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Tanndoktorn

Member Since: 18 Jan 2020
Location: Oslo
Posts: 12

Limp mode & Speedometer occationally going nuts

Hi! This is my first post here. I hope you can help.

I've bought myself a 2007 defender Puma 90 and love it so far.
It's my first defender and I'm starting to get to know its quirks. One of the problems I can't sort out is this:

Occasionally the speedometer either stops working while I'm driving or the needle jumps up and down like it's a bad connection or something. At the same time the car seems to go in some kind of limp mode and looses power. Stopping the car, turning the ignition off and back on again, seems to temporarily solve the problem. Today it disappeared after one restart. Earlier I've had to restart up to three times before the problem disappeared again.

I suspect some kind of bad connection or moisture somewhere and It seems to come back if I park the car outside in the rain for longer periods.

Any suggestions what to search for?

18th Jan 2020 11:05pm

wyvern

Member Since: 13 Dec 2009
Location: Cornwall
Posts: 2108

2012 Defender 110 Puma 2.2 XS CSW Firenze Red

Welcome to the forum and hope that you find the info on here useful!

I had a similar problem with my 2.4 110 - check the relays under the Right hand seat for tightness - mine was a loose relay that had been causing issues for a few weeks but caused me to grind to a halt one day .. A recovery mechanic was called and took less than one minute to diagnose and fix!

Hope that helps and is the only problem

Poppy - TDCI (Puma) 110XS 2.2 - Camper conversion - see the build here - https://www.defender2.net/forum/topic56530.html
Elgar -TDCI(Puma) 110XS Dormobile - now sold
Devon & Cornwall 4x4 Response - DC126

19th Jan 2020 8:53am

ickle

Member Since: 22 Jul 2010
Location: South Vendee
Posts: 1782

2008 Defender 110 Puma 2.4 CSW Alpine White

Mine did the same & it was the connection on the transfer box for the speed sensor, removed, cleaned and reseated & all good since.

HTH Keith

19th Jan 2020 12:37pm

Tanndoktorn

Member Since: 18 Jan 2020
Location: Oslo
Posts: 12

Thanks! I had a look at the relays yesterday, took them all out and reseated them after a quick "wash" with an elecronic cleaner spray. Where do I locate the speed sensor? Is it easy to get to?

20th Jan 2020 8:17pm

ickle

Member Since: 22 Jul 2010
Location: South Vendee
Posts: 1782

Underneath, on the back face of the transfer box, slightly above and behind the handbrake drum.

Keith

20th Jan 2020 9:00pm

Tanndoktorn

Member Since: 18 Jan 2020
Location: Oslo
Posts: 12

Is it possible to fairly easy get access to this sensor from inside the the car, through the floor?

1st Feb 2020 4:18pm

ickle

Member Since: 22 Jul 2010
Location: South Vendee
Posts: 1782

On your back from underneath, I can do it and I'm (allegedly) fat!

Keith

1st Feb 2020 5:23pm

Tanndoktorn

Member Since: 18 Jan 2020
Location: Oslo
Posts: 12

I removed the cubby box to get access to it. You must be an octopus to get to the sensor from underneath the car? 😁
I tried to clean the speed transducer and the contact with electronic cleaner spray and my speedometer now died. Guess I found the problem then and will buy a new sensor to see if that fixes the problem 😊

Click image to enlarge

1st Feb 2020 10:07pm

mata

Member Since: 24 Jan 2014
Location: Manchester
Posts: 153

2009 Defender 110 Puma 2.4 USW Stornoway Grey

I had this. The engine reduces power when it thinks the vehicles stationary, presumably to stop someone over revving it. Broken wire near plug to speed sensor easily accessed from underneath. Easy fix but pain in the arse to drive around for the couple of weeks before i was able to investigate.

Click image to enlarge

2nd Feb 2020 8:25am

ickle

Member Since: 22 Jul 2010
Location: South Vendee
Posts: 1782

Mine was a poor or dirty connection a few weeks after first clutch change, pulled off the road, got under car wiggled connection and all was back to normal.
Good luck
Keith

2nd Feb 2020 1:03pm

Tanndoktorn

Member Since: 18 Jan 2020
Location: Oslo
Posts: 12

I just tried to clean it up again, and now it works.
The speedometer works again, but the other reason why I started to search for sensor problems remains:
The engine is not running well between 1500-2000 rpms. It seems like it does not get the fuel it needs for brief moments or some kind of limp mode kicks in erratically (on/off at a fast pace) - Excuse my English, I can't find the right words.

I just cleaned the MAF and MAP sensors and feel that I got more power in general and smoother running, except for the problem between 1500-2000rpms.
The engine seems to run fine at other rpms for the moment.

Any idea what to search for next?
I'll change the speed transducer when I get a new one to make sure it's 100%.

2nd Feb 2020 3:59pm

Tanndoktorn

Member Since: 18 Jan 2020
Location: Oslo
Posts: 12

Update:

A new speed sensor seems to have solved the speedo problem.

BG 245 diesel fuel system cleaner seems to have solved the problem between 1500-2000rpms

6th Mar 2020 8:24pm

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