Crankshaft Position Sensor Fitting

[wayneg]

I have today had no start issues, looks like its the CPS as nothing else shows on diagnostics. A quick look at the CPS looks like the unit is fairly easy to get at however the plug looks to be hidden up behind the exhaust manifold.
Question is has anyone done one on a Thor car who can comment on getting at the plug. I think taking the N/S wheel off along with the inner wheel arch will give better access.

[Keithy P38]

The plug is behind the passenger side head (nearer to the firewall) and is easier to get from above.

The sensor (including plug) is a 5min job. No need to take tyres or guards off, just creep under and go to town on that sucker!

From memory there's two sizes, the outer casing is small like an 8mm head, the sensor itself is a 10mm (or the other way around).

If the engine is hot, allow curse time for when you burn your hands.

Cheers
Keithy

[wayneg]

Cheers for that, There are a few how to`s on Disco but apart from a vid where they take the exhaust off on a P38 for access not a lot on the PLUG. Can you remove the sender and pull the whole lot up to get at the plug or is it a knuckle fight with the head and firewall?

I read its 7mm outer and 8mm inner

[Keithy P38]

That might be the case (7mm and 8mm), its been a while!

The plug is easy to get at and easy to unclip. Life is better if the car is in access height, but if it isn't just stand on a chair or milk crate. Very easy job.

[wayneg]

I got my hand down there this morning for preliminary investigation. Think I have found the plug and should be able to release it. Dont want to mess with it till the new one arrives most probably in a couple of weeks the way the post is lately.

[Keithy P38]

It is quite easy to trace from below, the wire has a silver sheath over it (mine had a bit of old engine oil on it from a previous leak somewhere which I degreased before the job).

[Keithy P38]

http://www.aulro.com/afvb/p38a-range-rover/173436-rangie-just-stopped-engine-no-go.html

And it was you who have me the clue to pour water over the hot sensor after it failed!

[wayneg]

The cold water trick is general for all cars, hence the suggestion. I have a Merc with the later M113 V8 engine and they are notorious for cps failure. I now keep a spare in the boot. Never done one on a Rangie. 1st thing I did when I got home and the RR would not start was turn the garden hose on the cps, car started straight away so 90% sure its the cps. Hooked up a Rovercom on the car but no errors or anomalies. The only thing comparing it with the other car ( with a good CPS) was that the tooth count on live data with the engine running did not seem to be acting in the same way. Anyway car is parked up now waiting the new CPS. I have bought 2 so will do both cars.

The search function on here is not the best, I never came across that thread you put the link to

[Keithy P38]

That's a pretty safe diagnosis! Bet you can't wait to have it going again!

Cheers
Keithy

[wayneg]

A quick add on this job. As already advised by Keith the plug can be undone quite easily from the top. The male part from the loom just lifts away. The Female plug attached to the CPS wire is held captive in a U shaped bracket. The plug needs to be moved toward the bulkhead to clear the bracket before the cps can be removed from below. The bracket seems to be a snap fit so not overly easy to get the plug out. I found a long screwdriver could easily get between the head and plug to Pop it out.
As Keith said not the hardest job especially if the engine is cold, Definitely get to the plug from the top

[wayneg]

No more no starts and conk outs ( so far) with the Known good CPS. Happy days..
Anyone with a failure, what was the milage/KLMS Mine got to 248000Ks so pretty good going i think.

[Keithy P38]

Mine had 235,000kms on it when mine failed.

[TheTree]

HI

I should have another 80K or so to go then :p

I think I am going to get a spare though, since this is one of the "show stopper" failure items, having a spare is cheap insurance

Steve

[flathead steve]

I'm at 225 k's I better write all this down .