| BMW E21 Fuel System - Page 3 |
Air/Fuel Ratio Monitors  |
The K&N Air/Fuel Monitor is designed to help the performance enthusiast calibrate and fine tune the air/fuel mixture ratio. It is an invaluable diagnostic tool that has a place in everyone's tool box, or you can install it in your car to give you real-time readings. This kit continually monitors an engine's air/fuel ratio while the engine is running. It is extremely sensitive to air/fuel ratio changes and will show them instantly and accurately, within the range of the oxygen sensor.
The instrument works whether the engine is carbureted or fuel injected, normally aspirated, turbocharged, or supercharged, and at any load condition. This precision instrument also works with nitrous oxide, but will not work with diesel or nitromethane fuels. This kit comes complete with an oxygen sensor that must be installed into the exhaust system by welding. If your BMW is already equipped with an oxygen sensor, an air/fuel monitor may be purchased separately and wired into the existing electrical system. An oxygen sensor is also available separately.
Vehicles with dual exhaust systems can utilize an oxygen sensor in each headpipe or collector that is controlled by a switch that will allow each sensor or bank of cylinders to be read independently. This can show if there is a fuel distribution problem in the intake system, or pinpoint potential problems in advance. |
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PEL-SW85-2437 | Rectangle Surface mount Air/Fuel Ratio Monitor Kit, w/oxygen sensor [More Info] | $199.55 |  |
PEL-SW85-2441 | Round In Dash mount Air/Fuel Ratio Monitor Kit, w/oxygen sensor [More Info] | $206.30 | |
PEL-SW85-2439 | Rectangle Surface mount Air/Fuel Ratio Monitor Kit, without oxygen sensor [More Info] | $137.27 | |
PEL-SW85-2442 | Round In Dash mount Air/Fuel Ratio Monitor Kit, without oxygen sensor [More Info] | No Longer Available | |
PEL-SW85-2438 | KN Oxygen Sensor, replacement for air/fuel ratio monitor - single wire (includes weld-on fitting) [More Info] | $82.00 | |
PEL-SW85-2440 | O2 Sensor Plug and Fitting [More Info] | $23.60 | |
| PEL-SW85-21688 | Weld on Fitting [More Info] | $10.50 | |
PEL-SW85-21686 | O2 Sensor Plug, 18mm x 1.5
Brand: K&N [More Info] | $16.15 | |
| O2PLUG-M18-KIT | O2 Sensor Plug, 18mm x 1.5 [More Info] | $5.25 | |
High Pressure Fuel Hose |
| Old, brittle fuel hose is extremely dangerous. Renew your old hoses every couple of years, especially in light of the problems new reformulated gasoline is having with old lines. Priced and sold by the meter. |
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13-31-1-272-750-M20 | Fuel Hose, 6mm High Pressure, Priced Per Meter, As Needed
Brand: Cohline [More Info] |  |
| $6.75 | |
| N-020-281-1-M5021 | Fuel Hose, 7mm High Pressure, Priced Per Meter, As Needed
Brand: Contitech - Porsche [More Info] | |
| $10.75 | |
16-12-1-180-409-M21 | Fuel Hose (8mm ID, 13mm OD) High Pressure, Priced Per Meter, As Needed
Brand: Contitech [More Info] | |
| $9.25 | |
16-12-1-176-440-M21 | Fuel Hose, 12mm High Pressure, Priced Per Meter, As Needed
Brand: Contitech [More Info] | |
| $13.50 | |
Vacuum Hose |
| One of the most overlooked causes of fuel injection problems are cracked and leaking vacuum hoses. To ensure that your car will run well, you should replace these often to avoid troublesome headaches. Priced and sold by the meter. |
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| N-020-353-5-M5021 | 3.5mm ID, 7.5mm OD (quantity as needed, priced per meter)
Brand: Contitech - Porsche [More Info] | |
| $4.50 | |
073379-005201-M21 | 5mm ID, 10mm OD (quantity as needed, priced per meter)
Brand: Contitech [More Info] | |
| $6.50 | |
| N-020-357-1-M21 | 7mm ID, 12mm OD (quantity as needed, priced per meter)
Brand: Contitech [More Info] | |
| $6.75 | |
N-020-376-1-M21 | 9mm ID, 14mm OD (quantity as needed, priced per meter, sold in one meter sections) [More Info] | |
| $8.75 | |
| N-020-290-1-M21 | 12mm ID, 17mm OD (quantity as needed, priced per meter)
Brand: Contitech [More Info] | |
| $11.25 | |
| N-020-371-1-M21 | 14mm ID, 17mm OD (quantity as needed, priced per meter)
Brand: Contitech [More Info] | |
| $10.25 | |
