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Why do I idle so low?

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Old Mar 3, 2007 | 01:04 AM
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Tim`'s Avatar
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Default Why do I idle so low?

My car idles @ 500rpm (sometimes it dips to around 400rpm if I creep around @ idle). Is this normal? The oil pressue @ idle seems fine (b/w 30-40psi). The car seems to bog when it dips to 4/500rpm, but never dies.

Have no idea what the previous owner did to it. Maybe it has a retuned pcm (just not sure why anyone would lower the idle??).

Tim
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Old Mar 3, 2007 | 02:55 AM
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dirty air filter??, batt. dying out??..... may just need a tune up, disconnect the batt., clean the maf and throttle body, replace air filter, change plugs (inspect plug wires), clean or replace o2 sensors, ect...
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Old Mar 3, 2007 | 03:12 AM
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^ + make sure that you don't have any air leaking into the air bridge or throttle body, after the MAF
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Old Mar 3, 2007 | 02:21 PM
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Originally Posted by Assassin
dirty air filter??, batt. dying out??..... may just need a tune up, disconnect the batt., clean the maf and throttle body, replace air filter, change plugs (inspect plug wires), clean or replace o2 sensors, ect...
Battery voltage is 14.1v from the dic. They may be original plugs and air filter, car has 33k on it. What should the car idle at?

Tim
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Old Mar 5, 2007 | 01:21 PM
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Sounds like a tuning issue to me. Find somebody with LS1edit, EFIlive or HP Tuners and have it tuned. Headers will make you run rich also. Take it in for a dyno tune if you can. You probably have alot left on the table once they lean it back out.
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