Carrera speed/reference sensor replacement - partial drop required?

juicersr · juicersr's Garage

Getting ready to replace the two Speed/ Reference sensors (ones at front near tranny bellhousing) on the Carrera and was wondering if a partial drop is needed, or if there a technique for doing it without? Also going to replace cylinder head temp sensor as well.

Thanks.

burgermeister · burgermeister's Garage

Relatively easy to do. Work ref sensors out slowly. Use a wood stick or dowel to work grommet back in.

CHT, just clip wire and use a socket.

Requires removing LR Wheel and jacking up car, that's about it.

GH85Carrera · GH85Carrera's Garage

It is a good idea to replace sensors & cylinder head temps sensor all at once. I went ahead and did my O2 sensor as well. All of them had been in there for years.

You do NOT have to do a partial drop. You have to have strong fingers and patience. It ain't fun but it should not take more than an hour.

Put some grease on the rubber grommet to get it back into place.

juicersr · juicersr's Garage

Thanks fellas!!!!

Jim Garfield · 10-30-2009, 01:28 PM

As others have posted you don't need to drop the engine, but you do need to modify a deep socket (I'll have to check which one) by cutting a slot for the wire. IIRC I also had to bend the engine tin a bit to get something in or out. It was a while ago that I did mine.

There are some pretty good threads regarding changing the sensors that will save you some grief if you do a search first.

Jim Garfield · 10-30-2009, 04:35 PM

It's a deep 14mm socket that I made a slot with a grinder for the wire.

McLovin · 10-30-2009, 04:53 PM

As said above, no engine drop necessary.

I agree, it's a good time to also do the CHT sensor, ESPECIALLY if your car still has the old 1 wire style CHT sensor.

You don't need the slot grinded socket for the speed and reference sensors, you do need it for the CHT. (Some people do it without, but cutting the wire on the old one, using a regular socket to get it out, then using needle nose pliers to put the new one in. I wouldn't be comfortable with that, I don't think you could tighten it enough with needle nose).

Also, the CHT sensor can be either 14mm or 13mm. I just did my car, and the old one was 14mm (single wire), but the replacement, 2 wire version was 13mm.

kidrock · 10-30-2009, 06:38 PM

don't forget to add a smidgen of anti-seize compound on the threads of the new CHT sensor during install.

juicersr · juicersr's Garage

Quote:

Originally Posted by Jim Garfield

It's a deep 14mm socket that I made a slot with a grinder for the wire.

Thanks. It's this kind of info that makes all the difference in the world when doing these projects.

tomphot · 10-31-2009, 06:16 AM

I seem to remember some people having problems getting their CHT out and it was recommended to not clip the wire right off just in case you run into trouble.

kidrock · 10-31-2009, 06:34 AM

Quote:

Originally Posted by tomphot

I seem to remember some people having problems getting their CHT out and it was recommended to not clip the wire right off just in case you run into trouble.

It's actually probably easier to clip the wire. It's true that the CHT sometimes may be "seized" in the hole, and may need liberal use of PB blaster or whatever. But with the wires clipped, it's easier to get a good grip on the sensor itself. IIRC, you need a 14mm deep socket to remove it.

burgermeister · burgermeister's Garage

Might be a 13mm deep socket for removal? I vaguely remember needing a different size than for installation ...