300 mm long Thermo valve Sealing washer for thermo-valve Wire harness 4 hose clamps Attachment bolt Vacuum hose diagram (self adhesive label, for under hood) Mounting bracket (for pressure gradient switch) Nut Washer
CAUTION
Part numbers are for reference only. Always check with your Parts Department for latest information.
attach bracket to pressure gradient switch using large nut and spring washer install assembly to right of ignition coil bracket using supplied nut, bolt and washer (arrow) remove cap from coolant reservoir to release pressure, then reinstall
remove threaded plug (arrow) from lower left side of cylinder head (below ignition coil)
Note
Some coolant will escape. install thermo valve with copper sealing washer in threaded bore top off coolant reservoir if necessary
install 300 mm long vacuum hose to straight connection on thermo valve using hose clamp install other end of 300 mm vacuum hose to pressure gradient switch using hose clamp install 200 mm long vacuum hose to angled connection of thermo valve using hose clamp
remove plug from unused connection on one way valve (arrow) in manifold vacuum line in rear of engine compartment connect other end of 200 mm vacuum hose from thermo valve to connection on one way valve using hose clamp
remove windshield washer reservoir connect harness to pressure switch (1) route harness next to existing wiring harness behind washer reservoir (2). Tie-wrap accordingly connect other end of harness to OXS duty cycle test connection (3) reinstall washer reservoir apply new hose diagram label (Part Number 035 000 363 FQ) over existing label in engine compartment
Note
Ensure that bonding surface is clean.
Vacuum hose layout (showing the addition of the pressure gradient switch)
Engine code KH