Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI199590 QUATTRO SPORT V6-2.8L (AAH)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSLOCATIONSCOMPONENT LOCATIONSINJECTION SYSTEM
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
Injection System
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION Injection System
FUEL RAIL AND INJECTORS
CAUTION!
Seals must always be replaced.
1 Fuel supply line
• 25 Nm (18 ft/lb)
2 Fuel return line
• 25 Nm (18 ft/lb)
3 10 Nm (7 ft/lb)
4 Clamp for fuel pressure regulator
5 Seals
• Always replace
6 Fuel pressure regulator
• Checking system and residual pressure.
7 Fuel rail
• Also serves as retainer for fuel injectors
8 Safety clamp for fuel injector
9 Seal
• Always replace
10 Injectors
• Checking
11 Seal
• Always replace
12 Compound intake manifold
INTAKE MANIFOLD ASSEMBLY
CAUTION!
Seals must always be replaced.
1 Intake manifold upper section
2 10 Nm (7 ft/lb)
3 20 Nm (15 ft/lb)
4 Seal
• Always replace
5 Idle Air Control (IAC) valve
• Checking
6 10 Nm (7 ft/lb)
7 6 Nm (53 in/lb)
8 Flange
9 Intake manifold, lower section
10 Gasket
• Always replace
11 10 Nm (7 ft/lb)
12 Vacuum unit
13 20 Nm (15 ft/lb)
14 Throttle Body (TB)
15 Gasket
• Always replace
16 20 Nm (15 ft/lb)
17 EGR valve
18 EGR temperature sensor
• On intake manifold under throttle body
19 10 Nm (7 ft/lb)
20 Gasket
• Always replace
21 10 Nm (7 ft/lb)
CAUTION!
Seals must always be replaced.
Fuel Rail And Injectors:
1 Fuel supply line
• 25 Nm (18 ft/lb)
2 Fuel return line
• 25 Nm (18 ft/lb)
3 10 Nm (7 ft/lb)
4 Clamp for fuel pressure regulator
5 Seals
• Always replace
6 Fuel pressure regulator
• Checking system and residual pressure.
7 Fuel rail
• Also serves as retainer for fuel injectors
8 Safety clamp for fuel injector
9 Seal
• Always replace
10 Injectors
• Checking
11 Seal
• Always replace
12 Compound intake manifold
INTAKE MANIFOLD ASSEMBLY
CAUTION!
Seals must always be replaced.
Intake Manifold:
1 Intake manifold upper section
2 10 Nm (7 ft/lb)
3 20 Nm (15 ft/lb)
4 Seal
• Always replace
5 Idle Air Control (IAC) valve
• Checking
6 10 Nm (7 ft/lb)
7 6 Nm (53 in/lb)
8 Flange
9 Intake manifold, lower section
10 Gasket
• Always replace
11 10 Nm (7 ft/lb)
12 Vacuum unit
13 20 Nm (15 ft/lb)
14 Throttle Body (TB)
15 Gasket
• Always replace
16 20 Nm (15 ft/lb)
17 EGR valve
18 EGR temperature sensor
• On intake manifold under throttle body
19 10 Nm (7 ft/lb)
20 Gasket
• Always replace
21 10 Nm (7 ft/lb)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.