Okay, 2004 disco 141000 miles.
Within the past month, I have spent $2000 on different repairs including resolving this issue.
Truck was riding excellent... no indicator lights all was well.
Upon start up, flashing service engine light.
Took it back to shop (a rover specilist)...
He did a compression test? He said all cylinders register at 150 except the 3rd cylinder which registered 25.
He said point blank "you need a new engine"... digging into it to see whether is a blown gasket, etc will take alot ofmoney and I still may need an engine.
Aside from on the highway it rides rough and service light flashes. On the highway it rides like normal. Needing a new engine sounds like the death of my truck. Seeing how the value is like $7,G. I said "can I lightly drive it while trying to figure out my options", he said, "you won't hurt it worst than it already is".
Any input is appreciated.
I'm in the Nashville TN area if anyone from this region catches this that does rover work.
Thanks.

 

I have the exact same problem on my daughter's 04' right now. 80,000 miles with HG job done less than 10k ago.

Drove it to Costco to get gas, sounded fine. On the way back started hearing a almost puffing noise, wanted to sound like a choo choo train but not, then bam got the check engine light and starting running rough.

Got home and it showed misfire on 3, looked at the real time data and it was misfiring like every revolution(basically dead).

Then I checked the oil and it was over 2 quarts low, not registering on the dipstick! had just changed the oil 500 miles ago. Got underneath and there was no signs of major leakage.

My first thought was I ran it low on oil and lost a lobe on the cam.

Took it to my Land Rover mechanic friend and as I was in the street waiting to pull in and he had it diagnosed already.

Blown head gasket, most likely a stripped bolt hole on the inside of cylinder #3. He said the low oil was from the cylinder pushing the oil out. He removed the oil cap and set it on the stand pipe and the cap was bouncing around almost levitating from the the compression in the crank case.

He uses a tool called a "Time Sert" to drill out and replace a sleeve in the thread hole. We are doing the job tomorrow. I will update for the confirmation.

 

Thanks. .. keep me posted.
What region are you in?

 

Southern California.

I'm 99.5% sure it's the head gasket. My friend is a savant, been working on rovers at Indy shops for 11 years.

 

Mine was the head gasket. Blown all the way through on the inside of cylinder #3. Oil was being sucked in on the downstroke creating the misfire. Number 4 also had a hot spot. Both inside bolt holes were stripped and needed inserts.

Looks like the shop that did the previous HG job didn't torque properly or blew out the threads but didn't bother to fix them.

 

there is a Cadillac repair kit for north-star engines that comes with thread inserts about three time longer than most.

 

"Looks like the shop that did the previous HG job didn't torque properly or blew out the threads but didn't bother to fix them."
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Indeed; beware. There are head gasket jobs, and there are head gasket jobs. Know what someone is doing, or about to do, on your engine heads/head gaskets. Aluminum heads, and aluminum blocks are sensitive to excess heat and to insensitive people working on them, and can be, and often are, damaged by either one, or both.