Reving engine
#1
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Join Date: Nov 2013
Location: mo
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Reving engine
Does anybody know of a way to rev the engine from the engine bay? It would be useful to be able to do this at times. Also what should be hot idle speed be? Right now it idling at 590-600 rpms. Sorry but one more question, I haave a very slow return to idle after a cold start, is this normal, it idles about 1500-1800 rpm for about 30 sec then slowl drops, This only happens with a cold start. My truck is a 2005 lariet 5.4. Thanks.
#2
Senior Member
Does anybody know of a way to rev the engine from the engine bay? It would be useful to be able to do this at times. Also what should be hot idle speed be? Right now it idling at 590-600 rpms. Sorry but one more question, I haave a very slow return to idle after a cold start, is this normal, it idles about 1500-1800 rpm for about 30 sec then slowl drops, This only happens with a cold start. My truck is a 2005 lariet 5.4. Thanks.
#4
Junior Member
Mine idles about 1300 @ cold start and slowly drops over 20 to 30 seconds and the hot idle is the same as yours. I always thought that was normal operation for cold start.
#7
Senior Member
Google "open loop closed loop" if you want to learn the technical stuff behind why you engine idles high while its cold. The O2 sensors play a big part in this. Completely normal.
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