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Old 04-01-2007, 09:02 PM   #1
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i am doing a tune up on my 1998 SLE what are some good performance pluge and wires that i should consider on useing? is bosh platnum 2 or platnum 4 a good performance plug?
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Old 04-01-2007, 09:08 PM   #2
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man dont use anything that is bosh they are not good
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Old 04-01-2007, 09:10 PM   #3
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wy is bosh bad? it has bosh platnum 2 in it know they are not in bad condition but i do not know how long they have ben in for. whar do you recomend on useing?
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Old 04-01-2007, 09:16 PM   #4
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ditch the Bosch plugs -they are known here on Bonneville Club to be VERY problematic in the 3800 engines. A more desirable plug is a NGK V-Power TR55 gapped at .058"
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Old 04-01-2007, 09:19 PM   #5
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what problems do bos plugs cause?
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Old 04-01-2007, 09:32 PM   #6
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ON TO THE EVILS OF BOSCH!

Bosch acknowledges a problem with using their Bosch Platinum spark plugs
in engines with ignition systems that employ 1 coil for each pair of spark
plugs (also known as a "waste spark ignition system"). Our GM 3800 engines use such a system.

The problem that Bosch has acknowledged when using their Platinum plugs
in engines with waste spark ignition systems stems from the tendency of
electrode metal to get transferred depending upon the polarity (direction
of current flow) of the spark. In waste spark ignition systems, 1/2 of the
plugs always see reverse polarity sparks. Given the very narrow platinum
center electrode of the Bosch Platinums, performance will be degraded more
significantly when reverse polarity sparks will cause material to be
transferred from the large ground/outer electrode onto the narrow platinum
center electrode'* exposed end surface.

Many of our members have had the same problem when Bosch plugs were chosen without prior knowledge of these issues. Our experience backs up the findings above.

If you want to research this further for yourself, try a simple google or Yahoo search on the terms BOSCH WASTE SPARK.
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Old 04-01-2007, 09:35 PM   #7
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ok so i have bosh know what should i replace them with ?
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Old 04-01-2007, 09:37 PM   #8
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ngk tr55
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Old 04-01-2007, 09:43 PM   #9
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how is the NGK tr55 better from AC delco plugs?
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Old 04-01-2007, 09:45 PM   #10
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you got me there dude i dont know but in my experience ngk tr55 will be ok
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