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post #1 of 7 (permalink) Old 03-02-2018, 06:05 AM Thread Starter
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High Idle Issues

Hey guys! I purchased my Cobalt SS SC about 2 weeks ago. I had to fix a few things so I had not got to drive it a whole lot. One thing that I have noticed is that it seems to idle high. It wants to idle around 900rpms when warm which I feel is high. Driving back and forth to work I've noticed that if you throw the car in neutral and coast to a stop, the idle will hang around 1800rpm until you almost come to a complete stop. You will be coasting up by the cars at the stop light and as you almost come to a complete stop, it will drop down to around 900rpm. I haven't hooked my scanner up to it to monitor TPS to see if the TPS sensor in the throttle body is screwed up or not. Any thoughts?

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post #2 of 7 (permalink) Old 03-02-2018, 07:14 AM
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900 really isn't that high, I think mine idles right around there...but I haven't driven it since November, so I don't really remember.

1986 Chevrolet Camaro IROC-Z - Wrecked/Sold
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2007 Chevrolet Cobalt LT - M62 Supercharger, Ported Throttle Body, 42 lb/hr Injectors, Intense 2.9" Pulley, Cobra Heat Exchanger, SS/TC Exhaust, TTR Engine and Trans Mounts, Trifecta Tune, ZZP Header and Downpipe, '08+ FE5 Struts/Shocks, SSC Springs, FE5 Control Arms, SS/SC Front Swaybar, Powell Hardcore Rear Swaybar, 18" MSR 045s, Dunlop ZIIs, Nightshaded Tails/Side Markers, Shorty Antenna, Black Bowties, Black Grilles, Black Headlights, Dual JL 12" w1v2 Subs, A/D/S Front/Rear Speakers, Pioneer 7" Touchscreen, G85 Recaros, Leather Rear Seats, 160 MPH Cluster.
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post #3 of 7 (permalink) Old 03-02-2018, 07:57 AM Thread Starter
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What about the coasting idle? That part is pretty annoying. It sticks to around 1900 when coasting and it drives me insane.
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post #4 of 7 (permalink) Old 03-02-2018, 08:08 AM
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1900 is high...is it that high when you just clutch-in and when you shift to neutral?

1986 Chevrolet Camaro IROC-Z - Wrecked/Sold
1998 Chevrolet Cavalier - Wrecked/Donated
2007 Chevrolet Cobalt LT - M62 Supercharger, Ported Throttle Body, 42 lb/hr Injectors, Intense 2.9" Pulley, Cobra Heat Exchanger, SS/TC Exhaust, TTR Engine and Trans Mounts, Trifecta Tune, ZZP Header and Downpipe, '08+ FE5 Struts/Shocks, SSC Springs, FE5 Control Arms, SS/SC Front Swaybar, Powell Hardcore Rear Swaybar, 18" MSR 045s, Dunlop ZIIs, Nightshaded Tails/Side Markers, Shorty Antenna, Black Bowties, Black Grilles, Black Headlights, Dual JL 12" w1v2 Subs, A/D/S Front/Rear Speakers, Pioneer 7" Touchscreen, G85 Recaros, Leather Rear Seats, 160 MPH Cluster.
2014 Chevrolet Cruze Diesel - 17" MSR 013s, Black Bowties, Black Tails, UR Rear Lower Bar
1981 Chevrolet Camaro Z28 - JVC Ribbon Tweeters, SEAS Mids, Pyle Woofers, Kenwood Tape Deck, Zapco Amp/Equilizer, Ceramic-Coated Longtubes, 2.5" Pypes Stainless Exhaust, Bilstein B6 Shocks, GW U/L Control Arms, Hotchkis Springs Sway Bars, DD HDX Cluster
2017 Chevrolet Volt LT - Black Bowties
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post #5 of 7 (permalink) Old 03-02-2018, 08:18 AM Thread Starter
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Yeah, it's like 1800/1900 somewhere in there. Does it if you push the clutch in or throw it in neutral. I do believe that is only if you are higher rpm than that when you shift. It seems to just hang there....Once you come down to 2-3 mph it drops and idles like normal.
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post #6 of 7 (permalink) Old 03-02-2018, 08:24 AM
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Based on a quick search on "the other forum" (CSS.net), it sounds pretty common with the SS/SC to have a high idle when coasting, with no real explanation why.

Probably all the more reason to engine brake, haha.

1986 Chevrolet Camaro IROC-Z - Wrecked/Sold
1998 Chevrolet Cavalier - Wrecked/Donated
2007 Chevrolet Cobalt LT - M62 Supercharger, Ported Throttle Body, 42 lb/hr Injectors, Intense 2.9" Pulley, Cobra Heat Exchanger, SS/TC Exhaust, TTR Engine and Trans Mounts, Trifecta Tune, ZZP Header and Downpipe, '08+ FE5 Struts/Shocks, SSC Springs, FE5 Control Arms, SS/SC Front Swaybar, Powell Hardcore Rear Swaybar, 18" MSR 045s, Dunlop ZIIs, Nightshaded Tails/Side Markers, Shorty Antenna, Black Bowties, Black Grilles, Black Headlights, Dual JL 12" w1v2 Subs, A/D/S Front/Rear Speakers, Pioneer 7" Touchscreen, G85 Recaros, Leather Rear Seats, 160 MPH Cluster.
2014 Chevrolet Cruze Diesel - 17" MSR 013s, Black Bowties, Black Tails, UR Rear Lower Bar
1981 Chevrolet Camaro Z28 - JVC Ribbon Tweeters, SEAS Mids, Pyle Woofers, Kenwood Tape Deck, Zapco Amp/Equilizer, Ceramic-Coated Longtubes, 2.5" Pypes Stainless Exhaust, Bilstein B6 Shocks, GW U/L Control Arms, Hotchkis Springs Sway Bars, DD HDX Cluster
2017 Chevrolet Volt LT - Black Bowties
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post #7 of 7 (permalink) Old 03-02-2018, 09:01 PM
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What year SS did you score?

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