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Old 05-11-2002, 23:49   #1 (permalink)
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confused Changed plugs and now running rough???

Wondered if you guys might be able to help me with an interesting problem.

Changed the plugs in my sprint (yep with the different ones for the sprint) and found the car not idling as well and doesnt really want to run smoothly at below about 1500 when cruising. Its pulling harder and feels like its going better but seems not to be quite as smooth down low as before.

Any ideas? The plugs were NGK and exactly the same as what came out of it. Almost feels like its got a miss but not quite when its idling. Did/Do sprints run a little rougher than an XR8?

Thanks any help would be good, just wondered if there was something i could try tweakin or wether i should just have it tuned.
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Old 05-12-2002, 00:22   #2 (permalink)
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roll Changed plugs and now running rough???

Not sure about your plugs, sorry.

Were you driving past Big W at around 2:30?

I heard the V8 then when i looked it was a white Sprint, you have probably seen me around, see the car at. http://www.fordforums.com/gallery/in...at=500&thumb=1

good luck with the plugs!
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Old 05-12-2002, 00:36   #3 (permalink)
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haha highly likely to have been me i work at just up the road
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Old 05-12-2002, 03:08   #4 (permalink)
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Did you check the gap of the plugs?. Check owners manual or NGK technical help for the optimum gap for your vehicle. Never assume that the plugs are set to the correct gap.
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Old 05-12-2002, 05:22   #5 (permalink)
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Didn't damage a HT lead while swapping plugs I hope? I think that the most likely cause is a loose or damaged plug lead. Check that the metal fitting hasn't come away from the carbon core and use some of that silicon conductive paste that Ford recommend you apply to the top the plugs before you put the leads plugs.
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Old 05-12-2002, 05:28   #6 (permalink)
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You got the correct plugs? The Sprints have longer plugs as with most after market alloy heads..
The timing right ? gone correct way around dist cap?
Leads on them can be very much be like this too...
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Old 05-12-2002, 05:36   #7 (permalink)
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Could be that you have not screwed one of the plugs all the way home
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Old 05-13-2002, 05:48   #8 (permalink)
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I had a problem with my EFI cleveland using NGK plugs where it felt like a slight miss at light load cruising. A few of my friends told me about a batch of dud NGK plugs and at least four of them had the same problem. I stuck some Champion plugs in which fixed it.

Could be a pissabolity with yours. Also check to see if your lead clips haven't opened up.

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Old 05-15-2002, 20:35   #9 (permalink)
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Thanks for the help guys, ive been away for a couple of days and after playing around with the leads a bit it seems to have gotten a bit better. I will still get the car tuned in the next week or so anyway i think.
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