A short How-To Guide on replacing a faulty throttle cable.
Most faults involving the throttle cable will relate to the cable sticking within the cable outer sheath, generally causing the car to rev uncontrollably. In certain circumstances the cable may be snapped causing no reaction when the throttle pedal is depressed, although this is extremely rare.
This guide shows the cable being replaced on an M52 engine, although the process is pretty much identical on all engines mentioned in the thread title.
Anyway, here is the part that we are going to replace, Part number 35411164636, which fits all E36's except for the M3, at a cost of £23.40 from the dealers. The part required to carry out this task on E34's is slightly different however the process is no different.
Here is where the cable is attached to the throttle body.
This is where is passes through the firewall, just next to the brake booster servo.
In order to see where the other end of the cable is attached to the throttle pedal, this lower trim needs to be removed, simply removed a few phillips headed screws and gently pull it out, remembering to unplug the lamp that is at the bottom.
Here you can see where the cable hooks into the top of the pedal.
Here the throttle end of the cable has been disconnected. In order to do so, simply pull the cable out through the rubber grommet, then using the slot in the side of the linkage, rotate the cable free before popping out the ferule using a flatbladed screwdriver.
A close up of the end.
Here is a picture of where the ferule clips in, sorry it's a bit dark.
Here is a picture of the grommet for the firewall, as you can see in order to remove it from the hole, you will need to use a flatbladed screw driver to prise in each side, this will free it and then it will pull out.
Then simply unhook the other end of the cable and withdraw it through the firewall, note that there is a small rubber o-ring on the hook that will need to be retained and refitted to the new cable.
Note the o-ring as mentioned above.
Feed the new cable through the hole in the firewall noting that the correct orientation points the cable in an upwards direction. The firewall grommet will simply click into place.
Then route the cable through where it needs to go, it will also need to be clipped onto the plastic casing at the back of the engine bay.
Then fit the rubber grommet, before pushing the cable into it. Then feed the cable end around the throttle cam and clip the ferule end back into position.
Then at the other end simply hook the cable to the throttle pedal, ensuring the the o-ring is not deformed.
Then replace the lower trim, Job done!
This isn't a particularly challenging task, although I felt it worthwhile to write a quick guide in order to help those people, that find some of the simple tasks a little daunting, saving them a couple of quid by hopefully giving them the confidence to have a go themselves.
Hope it helped!
Thanks for looking