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I have a 2000 4.6 P38 have had the heads changed, spark plugs, wires and "coil packs" (if that is the right term). All that was done within the last 10k to 15k Spark Plugs prob last 5k. I haven't had any problem with the motor but took it in to have the rear air springs replaced yesterday. When I picked the car up today the check engine light came on. He put the computer on it and said it had a misfire on cylinder 4. Asked him what it could be and he said worst case it could be leaking coolant into the cylinder and needs a new motor. He said that cylinder is common for that problem. He asked me if I ever over heated it and I said no. I bought it with 70k miles and it has 101k now. Worst thing that happened was I busted a radiator hose at about 75k miles but I was less than a block from my house and I never saw the temp gauge get into the red. He reset the light and I drove it for another 20 or so miles and it came back on again. I will take it back tomorrow to have him pull the plug but is that something I should worry myself about? Would they have notices that when they changed the heads?

Thanks
 

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If it is a leaking gasket I've heard of miracles working with the latest technology additives at any parts store intended to stop head gasket leaks. I think Bar's Leak was the stuff that someone on here used.

Keep us posted on what happens!
 

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If it did blow a hose the temp gauge cannot be relied upon (as the temp reader is in the top of the engine - which would have no coolent in if you had bown the hose)
always stop if you've blown a hose to save the engine. :!:
seen as it was some 30k miles ago i doubt if that's the problem.

a missfire could be something as simple as the injector connector for that cyl being dirty or not fully seated.

(found after replacing all plugs, compresion check etc. etc. etc.)

spark plug leads not correctly seated

coil duff

etc.

I would start with them, see if you can get the exact code/s off the garage
 

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1995-2002 Range Rover P38A
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If HT leads are not routed and insulated from metal or each other you will get a misfire.
These coils are demons due to the wasted spark effect....
 
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