da_fugative_7 Posted August 21, 2009 Share Posted August 21, 2009 My 91 LS 400 usually idles @ 1000 RPMS...but I noticed that this week is has dropped to 400 RPMS and it still starts strong, runs strong and doesn't shut off...should I be worried or concerned? Is it an engine problem or do I need a tune up or wires replaced or checked....? Has anyone had this problem and it so, how did they get it fixed..? Quote Link to comment Share on other sites More sharing options...
dcfish Posted August 21, 2009 Share Posted August 21, 2009 1k RPM is high to begin with, I beleive the normal idle is around 550 RPM. Quote Link to comment Share on other sites More sharing options...
VBdenny Posted August 21, 2009 Share Posted August 21, 2009 When at temperature, my 90 LS has a 600 RPM idle rate and always has. Rock steady. Quote Link to comment Share on other sites More sharing options...
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