CIS - now to learn this system
03-19-2011, 05:33 PM
#1
Racer
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CIS - now to learn this system
For my new to me 79 auto.
I've been reading posts for a couple days now with "CIS" in the title from several searches. I know I need to get a set of gauges... and to check ALL of my vacuum lines....
My car runs beautufully... possibly smooth enough to balance a nickel on the spyder body (ok, maybe not THAT smooth)... but nice and smooth.
My problem is that upon cold startup, it fast idles upwards of 1600-1800 RPM for about 90 seconds... then slowly retreats to a low idle of appx 1000... and no lower.
Vacuum leak? Would that have a proportionately higher RPM value for cold and warm conditions? I'm just getting started, but your insights are welcome.
Thanks!
I've been reading posts for a couple days now with "CIS" in the title from several searches. I know I need to get a set of gauges... and to check ALL of my vacuum lines....
My car runs beautufully... possibly smooth enough to balance a nickel on the spyder body (ok, maybe not THAT smooth)... but nice and smooth.
My problem is that upon cold startup, it fast idles upwards of 1600-1800 RPM for about 90 seconds... then slowly retreats to a low idle of appx 1000... and no lower.
Vacuum leak? Would that have a proportionately higher RPM value for cold and warm conditions? I'm just getting started, but your insights are welcome.
Thanks!
03-19-2011, 05:51 PM
#2
Team Owner
the higher idle when cold is normal but it may be a slight bit too high.
I would investigate the vacuum lines and any other lines that carry air first.
I would investigate the vacuum lines and any other lines that carry air first.
03-19-2011, 08:10 PM
#3
Racer
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Roger that, fast cold idle... I'm with you, it is too high, both cold and warm. I haven't even yet pulled the air cleaner box to fully look around. It may be an easy fix if there's a blatent cracked/broken line. We'll see when I can get it into the garage... 