How to Replace E36 Fuel Injectors

Written by william zane
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How to Replace E36 Fuel Injectors
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The E36 is the third generation of the BMW 3 Series. The E36 generation of cars offer strong value as second-hand vehicles. Over time, the fuel injectors wear out and develop leaks. Remove and test fuel injectors at a shop, or replace them with brand-new fuel injectors. Removing and installing injectors on an E36 is relatively straightforward.

Skill level:

Things you need

  • Rubber gloves
  • Socket set and ratchet
  • Screwdriver
  • Needle-nose pliers
  • White lithium grease

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  1. 1

    Park the car in a well-ventilated area and wear rubber gloves, as you will be working around fuel. Remove the fuse for the fuel pump, which is usually the No. 18 fuse. If unsure, consult your owner’s manual. Turn the engine on. It should turn over and then stop running. Repeat this several times to remove the excess fuel from the system.

  2. 2

    Open the bonnet. Disconnect the battery cable from the negative terminal on the battery. Remove the plastic plugs on the engine covers by prying them out with a screwdriver. Remove the bolts under the plugs that hold the engine covers on. Set the covers aside.

  3. 3

    Remove the thin plastic trim that covers the wiring harness for the spark plugs and the injectors by popping it off by hand. Remove the two bolts that hold the long, thin box in place that contains the wiring harness.

  4. 4

    Remove the retaining wires that hold the electrical connectors onto the fuel injectors by pulling them off with a pair of needle-nose pliers. Starting at the front of the car, remove all six of the wires. Remove the wiring harness bracket away from the tops of the fuel injectors.

  5. 5

    Use the needle-nose pliers to pull off the black, square-shaped clip that holds each injector to the fuel rail. The clip is C-shaped and pulls of with some effort. Remove all six clips. Remove the two bolts that fasten the fuel rail to the manifold.

  6. 6

    Pull the fuel rail off of the injectors carefully. The injectors are sealed to the fuel rail with rubber O-rings, which the rail needs to be pulled up off of. Work slowly from the rear of the engine to pull off the rail. Push the rail out of the way. Wipe up any spilt fuel.

  7. 7

    Remove the injectors from the manifold by pulling them straight up. You may need to wiggle them a little. If any of the injectors are still fastened to the fuel rail, remove them from the rail by pulling them off.

  8. 8

    Have the fuel injectors tested, cleaned and calibrated, or buy a new set of injectors. Place a small mount of white lithium grease on the fuel injector’s rubber O-ring. Install the fuel injectors by pressing them back down into the manifold. Reinstall the fuel rail on top of the injectors, ensuring that the injector O-rings seat into the rail. Replace the bolts that hold the rail on, then install the plastic clips that hold the injectors in place.

  9. 9

    Put the wiring harness bracket back into place. Reinstall the electrical connectors onto the injectors with the small wire clips. Reinstall the bolts that hold the box in place that the wiring harness goes into. Reinstall the box’s top.

  10. 10

    Start the engine to ensure that there are no leaks from the fuel rail or any of the injectors. Turn off the engine. Reinstall the engine covers. Reinstall the bolt plugs.

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