'Check Engine' light, revs cutting out

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gR@HaM

Well-Known Member
Posts
1,095
Location
Cheshire
Hello, originally posted in Disco section but I've had no joy.
Help!!!!





* #1 * *
28th-October-2010, 18:13

gR@HaM
Senior Member
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Join Date: Feb 2009
Location: Cheshire
Posts: 801

Check engine light
Have been searching google along with LZ (although not ideal as all 3 words are very common) but the only advice I can find is get the codes read.
This afternoon my 'check engine light' flashed up, initially with some engine hesitation whilst driving down the slip road, last few times with no effect on the disco at all.
Last night I drained the cooling system (as have been temporarily running with water) and replaced with coolant. Checked the level this evening and it had dropped a bit probably due to an airlock somewhere, so topped it up and went for another drive - wasn't sure if there's a pressue sensor anywhere. Anyway, the light still flashed up
Any advice on things to check appreciated..
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gR@HaM

'95 Discovery 300Tdi ES 2.5

AlfaRomeo 147 GTA 3.2V6


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* #2 * *
29th-October-2010, 11:56

gR@HaM
Senior Member
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Join Date: Feb 2009
Location: Cheshire
Posts: 801

Re: Check engine light
No light this morning, hopefully it was due to coolant pressure
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gR@HaM

'95 Discovery 300Tdi ES 2.5

AlfaRomeo 147 GTA 3.2V6

* #3 * *
29th-October-2010, 15:08

Big Stu 12
Senior Member
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Join Date: Aug 2010
Location: Suffolk & Essex
Posts: 806
Re: Check engine light
I had that the other day but mine was caused by pulling out fuse number 14 in the satelite fuse box, it stayed on for a couple of starts then went out and is still out, so i wondered if it was one of those things that needed clearing by starting a couple of times.
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* #4 * *
12th-March-2011, 16:19

gR@HaM
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Join Date: Feb 2009
Location: Cheshire
Posts: 801

Re: Check engine light
Hi all, I been away from LZ for sometime but this issue with engine cutting out is now getting unbearable. A few return trips to Essex (approx. 500miles) and a day out today has given me some more info on the problem..

For starters it has got a lot worse. Btw I have a 95 ES auto.
- The issue is short bursts of hesitation of the engine caused by revs momentarily cutting out with 'check engine' light coming on.
- This occurs when going over bumps in road although today the slightest ones caused engine to cut out, at one point on m56 every couple of seconds!
- This happens with or without foot on accelerator although is obviously more noticeable with foot on as causes disco to jerk.
- This can be at any speed, so with or without torque convertor locked up.
- Tends to happen on longer distance drives after a high speed run on dual carriageway/motorway after engine has heated up.
- The only way ive found to help the problem is pulling over and waiting for engine to cool down.

It seems to me that there is a faulty sensor that is causing issues with movement, although the fact that it normally happens once engine is hot indicates water or oil related? Unless something else is expanding causing the problem.

One question I've had since doing the rebuild is exactly what the sensor is directly on top of engine, nearside of rocker? The plastic connector on this had corroded so I'd 'temporarily' taped the green and black wires to the spade ends on the sensor. Wondering whether a faulty connection here was causing the issue I completely disconnected today (when broken down on motorway!) and am yet to see the problem, probably because engine had cooled down by then!

SO, any help/advice/pointers/ideas et. al. muchos appreciated as I got a lot of driving to do next week!!

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gR@HaM

'95 Discovery 300Tdi ES 2.5

AlfaRomeo 147 GTA 3.2V6
Last edited by gR@HaM; 12th-March-2011 at 16:22.

* #5 * *
12th-March-2011, 20:50
RichardH
Junior Member
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Join Date: Dec 2007
Location: Lanchester, County Durham
Posts: 16
Re: Check engine light
My engine check light came on (98 XS auto) a couple of weeks ago and after a bit of investigation I've diconnected the sensor on the rocker cover. This has kept the light off but the engine is a little harder to start on very cold mornings.

The engine starts fine from cold with the sensor connected but starting when warm sees the engine check light come on and forces limp home mode with hardly enough power to get up slight inclines.

I'm replacing the sensor tomorrow so I'll post back if it solves the problem as it might be a quick and easy fix for both of us.
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* #6 * *
12th-March-2011, 21:11

gR@HaM
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Join Date: Feb 2009
Location: Cheshire
Posts: 801

Re: Check engine light
Nice one hopefully the light is related to this sensor in both cases..
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gR@HaM

'95 Discovery 300Tdi ES 2.5

AlfaRomeo 147 GTA 3.2V6

* #7 * *
Yesterday, 09:21

gR@HaM
Senior Member
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Join Date: Feb 2009
Location: Cheshire
Posts: 801

Re: Check engine light
I'm thinking of soldering the wires to a new sensor to eliminate any bad connection.
Can anyone confirm whether it matters which way round the black/green wires are?
If it's a pressure or temperature switch then I would guess it doesn't matter but not sure whether this sensor is on all 300tdi's or is part of the EDC electrickery..
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gR@HaM

'95 Discovery 300Tdi ES 2.5

AlfaRomeo 147 GTA 3.2V6

* #8 * *
Today, 18:01

gR@HaM
Senior Member
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Join Date: Feb 2009
Location: Cheshire
Posts: 801

Re: Check engine light
It's reared it's ugly head again.. anyone??
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gR@HaM

'95 Discovery 300Tdi ES 2.5

AlfaRomeo 147 GTA 3.2V6


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