# Intake manifold gaskets, replace. S14

Disconnect negative cable from battery. |
Loosen clamp on intake hose at airflow meter (yellow arrow). Disconnect altitude sensor and air flow meter (blue arrows). Loosen two 10mm nuts retaining air filter housing (green arrows) and remove the assembly. |
Loosen clamp on intake boot, remove wiring from clips on boot and remove from air box. |
Disconnect accelerator cable and cruise cable if fitted, by squeezing plastic tabs together and pulling retainer from bracket (blue arrow). Remove nuts (green arrows) holding cable bracket to intake air box. Place cables, still in bracket, aside. |
Remove vacuum hose to brake booster from intake manifold (blue arrow), remove nut clamping hose to intake manifold (green arrow). Fold hose back out of way. Aluminum fitting will often pull out of intake manifold. Clean fitting and hole, apply Loctite to fitting and re-install. |
Remove hose from fitting on bottom of air box (yellow arrow). Unscrew nut on brace below air box (green arrow). |
Remove hose from front of intake manifold beside number 1 throttle body. Remove nuts attaching air box to throttle bodies, remove air box. |  |
Pull off vacuum line from junction between numbers 1 and 2 throttle bodies. Remove upper hose from idle valve. Disconnect other idle valve hose from fitting between numbers 3 and 4 throttle bodies. Remove idle valve from rubber holder. |
Lever up injector harness, disconnect idle valve extension harness (green arrow) and pull injector harness out from between fuel pressure regulator and cylinder head. |
Disconnect throttle position sensor. |
Remove purge hose from rear left of valve cover. (for clearance only) |
Remove two 10mm bolts securing fuel rail to manifold (one pictured, green arrow) and pull injectors out of manifold. Remove vacuum line (yellow arrow) from fuel pressure regulator. Vacuum hose will more than likely need to be cut off. Replace hose on re-assembly. |
Remove the two 10mm nuts retaining coolant bypass pipe to the left side of the head. Remove the pipe from the hose at the front of the head and move the pipe aside. Plug hose with a bolt to avoid coolant loss. Intake can be removed without this step if hose clamps on elbow hose at front of head are not interfering with the manifold. |
Remove nut retaining engine harness to number 4 throttle body, place harness to the side. |
Remove all the E8 (external Torx) nuts securing the intake manifold to the cylinder head. Slide intake manifold off studs. |
Remove the E8 nuts securing the gaskets to the throttle bodies and remove gaskets. |

### Installation:

Clean mating surfaces completely. |
Although not called for by BMW, it has been found that installation of the paper intake manifold gaskets from an E28 M5 will prolong the life of the rubber M3 gaskets. Install the paper gaskets against the head, followed by the intake manifold with rubber gaskets mounted.
Replace O-rings on fuel injectors. |
Ensure correct positioning of idle control valve harness bracket (green arrow) when installing fuel injector rail. Replace vacuum hose for fuel pressure regulator. (yellow arrow) |

### Part Numbers:

E28 M5 paper intake gaskets (2 required) | : | 13 54 1 315 081
M3 rubber intake gaskets (2 required) | : | 13 54 1 318 318
Air horn O-ring (4 required) | : | 13 54 1 307 768
E Torx bolt M6x16 | : | 13 54 1 308 909
E Torx bolt M6x20 | : | 13 54 1 736 326
E Torx nut | : | 13 54 1 308 911
Coolant elbow at front of head. | : | 13 31 1 308 897

E30 M3 Repair Manual V2.7. Copyright ©1999-2001 Koala Motorsport & Brett Anderson