Gasoline engine fuel system (Audi 80 B3)

Table of contents: Air purifier ↓ Fuel system ↓ Keihin I carburetor ↓ Keihin II carburetor ↓ Carburetor 2EE ↓ Injector systems ↓

Air purifier

Type - With replaceable paper air filter and automatic air temperature control on most models.

Air filter:

Carburetor engines - Champion W102
Injection engines 1.6 l - Champion U102
Other injection engines - Champion U102

Fuel system

Fuel pump:

Carburetor engines - Mechanical diaphragm pump with eccentric drive on the intermediate shaft
Injector Motors - Electric Vane Pump

The working fuel pressure on a carburetor engine is 0.35 - 0.40 bar

Keihin I carburetor

Type - Two-barrel carburetor with downdraft and manual choke

Jets and control values	RN	NE
Fast idle	3200±200 rpm	3200±200 rpm
Accelerator pump feed	0.78:0.12 cm³/stroke	0.78:0.12 cm³/stroke
Air damper clearance	4.6±0.615 mm	4.6±0.615 mm
Idle speed	900±50 rpm	900±50rpm
CO content in exhaust	1,0-0,5%	1,0-0,5%
Air neck - chamber 1/2	20/26	20/26
Main jet - chamber 1/2	108/150	110/150
Air jet - chamber 1/2	90/120	90/120
Idle fuel jet	115	115
Needle float valve	2,5	2,5

Keihin II carburetor

Type - Two-barrel carburetor with downdraft and manual choke

Jets and control values: — RU

Fast idle speed - 3500±200 rpm
Accelerator pump feed - 9.85±0.15 cm³/stroke
Air damper clearance - 2.2±0.15 mm
Idle speed - 500±50 rpm
CO content in exhaust - 1.0-0.5%
Air neck - chamber 1/2 - 22/26
Main jet - chamber 1/2 - 100/140
Air jet - chamber 1/2 - 90/100
Idle fuel jet - chamber 1 - 50
Needle float valve - 2.5
Exhaust pipe - chamber 1 - 40
Enrichment jet - chamber 1 - 35

Carburetor 2EE

Engine:

Volume - 1.6 l
Power - 51 kW/70 hp.
Installed with - 1/87
Designation - RR

Carburetor Elements	Camera	1 Camera 2
Diffuser ∅ mm	2	26
Main jet	X105	X110
Air correction jet with mixing tube ∅ mm	X110	X105

Fuel jet XX - X45
Enrichment at full load ∅ mm — 1.1±0.1
Ventilation hole of enrichment tube ∅ mm — 0.7
Transient fuel jet - 90
Transient Air Jet - X 130
Maximum speed rpm - 7000±50

Throttle Potentiometer:

Total resistance kOhm - 1.4-2.6
At extreme positions min Ohm — ＜ 270
max, kOhm — 1.4-2.4

Throttle control:

Resistance contact 1+2/6+7 Ohm — 20-70
contact 3+4 kOhm - 1.4-2.6
contact 5+3 min Ohm — ＜ 400
contact 5+3 max kOhm — 1.4-2.4

Pre-throttle control:

Resistance between contacts Ohm - 0.9-1.7
Insulation resistance Ohm - ∞
Number of revolutions XX rpm — 900±75
CO content % of volume — 0.6±0.4

Injector systems

Engine code DZ - K-Jetronic systems

Idle speed - 950±30 rpm

CO content in exhaust - 1.3±0.2%
Raising idle speed:

Switching speed - 700 rpm
Shutdown speed - 1050 rpm

The speed at which the fuel pump switch relay operates is 6500 - 6700 rpm

System pressure: 5.2 - 5.9 bar

Fixation pressure after 10 min. of work - 3.3 bar

Engine code PS (until 1989.) and KV - K-Jetronic system

Idle speed - 750-850 rpm

Idle speed control unit current - 430-440 mA

Content in exhaust - 1.0-1.2%

System pressure: 5.4 - 6.2 bar

Fixation pressure after 10 min. of work - 364 bar

Engine code RM - Mono-Jetronic system

Maximum speed - 6300 rpm

Idle speed - 750-950 rpm

CO content in exhaust - 0.2-1.2%

System pressure: 0.8 - 1.2 bar

Fixation pressure after 5 min. of work - 0.5 6ap (min.)

Injector resistance - 1.2-1.6 Ohm

Engine code JN - KE-Jetronic system

Idle speed - 900±30 rpm

CO content in exhaust - 0.3-1.2%

Raising idle speed:

Switching speed - 700 rpm
Shutdown speed - 1050 rpm

Maximum revolutions (regulation by means of fuel pump relay) — 6270-6330 rpm

System pressure: 5.2 - 5.6 bar

Injector injection pressure - 3.5-4.1 bar

Engine code PS (from 1989) - KE-Jetronic system

Idle speed - 750-850 rpm

CO content in exhaust - 0.3-1.2%

System pressure: 6.1 - 6.5 bar

Fixation pressure after 10 min. of work - 3.4 bar

Injector injection pressure - 4.3-4.6 bar

Engine code for NG system KE III-Jetronic

Idle speed - 720-860 rpm

CO content in exhaust:

Lambda system sensor disconnected - 0.8±0.3%
Lambda system sensor connected - 0.3-1.2%

Maximum revolutions (regulation by means of a control unit) — 6500-6700 rpm

System pressure: 6.1 - 6.5 bar

Fixation pressure:

After 10 min. of work - 3.5 bar
After 12 min. of work - 3.4 bar

Injector injection pressure - 4.3-4.6 bar

Engine code FOR - KE-Motronic system

Idle speed - 780-900 rpm

CO content in exhaust - 0.2-1.2%

Current of the CO content control device is 0 - 5 mA

Maximum speed - 6300-6500 rpm

System pressure: 6.1 - 6.5 bar

Fixing pressure: