Question about 2009 Chevrolet Cobalt

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Car idling and jerking while stopped at lights/stop sign

Check engine light is on; need to know where MAF/throttle body/plate is located

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: stalling, 'reduced power' light, and OBD code P1125 Manufacturer control air metering...

These trucks have a drive by wire system,we seen a` lot with a broken ground wire on the rear of the drverside cyl head,this is hard to see just feel and give the wire a tug .If the wire is loose or broken the reduced engine power light will come on.

Posted on Feb 15, 2009

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66 chrgr
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SOURCE: 1999 S10 Blazer 2WD 4.3L V6. Starts hard, idles rough.

you have a single injector under the intake plenum it has 6 branching fuel leads off of this.A very common problem is the regulator attached to this and it leak off fuel which falls into the intake .causing this problem. it needs to be replaced .i have done at least 80 of these in my career.this will fix your problem.thanks for choosing fix ya

Posted on Mar 04, 2009

ftw1952
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SOURCE: car jerks while sitting idle at stop light

Soujnds like your throttle positioning sensor is going bad. This is the sort of thing that happens before they go completely out.

Posted on May 23, 2009

  • 14 Answers

SOURCE: high idle CHevy 350 TBI

check if went from a V6 TO V8 need power two more cylinders

Posted on Jun 21, 2009

  • 25 Answers

SOURCE: I own a 2002 Chevy Trailblazer with 4200 vortec

Do you know if the plugs were changed, a bad or broken plug will also cause rough idle and slow acceleration?

Posted on Oct 21, 2009

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1 Answer

2002 Buick Rendezvous CXL will idle very high & idle too low & stall when going slow or stopping.Replaced IAC valve. Service engine soon light not on, but service vehicle soon light always comes on.


Check for applicable trouble codes. Some of the national brand auto stores will check codes for free.

You may need to clean the throttle body and clean those small passages. With a high idle block off mouth of throttle body, should have a big effect on the idle? There are several issues that could cause idle to act up. Vacuum leak--maf and or map sensor. Don't replace anything unless testing points you in that direction.

Nov 18, 2015 | Buick Cars & Trucks

1 Answer

Car sometimes jerks when idle and wont accelerate when this happens


crank sensors fail on these very frequently,causing running issues. if service engine soon light is on, then your mechanic should be able to pull something from computer. sounds to me like he doesn't know what he is doing. get your self a new mechanic. that light doesn't come on just for fun. it comes on to tell you that there is a problem. if a throttle body is an issue, he should have pulled P0507 ICS system. If so, there may be an issue with the throttle body. have seen few with computer issue causing throttle body code, but those are rare. most likely throttle body, but depend on code number.

Jun 29, 2013 | 2005 Nissan Altima

3 Answers

The check engine light is on and the car is idling high and jerking while stopped?Does anyone know whats wrong with it. I have a 2009 chevy hhr. Thanks


No one is going to know what is wrong with it. You must find out why the engine light is on. The PCM has detected a fault in one or more of its systems. In order to know what the fault may be you must retrieve the codes stored in it. Most auto part stores will hook up a generic OBD II code reader for free. But since its an 09, it should be under warranty. If you tinker with it, can't fix it so then take it to the dealer, they may deny your warranty claim because you worked on it first.

Oct 14, 2011 | 2009 Chevrolet HHR

1 Answer

Engine improper idle and vibration during stop and go traffic light


Hi and welcome to FixYa!

Looks like that you have a faulty MAF (mass air flow) sensor. If the MAF is faulty, erratic idle can be expected and shaking usually occurs. The MAF is located on the throttle body and replacement will surely be helpful.

Have a good one and thank you for using FixYa!

Mar 12, 2011 | Toyota Camry Cars & Trucks

2 Answers

2005 trailblazer... here's what I've had done to stop this problem, new cat. converter, new o2 sensors all around, new plugs... Now $800 later it's still doing it: engine idle at stop signs and red...


Hello: It sounds like you have a throttle with excessive carbon build up, remove the hose (air induction) from the throttle body use a clean soft towel and carburetor cleaner and clean the throttle plate and bore of the throttle body, do not spray an excessive amount of cleaner into the throttle body. After cleaning and reassembly, make sure key is off and disconnect negative (black) battery cable for 15 seconds.

Mar 04, 2011 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

99 sunfire rough idol and sputters and jerks when taking off fromn a stop light.


Hi and welcome to FixYa!

You definitely have a faulty MAF (mass air flow) sensor. The MAF controls the idle of the car that when it's faulty an erratic idle may occur. You may even end up stalling during take off so have the MAF replaced. It is located on the throttle body.

Hope this helps and thank you for using FixYa! Have a good one!

Mar 02, 2011 | 1999 Pontiac Sunfire

1 Answer

01 navigator jerking when sitting at stop and cut off


Spray throttle plate with CRC Throttle Body Cleaner
Spray MAF Sensor with CRC MAF Cleaner

Check COP Ignition Coils for misfires

Any check lights on the dash??

Also try disconnecting the vacuum hoses to
the EGR Valve,plug and test drive.

Jan 31, 2011 | 2001 Lincoln Navigator

2 Answers

My car stalls out sometimes when I'm idling at a stop light


Your throttle body is probably dirty,The throttle body has a hose from the air filter housing attached to it,the throttle body is attached to the intake phlenum.Take the hose off(its rubber with a clamp on it).Do this with a cold engine, NOT RUNNING ! spray some carburetor cleaner inside the venturi and scrub it with a toothbrush,on the side of the throttle body there is a place where a cable goes into,twist the direction of cable to open the throttle plate(inside the throttle body),and continue to clean.Now put it all back together.What happens over a period of time is the Throttle body gets clogged with carbon and cannot breath at idle, the throttle plate when close(at idle)has a very small air gap and cant breath when dirty.If this does not cure your problem,then you will need to consider having your ais motor check.ais= automatic idle speed motor.For this you will have to take the throttle body off to replace it and the screws have been installed with locktight and are tricky to get out.Hope this helps,I did not know what year or make of car, but its a common problem since the fuel injectors took the place of the carburetors.
  • ** Be careful that any cleaners used are for Fuel Injected systems and are O2 sensor safe. Some Carburator Cleaners can damage FI components.**
  • Spraying a throttle body spray cleaner, such as one sold by STP, to clean the throttle body, then starting up and revving the engine, may be enough to dislodge the carbon deposits and material blocking the airway. The original poster's solution is the cheap and easy way to handle this problem of low engine RPM causing stalls. Try it first, it is a fast fix, and it worked for me, causing my engine RPM to go up above the stalling level when my car was idling at a stop sign or red light.


Read more: http://wiki.answers.com/Q/What_causes_an_engine_to_stall_at_idle_but_run_fine_over_1000_rpm#ixzz1CI04ViFN

Jan 28, 2011 | 1988 Volkswagen Cabriolet

1 Answer

My 96 nissan sentra shuts down at times in idle at stop light, allready installed new plugs roter and plug wires


Disconnect the air ducting between the air filter box and the throttle. Clean your throttle body interior with a cloth and plenty of carb choke spray (WD40 is good too). Idling is controlled by the engine's computer and the Idle Air Control Valve IACV . This device allows air passed the closed throttle plate when the engine is at idle. Locate the inlet port in front of the throttle plate in the inside wall of the throttle body. Locate the IACV on the outside of the throttle and remove it. Give it and associated passageways a really good clean. Make sure the valve and valve seat are free of crud. Re-assemble and this should cure the problem

Sep 21, 2010 | 1996 Nissan Sentra

2 Answers

Rough idle


I had the same exact problem on my 2004 Colorado (3.5L). Cleaned the MAF sensor (with MAF sensor cleaner) and throttle body/plate - cleared it right up.

May 10, 2009 | 2006 Chevrolet Colorado

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