Rough Idle - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 13 (permalink) Old 05-02-2014, 09:59 PM Thread Starter
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Rough Idle

After replacing the battery, spark plugs, coil packs, and ICM I noticed that my car kind of idles funny. I don't believe the RPMs needle bounces either when I feel the car acting weird. I've never taken the throttle body off before to clean it, I've only cleaned it while mounted. Currently there are no codes or lights on. When I replaced the plugs, coil packs, and ICM it did get rid of my misfire code I had. This was about 4,000 miles ago. In a couple of days I'm going to try removing the throttle body to clean it. From what I've read, 2005's have 4 bolts and a wire harness holding the throttle body on so it sounds pretty simple. Is a new gasket needed?

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post #2 of 13 (permalink) Old 05-03-2014, 02:54 AM
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Removed mine last year on a 2006 2.2l to clean it and did not need a new gasket....just assuming the 2005 is the same

good luck and just make sure the key is not in the ignition when you play with the throttle body
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post #3 of 13 (permalink) Old 05-03-2014, 03:08 AM
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And do not spray throttle body cleaner directly into the throttle body. Spray on a rag and wipe the throttle body clean. This way you will not remove butterfly shaft lubricant.

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post #4 of 13 (permalink) Old 05-03-2014, 06:54 AM Thread Starter
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Will I need a new gasket?


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---------- Post added at 09:54 AM ---------- Previous post was at 09:47 AM ----------

Whoopssssss. No ones ever told me not to spray directly into it. I use to use an old tooth brush and do that


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post #5 of 13 (permalink) Old 05-03-2014, 08:33 AM
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I recommend it. I never reuse any gasket, as once it is crushed by torque it will never line back up the way it was

'09 SS/TC - Stolen
Mods - Injen CAI, CIA MAF Relocate CP's, Dejon FMIC,
Custom 3" DP, 3" Exhaust, GT3076R, Pioneer AVH-4100DVD, Hurst STS, ZZP triple pod, Autometer Cobalt boost/DPIC/WB gauges, Nitto NT05 245/40/18's, H&R Springs, 80:20 Meth Spray
Future - KSport Kontrol Pro Coilovers, 10% Tint, FMIC spray
538whp/501wtq @38 psi on meth and 93 oct on stock ish motor


06 EVO IX MR/SE - Sold
Mods - *Updated 10/6/13* AEM TRUboost EBC, 4in custom TBE, SD dual 93/e85 tune, ETS 4in Race Core FMIC, Dual Aeromotive 400lph Fuel Pumps, T4 Tubular Manifold w/ dual WG's, FP Super99HTZ DBB Turbo, GSC 274 mivec cams, ARP headstuds/rod studs, FIC 2150cc Injectors, Aeromotive FPR, Aeromotive Fuel Rail, catch can, Mini Battery Kit, Slim Coolant Fan, Kiggly Racing high pressure valve Springs/Titanium Retainers, Supertech Stainless Steel Valves, Dual VTA Tial 44mm WG's, 4g64 Stroker Manley Pistons, 155mm 2.4 LR Manley Turbo Plus I Beam Rods with ARP 625 Studs, 100mm forged non-billet Manley Crankshaft, Full H/E PNP with Port Matching, Kiggly Racing Girdle, Dual Tial 50mm BOV's, Excedy Triple Disc Carbon HD Clutch, AEM EMS

'95 Ram 2500 Diesel
Mods - 5in TBE, Boost Elbow set to 28psi, Adjusted fuel pump, Open Turbo.

Future Mods- Super Street Clutch (rated @1400ftlbs tq), 67mm turbo, 160lb valve springs, added timing, tubular exhaust manifold, larger injectors, possible 6 spd swap.


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post #6 of 13 (permalink) Old 05-03-2014, 11:10 PM Thread Starter
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Does the gasket have to be applied with anything?


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post #7 of 13 (permalink) Old 05-04-2014, 12:14 PM
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No

'09 SS/TC - Stolen
Mods - Injen CAI, CIA MAF Relocate CP's, Dejon FMIC,
Custom 3" DP, 3" Exhaust, GT3076R, Pioneer AVH-4100DVD, Hurst STS, ZZP triple pod, Autometer Cobalt boost/DPIC/WB gauges, Nitto NT05 245/40/18's, H&R Springs, 80:20 Meth Spray
Future - KSport Kontrol Pro Coilovers, 10% Tint, FMIC spray
538whp/501wtq @38 psi on meth and 93 oct on stock ish motor


06 EVO IX MR/SE - Sold
Mods - *Updated 10/6/13* AEM TRUboost EBC, 4in custom TBE, SD dual 93/e85 tune, ETS 4in Race Core FMIC, Dual Aeromotive 400lph Fuel Pumps, T4 Tubular Manifold w/ dual WG's, FP Super99HTZ DBB Turbo, GSC 274 mivec cams, ARP headstuds/rod studs, FIC 2150cc Injectors, Aeromotive FPR, Aeromotive Fuel Rail, catch can, Mini Battery Kit, Slim Coolant Fan, Kiggly Racing high pressure valve Springs/Titanium Retainers, Supertech Stainless Steel Valves, Dual VTA Tial 44mm WG's, 4g64 Stroker Manley Pistons, 155mm 2.4 LR Manley Turbo Plus I Beam Rods with ARP 625 Studs, 100mm forged non-billet Manley Crankshaft, Full H/E PNP with Port Matching, Kiggly Racing Girdle, Dual Tial 50mm BOV's, Excedy Triple Disc Carbon HD Clutch, AEM EMS

'95 Ram 2500 Diesel
Mods - 5in TBE, Boost Elbow set to 28psi, Adjusted fuel pump, Open Turbo.

Future Mods- Super Street Clutch (rated @1400ftlbs tq), 67mm turbo, 160lb valve springs, added timing, tubular exhaust manifold, larger injectors, possible 6 spd swap.


Master ASE Certified Gasoline/Diesel Technician since 2004

Speed Junkies Social Group

Yourcobalt Official Facebook Page!

Syndicate of Tuners Official Page! Up and going again as of 1/11/13

Click here to PM me if you have questions or issues!
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post #8 of 13 (permalink) Old 05-09-2014, 10:27 AM Thread Starter
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Not much to clean off but this is an after picture. I think the plate is just stained that color.






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---------- Post added at 01:27 PM ---------- Previous post was at 01:26 PM ----------




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post #9 of 13 (permalink) Old 05-11-2014, 07:54 PM Thread Starter
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Still feels like a roughish idle. What next?
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post #10 of 13 (permalink) Old 05-16-2014, 11:53 AM
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Have you tried to clean your mass airflow sensor ?

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