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Formerly known as Syzygy
Join Date: Mar 2008
Location: Calgary, AB
Posts: 4,420
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Spark plug question
Do these seem appropriate for my engine? It's a 3.2 Euro model with the higher 10.3 (or .5) compression. Right now, I've got NGK BPR7ES plugs with no obvious issues, but are they the most correct?
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Kevin 1987 ROW coupe, Marine blue, with a couple extra goodies. The cars we love the best are the ones with human traits, warts and all. |
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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if the mixture and timing are set, put in new plugs, start with a cold(er) and drive it for a while then check them. if you are fouling plugs, starting or idlng, go one stpe hotter. if they are black go one step hotter until you get clean almost white plugs. thye dont need to be pure white, just clean, but you need to start with cold plugs.
hot or hotter plugs are only needed for city driving and the idle circuit, although electronic FI is much cleaner these days, otherwise engines could use colder plugs. i ran bosch 4's, very cold, in my 2.7 just as a test. they were pure black with soot from city driving but cleaned up very nice when i went on a trip, due to the constant hiway driving.
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