Second that! I fought Disco Mike's advice on that one tooth and nail. Kept cleaning mine and cleaning. Worked good for a day then s***y idle under 2k rpm. The Bosch MAFs in the Disco degrade over time - period! -- and the K&N filter and cleaning accelerates that. A failing MAF will not throw a code. I boned three MAfs on three different Rovers until I woke up. DON'T use K&N filters and DON'T clean the MAF. If you suspect yours is faulty spend the bucks for a new one and you'll probably see your truck drive like new. I bought the MAF part only at Bimmerzone for $179 (ours is the same as found on a BMW 540). Others have said they found them cheaper. Get the BOSCH MAF only, the aftermarket MAFs are crap.

Regarding your ticking - could be the exhaust manifold (that's where mine was coming from). A failing PAS pump makes a whine that gets very loud when you turn lock to lock (I just replaced mine). The PAs pump does not tick.

 

The mechanic thinks its my Alternator. He said its causing the tick and has a nasty growl. Again, what have I gotten myself into? These things are something else!

99 Disco 59800
Drive shaft rebuild, K&N filter, removed K&N filter, cup holders (I mean come on) Throttle body heater gasket upgrade, Surp belt (took auto parts store 3 times to get that right) 200 miles and owned it 2 weeks.

 

[QUOTE=neroverguy;165406]The mechanic thinks its my Alternator. He said its causing the tick and has a nasty growl. Again, what have I gotten myself into? These things are something else!

Howl on the alternator sounds plausible. I have it on mine and am changing it out this weekend. If you place a long screwdriver against the alternator and the other side against your ear, you should be able to hear the bearings howling if your mechanic is right. I changed my idler pulleys, tensioners, PAS pump and water pump before I narrowed the noise down to the alternator.

 

When my first alternator went bad it knocked, sounded like a rod knock.
I removed the serp belt, started the truck and she was quite.
Started spinning pulleys and when I got to the alt, knock, knock...went to AutoZone and bought a rebuilt for under $200.
30 min later I was back on the road.

 

I have an intermitent ticking, but it is coming from the back of the engine, around where the coils are. Very loud, but them goes away. When I find the answer I will post it.

PS: Just replaced the mounts on my SAI pump. Best $60 I've ever spent, what a difference! It doesn't sound like a jet engine starting up anymore, in fact, can barely hear it. You can get them online for about $12/ea.