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Land Rover Repair/2001 Land Rover Discovery II Service Engine Light

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QUESTION: You have been immensely helpful in past with issues, so I am hoping you can assist with a very frustrating problem my mechanic and I are having with my 2001 Disco II.

My Service Engine Light has been intermittently going on and off.  The codes read, that it has misfires on cylinder #'s 3, 5, and 7.  We changed the plugs and wires, (we noticed #7 wire was arc'ing) and for 2 mos that seemed to have solved the problem.  Then the Service light flashed back on, showing again that cylinder #'s 3, 5, and 7 were misfiring.  Both coils were then changed.  Within 5 miles of driving the vehicle the Service light flashed on again.  

I am fairly certain it is the same issue. The vehicle will be running fine then hesitate slightly, run a bit rough, light comes on, then it is fine....this is what it did prior to changing the plugs and wires.  I trust the shop. They work on Land Rovers and Mercedes...it is a European Car Maint Shop.  My father, a retired mechanic seems to think it is a vacuum leak that is causing the vehicle to lean out.  Finally, when this happened used to be only on hills, now it is on level pavement as well.  The vehicle is well cared for, has a lot of miles 181,000, but as I said, almost everything has been replaced, as you can imagine, haha.

Thank you for any help you may be able to give us.

ANSWER: I am sorry to say this sounds like an engine going bad. The blocks develop cracks, and coolant gets into the cylinders. This accounts for the rough running and misfires.  The problem often starts under heavy load (hills) and progresses to flat ground. Does the truck use coolant? That would pretty much cinch it.  DO a Google search on Land Rover liner failure and I've got some articles that explain with photos.

Sorry to have likely bad news

John

---------- FOLLOW-UP ----------

QUESTION: Hi John,

Thank you for your quick response.  I hope you are incorrect, but not holding my breath....The garage also performed a compression test on all 8 cylinders and a cylinder leak test and all read strong with no red flags.  The vehicle does not use coolant either.  The hesitation and rough running maybe lasts for 15-20 seconds and then all is back to normal...

Anyway, if you are correct and these tests were not, and I keep driving the vehicle, what may happen?  Will it overheat and that is it?  Will it just stop running?  In other words, when it fails, how will it?

Thank you again sir.

Answer
If the engine is going bad the coolant loss will worsen, and you will get misfire codes on the middle cylinders (3,5,4,6) as opposed to the ends (1,2,7,8)   You may see more steam in the morning and it will start overheating.  Eventually it will fail through overheat  

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John Elder Robison

Expertise

I own J E Robison Service in Springfield, MA. We are Bosch Car Service for Land Rover, BMW, Mercedes, and other European lines. I can answer most questions about Land Rover service or repair. I'm known as a car enthusiast, machine aficianado, photographer, writer, and speaker. I've been around Land Rovers and British cars most of my life. Visit me at my car business, www.robisonservice.com or my author website, www.johnrobison.com. Check out my autism and writing blog at jerobison.blogspot.com or my photos on www.pbase.com/robisonphoto John Elder Robison

Experience

I have been a Land Rover service manager since Land Rover returned to North America in 1987. My company is a four-star Bosch Car Service facility, known nationwide for Land Rover service, overhaul, customization, and restoration. In addition to Land Rover our company services BMW, Jaguar, Mercedes-Benz, Rolls_Royce, and Bentley motorcars. We have factory-plus-level service capability for all makes. Visit my company online at www.robisonservice.com > service > land rover Also visit my blog at robisonservice.blogspot.com

Organizations
ASA IATN NPPA PPA

Publications
In the Land Rover world, my writing can be found in various print magazines and online at robisonservice.blogspot,com. In the wider publishing world, my work is published by 20 publishers in over 50 countries. Mt books Look Me in the Eye, Be Different and Raising Cubby have made US and international bestseller lists.

Education/Credentials
I am ASE certified, Bosch Trained, and trained by Omnitec/T4 and Autologic on their Land Rover test systems.

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