Discovery 2 V8 2001 - Engine Running Issues

John R · 19th January 2018, 09:27 AM

Dear Forum members

I have a 2001 Discovery 2 4.0 V8 with Thor Engine. The car drives beautifully normally but recently it's displaying various symptoms to indicate something is wrong. These symptoms are:-

Stops after idling for few minutes
misfires under load at and over 3500 rpm

I have purchased a iCarsoft LR V 1.0 OBD reader and the only code error it gave me was that there is an issue with the MAF sensor.

However other threads indicate possibly failing ignition coils and or even problems with the HT leads to the plugs.

Noting that the car has ben serviced regularly, has 200K on the clock and uses almost no oil and has new spark plugs. Can anybody help me with a possible diagnosis (or similar experience) before I start on a process of elimination by changing a whole bunch of parts.

Regards

John R

**biggin** · 19th January 2018, 09:32 AM

Unplug the MAF first and see if it improves.

John R · 19th January 2018, 01:53 PM

Thanks

Will do and let you know on Monday

**trout1105** · 19th January 2018, 02:02 PM

It could be a fuel issue, failing fuel pump or dirty fuel filter (this is in the fuel tank) as what you are describing sounds like the engine is "Starving" for fuel.

**Eevo** · 19th January 2018, 02:51 PM

Originally Posted by trout1105

It could be a fuel issue, failing fuel pump or dirty fuel filter (this is in the fuel tank) as what you are describing sounds like the engine is "Starving" for fuel.

i agree with this assessment

**biggin** · 20th January 2018, 07:22 AM

Your probably right but it doesn't cost any time or money to pull the MAF plug.

**Pedro_The_Swift** · 21st January 2018, 06:52 AM

and a hell of a lot easier!!

will be coil packs I reckon, at 200K past due,

**DeanoH** · 21st January 2018, 08:24 AM

Originally Posted by Pedro_The_Swift

and a hell of a lot easier!!

will be coil packs I reckon, at 200K past due,

X2

Due for coil packs and leads IMO, bugger of a job though, not particularly difficult but lots of bits to remove/refit/re adjust

Worthwhile doing the rocker cover gaskets at the same time. The good news is no lying on your back under the vehicle

Deano

**Roverlord off road spares** · 21st January 2018, 12:29 PM

Originally Posted by DeanoH

X2

Due for coil packs and leads IMO, bugger of a job though, not particularly difficult but lots of bits to remove/refit/re adjust

Worthwhile doing the rocker cover gaskets at the same time. The good news is no lying on your back under the vehicle

Deano

The good news is no lying on your back under the vehicle but you are lying across the top of the motor.LOL

Deano, and the bad news is the coil packs are jammed so close to the rear of the firewall there is little room to get your fingers in there, they are a mongrel of a job. even worse if you have lpg fitted as extra stuff to reove to get the intake off.

**ballbag** · 21st January 2018, 09:29 PM

Sounds like spark rather than fuel to me. Why would fuel pressure drop after ‘idling for a few minutes’?

Is it time related or heat related?

Does it run for a few minutes, restart ok, run again for a few minutes, stop again?

Or does it run, stop, then nothing for some other length of time?

Check battery connections and all main earths.

Coil packs would likely surface as a misfire first above idle, then deteriorate into a weak idle.

Similar for leads, though unlikely several would fail together.

Unplug the MAF.

If no result, change coils and leads. If you intend on doing another 200,000, I’d relocate the coils. They are an absolute ball-ache.

Crank angle sensor is another candidate, though usually they just die outright. Splutter, splutter, stall, no start. Not too difficult to change though.

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