Home1990-1998 3 Series (E36)BMW E36 Cold Air Intake Installation with ASC Delete - 1990-1998 3...

BMW E36 Cold Air Intake Installation with ASC Delete – 1990-1998 3 Series

This article is certified AI Free. All of the following content is original. It is neither AI generated nor AI enhanced. It was researched and written by humans exclusively for the BMW Repair Guide. For more information on the AI Free Zone, please click here.
Affiliate link disclosure – The BMW Repair Guide uses affiliate links in their site. For more information on affiliate links, please click here.
Repair Summary
The following article gives detailed instructions on installing a performance cold air intake into your BMW E36 3 series car. Even though we have used a 1996 BMW E36 M3 to perform this installation, this article can be applied to any BMW E36 with a six cylinder engine manufactured from 1990-1998, including the 323i, 325i and 328i models with minor modifications.
E36 3 Series 316i
E36 3 Series 318is
E36 3 Series M3
E36 3 Series 320i
E36 3 Series 325i
E36 3 Series 325is
E36 3 Series 323i
E36 3 Series 328i
E36 3 Series 318i
E36 3 Series 323i 2.4
E36 3 Series 325td
E36 3 Series 325tds
E36 3 Series 318tds
E36 3 Series 316i 1.6
E36 3 Series 323ti
E36 3 Series 318ti
E36 3 Series 316g
E36 3 Series 316i 1.9

A BMW E36 cold air intake with ASC delete is the quickest way to add horsepower and an intimidating sound to your BMW E36 engine.

Probably the biggest question that plagues BMW E36 owners is how to gain more horsepower from their engine without spending a fortune. After getting humiliated in our beloved BMW Repair Guide 1996 E36 M3 at a recent track event (by a new Suburu STI nonetheless), we decided it was time to let go of our purist values and start making some engine modifications.
Our goal: how could we produce affordable horsepower using easy-to-install parts that were reversible if we decided to return the vehicle to its original specifications? The quickest solution was to get a higher flow of oxygen to the cylinders by installing a BMW E36 cold air intake and deleting the vehicle's Automatic Stability Control. Adding a new high-volume silicone intake boot would complete the improvements. Sounds difficult? Not at all. It can be easily done in your garage without the need of hiring an expensive mechanic.
The stock airbox and air filter on a BMW E36 3 series car are power-robbing parts that deprive your cylinders of precious oxygen needed to produce power. It's a simple fact that pumping more air into your engine produces more power. But adding a BMW E36 cold air intake is worthless if the increased airflow you are producing is restricted or impeded. That is where the ASC delete comes into play.
The BMW Active Stability Control system was developed as an early stability/traction control for vehicles and has since been replaced by more sophisticated systems. In general terms, BMW's ASC is a secondary throttle body that is controlled independently of the main throttle body. Unlike your main throttle body which is controlled by your foot pressing on the accelerator, the ASC throttle body is controlled by your BMW's DME (your engine's computer module). The ASC is installed so air must first flow through it before it enters the main throttle body. When the car senses a loss of traction the ASC throttle body will close, shutting down power to the engine (regardless of what the driver is doing with their foot on the accelerator) until traction is regained. The problem with the ASC is that it restricts the amount of air entering the engine...even when it is in the open position.
To truly gain the full performance of a BMW E36 cold air intake, the ACS throttle body must be removed and the stock intake boot replaced with a high-performance silicone version. And as stated earlier, all of these changes are completely reversible if you wish to return to your stock configuration...just make sure to keep your parts.

What brand cold air intake should I install?

As is with most aftermarket performance parts, that question is dependent on many factors. If you are modifying your car for your own personal driving enjoyment without any intention of entering it into a car show or selling it as a high end restomod, you really only need to answer two questions: how much will my budget allow me to spend, and is the intake manufactured by a reputable company with a history of producing high-performance racing parts.
Since our budget was around $500, our choice without any hesitation was the AFE Power Magnum FORCE Air Intake System with a Mishimoto silicone intake boot. In fact, even if our budget ceiling was $1000, we would have purchased the same system. AFE Power is a proven brand that has been used by many race teams including one of the Repair Guide's favorites...Turner Motorsports. Mishimoto is also a proven brand used on countless race cars around the world. Together they create an awesome setup for about five hundred bucks. AFE makes both an oiled and dry intake filter for the Magnum FORCE Pro...they both work equally well and it's just a matter of personal preference.
View the detailed parts diagram for this repair.
Includes detailed part diagrams, part numbers and links to purchase all of the required components needed to complete this repair.
Section 1 - Preparing the Vehicle for Installation
  Preparing the vehicle for installation includes removing the stock air intake assembly and the Active Stability Control throttle body.  
  1. Loosen the front left headlight by removing the four 8mm bolts. Three of the bolts are on the front of the frame...the fourth is behind the light near the radiator. A neat trick is to insert a little blue tape at the end of your socket...this will help you get the fourth bolt out without dropping it. When the bolts are removed, pull the left yellow parking light out and rotate the headlight enough so you can get behind it. You do not need to remove the headlight completely (see image)BMW E36 cold air intake - remove left headlight.
  2. Take out the stock air box (air filter) assembly from the vehicle by removing the two 10mm bolts and unclipping it from the MAF. These are expensive parts that are becoming more difficult to find, so we would suggest storing in the event you revert back to a stock configuration some day (trust us...you will curse yourself if you don't). BMW E36 cold air intake - remove factory air box
  3. Unplug the wiring connector from the MAF (Mass Air Flow) sensor. Loosen the hose clamp that connects the MAF to the stock intake boot, then remove the MAF from the vehicle. Be careful with the MAF...it is a precision part that will break if dropped. Store in a safe place until reassembly.BMW E36 cold air intake - remove factory intake boot
  4. Loosen the hose clamp that connects the stock intake boot to the ASC throttle assembly. There is a hose that is attached to the bottom of the stock intake boot; this is the ICV (Idle Control Valve) hose. CAREFULLY remove the hose off of the stock intake boot then pry loose the plastic hose connector. We say "carefully" because you want to avoid any breaks in the hose connector or tears in the hose. We will be using the stock hose and connector again during reassembly.Active Stability Control throttle body
  5. Remove the throttle cable from the top of the ASC throttle body. The throttle cable removes very easily; just create slack in the cable by "closing" the throttle plate then pop the cable loose (see image below). Tuck the throttle cable neatly away (next to the brake fluid reservoir is a nice spot) if needed in the future.BMW E36 cold air intake - disconnect the ASC throttle cable
  6. Unplug the wiring connector from the ASC throttle body and tuck away with the throttle cable for future use if necessary. Remove the throttle body's two mounting bolts. Grasp the ASC throttle body and remove from the vehicle, along with its rubber gasket. Once again, this is an expensive part that we suggest storing away (with the mounting bolts...just tape to side) in case you want to revert back to your stock configuration some day. BMW E36 cold air intake - remove the ASC from vehicle
Section 2 - Performance Silicone Intake Boot Preparation and Installation
  1. Preparing the intake boot for installation - there are two vacuum ports on the bottom of the intake boot. Since our BMW E36 only uses one vacuum port for the ICV (Idle Control Valve) hose, the other port will need to be plugged. It is very important that the correct port is plugged so the ICV hose fits in the next step. You will need to plug the port closest to the main throttle body. Insert the plastic ICV hose fitting in the remaining second port - swivel it till it's pointing towards the rear of the vehicle. BMW E36 cold air intake - prepping the new silicone bootDouble check the location of the ICV port
  2. Install the ICV hose to its plastic fitting on bottom of intake boot. Even though the fitting is "barbed" for a pressure fit, we like to add a hose clamp for added security. Tighten ICV hose clamp securely. Slide the large hose clamp from the stock assembly onto the end of the Mishimoto boot and attach to the main throttle body. DO NOT tighten any hose clamps yet. Everything (except the ICV hose clamp) will be tightened down at the end of the installation.BMW E36 cold air intake - install the ICV hoseBMW E36 cold air intake - install the new silicone boot
Section 3 - Performance Cold Air Intake Prep and Installation
  1. Prepare the AFE Magnum Force intake for installation by assembling exactly as shown in the following images; make sure the filter hose clamp is positioned as shown so it can be tightened after installation. If you read the assembly instructions included with the intake, you may notice there is one major difference between ours and theirs; we mount the intake pipe assembly to the inside of the heat shield...not the outside. This will allow just enough space to fit the Mishimoto boot and allow the mounting holes to line up. Do not tighten any of the nuts or the filter hose clamp yet.BMW E36 cold air intake - prepping the new cold air intakeDo not tighten any bolts yet
  2. Install the rubber reducer (included with your AFE intake) into the end of the intake pipe as shown in the following images. This reducer is needed so the stock 3" MAF will fit snugly. If your car is equipped with an aftermarket 3.5" euro MAF, the reducer won't be needed.BMW E36 cold air intake - install the rubber reducer for a 3 BMW E36 cold air intake - rubber reducer installed
  3. Install the MAF into the silicone intake boot, then maneuver the cold air intake assembly into place in the engine compartment. It helps to tilt the front end of the assembly down when installing.BMW E36 cold air intake - install the cold air intake into the vehicle
  4. Connect the MAF to the BMW E36 cold air intake assembly. Now you can "tweak" all of your connections to make sure everything lines up nicely. The AFE intake assembly should fit snugly in the engine compartment with the cone facing down and clear of any obstructions (see image below). There may be very slight pressure between the assembly and the top radiator hose; this is perfectly fine as long as it is not pinching the hose.cold air intake installed
Section 4 - BOW Cold Air Intake - Final Assembly
  1. Insert a bolt with two washers in right cruise control mounting bracket. Hand tighten only. If your car has cruise control like ours, note the mounting location of the module in the image below.BMW E36 cold air intake - reinstall the cruise control module
  2. The final mounting bolt is, as with all repairs, the hardest to install. Please use patience in getting it in. If you get upset trying to install it...walk away for 5 minutes and try again. It is located behind the front right headlight that we removed in Section 1 of this article. There is a small white plastic spacer that should have been included in your AFE intake kit...this spacer must be installed between the steel headlight frame and the cold air intake heat shield. When you have the spacer in place, install a bolt with two washers and hand tighten.BMW E36 cold air intake - heat shield installationHeat shield installation
  3. Tighten all of your bolts and hose clamps. Be careful not to miss any. We started at the front of the intake and made our way back to the throttle body. It is very important that all of your intake pipes are lined up correctly and tightened down....any air leaks will cause error codes and a decrease in performance.
  4. Install the rubber seal on top edge of heat shield. Trim as needed with a razor blade and wire cutter (seal has a metal wire that runs inside of the rubber to help it keep its shape).BMW E36 cold air intake - trim the rubber seal to fit
  5. Reinstall the left front headlight following the reverse instructions in Section 1 of this article.
BMW E36 Cold Air Intake Installation Finished
This article is certified AI Free. All of the following content is original. It is neither AI generated nor AI enhanced. It was researched and written by humans exclusively for the BMW Repair Guide. For more information on the AI Free Zone, please click here.