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The Water Cooler
General Discussion
"Reduced Engine Power"
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<blockquote data-quote="SoonerP226" data-source="post: 2197861" data-attributes="member: 26737"><p>Just an educated guess, but I suspect that they were replacing the COPs (Coil On Plug). On 2nd Gen LSes ('03-'06), when certain COPs fail (usually on cylinder 4, due to its proximity to the PCM), they can produce RF interference that the PCM sees as a failing ETC (Electronic Throttle Control). When that happens, the PCM goes into fail-safe, or "limp home" mode. A tech experienced in working on the LS will usually start with the COPs when presented with an apparent ETC failure.</p><p></p><p>The COP-induced failure may actually be a possibility here, too, but I don't know enough about GM engine control systems to know if it's likely.</p></blockquote><p></p>
[QUOTE="SoonerP226, post: 2197861, member: 26737"] Just an educated guess, but I suspect that they were replacing the COPs (Coil On Plug). On 2nd Gen LSes ('03-'06), when certain COPs fail (usually on cylinder 4, due to its proximity to the PCM), they can produce RF interference that the PCM sees as a failing ETC (Electronic Throttle Control). When that happens, the PCM goes into fail-safe, or "limp home" mode. A tech experienced in working on the LS will usually start with the COPs when presented with an apparent ETC failure. The COP-induced failure may actually be a possibility here, too, but I don't know enough about GM engine control systems to know if it's likely. [/QUOTE]
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