John Laughlin 
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| 11/19/2008 4:36 PM |
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I have a 2000 Discovery II with 118k miles that I have replaced the MAF sensor (aftermarket), Bosch Platinum +2 plugs, 8mm wires (aftermarket), O2 sensors (supposedly quality used) and ignition coils (aftermarket). After replacing all parts, the Disco started up just fine, but did not make it over 15 mph before the engine felt like it was horribly misfiring!
I questioned the differently stamped firing order on the aftermarket ignition coils and decided to reinstall the original coils back thinking that was the problem. The ‘misfiring’ feel is still there while driving. The reason I wanted to replace all of the above is that I was told the MAF went out and had fouled out all the plugs, I know the plugs were fouled out, but am I headed down the wrong path, or have I just overlooked something?
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Mike Rupp
Bellevue, WA
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| 11/19/2008 4:44 PM |
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| Buy some cheapo Champion or NGK plugs and toss the Bosch Platinums. The Platinums have very thin electrodes that get fouled quickly on these dirty motors. I'd start there and see what happens. |
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WZ7V
My Coffee Blog
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Dan Cronin
Bothell, WA
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| 11/19/2008 5:06 PM |
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What Scott is about to say 
Dan |
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Scott Williams
Behind Todd's water heater
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| 11/19/2008 6:42 PM |
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NO NO NO!!!!!! Use platinums with D2. The cheapo plugs are for the old engine management systems. The new Bosch style engine management needs platinum plugs to run correctly. The +2's are not necessary however. If you went off the firing order on the coils you may have crossed a wire or two. I can send you the correct routing so you can double check yourself. PM me if you want that info.
Scott |
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Roverholic currently seeking treatment through Mini Cooper S |
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Larry Grubbs
Lake Oswego, OR
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| 11/19/2008 7:56 PM |
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| I respectfully disagree with the platinum's required statement. If I recall Platinum plugs main purpose is to increase the interval between plug changes, nothing else. Also, if one were to do a search over on Dweb for "misses" after a tune-up, about 90% of the time somebody put platinums in their Rover. Go NGK or Champion Truck plugs as I did and report back then. |
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Scott Williams
Behind Todd's water heater
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| 11/19/2008 8:02 PM |
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NO NO NO NO NO NO NO. Please Please use platinum plugs! The heat range is different. The coil output is different to match the plugs. If you had a D1 or a classic it would be a different. DWEB is DWEB. I work on these for a living and I am not trying to mislead you. I promise. The +2's may be causing problems, but don't ditch them for copper core plugs. GO to a standard Bosch, NGK or Denso platinum. The firing order is not marked on the coils. If you look closely you'll notice the coils are marked 1 2 3 4, on both coils. Not 1 2 3 4 5 6 7 8. It is very easy to cross a wire on the D2. With one set of wires crossed it will run, even decently on high idle, but run rough when the idle drops. PM me and I may be able to walk you through some things.
Scott |
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Roverholic currently seeking treatment through Mini Cooper S |
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Scott Williams
Behind Todd's water heater
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| 11/19/2008 8:06 PM |
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Platinum plugs have a hotter spark and different heat range. As do Iridium plugs, etc. The plugs are designed to work with different coil outputs and heat ranges for proper combustion. It is important to keep the right plug in the engine. As Mike mentioned, in a D1 a platinum plug runs like garbage. If platinums only purpose was to extend the life of the plug the engine would run the same, and it doesn't. If it started it's life with platinum keep it, if it was copper, keep it.
Scott |
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Roverholic currently seeking treatment through Mini Cooper S |
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Mike Rupp
Bellevue, WA
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| 11/20/2008 6:36 AM |
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| Sorry, my bad! Just buy whatever plugs LR & Scott say to buy. |
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WZ7V
My Coffee Blog
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John Laughlin
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| 11/20/2008 7:02 AM |
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Ok, I think there is a bigger issue here, I have traded out the Bosch +2s with NGK regular and cheap, larger elecrode Autolite Platinum plugs, EVERYTHING is fouling out within seconds!! Do I have the firing order crossed? I triple checked, but I have been known to make mistakes! Or does this sound like a different issue? Thanks for all your help! |
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Ryan Hall
Portland, Or
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| 11/20/2008 7:16 AM |
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Talk to Scott. He knows what hes talking about. He said he can walk you through somethings. Take full advantage of his knowledge and experience. That stuff is expensive when you have to pay for it. |
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John Laughlin
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| 11/20/2008 7:27 AM |
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Oh yeah, I have a better explaination for misfiring horribly, "a 'bucking' rough ride" misfire! Still at less than 15 mph! |
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Roger Carr
Bothell WA
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| 11/20/2008 1:35 PM |
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| Gapped right? |
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Roger Carr
www.pstoc.org
05 Tacoma Dbl Cab |
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jack lester
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| 11/20/2008 7:56 PM |
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| John, if you have access to one, you can use a strobe timing light on each ht lead to make certain all of your plugs are firing. just a thought.. |
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