Question about 2006 Chevrolet Cobalt

1 Answer

Engine misfire on cilynders 2&3. I r&r coil pack and same problem. I have good compression at about 160psi, I checked injectors and spark plugs as well, all good, I need help. Possibly ignition module?

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 335 Answers

Hello and welcome. if this is almost always the ignition control module that sets on top off the coil pack. I have seen several of these do this. here is a picture of the control moduleEngine misfire on cilynders 2&3. - mrtechwrench.gif

Posted on Nov 03, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

P0303 cylinder 3 misfire in 2008 Chrysler sebring convertible, changed all spark plugs & coil pack. Engine light continues to come on with this code ?


Recheck all work you have done. Sometimes folks replace the wrong coil pack as they can be easily confusing. If everything seems ok, there are still two possibilities. First, ensure that the fuel injector is consistently firing for the cylinder, and also ensure that it is not constantly firing. Either can cause a misfire, one for too little fuel, one for too much fuel. Lastly, check compression in the suspect cylinder. A broken or burnt valve can cause loss of compression, leading to misfires.

Aug 10, 2016 | 2008 Chrysler Sebring Convertible

1 Answer

2001 buick century P0304 step on gas engine light starts flashing


P0304 is engine misfire #4 cylinder Several things can cause a misfire #1 electrical which you have covered #2 Mechanical Test engine compression is should be around 150 cranking and 120 running . internal valve train components can cause bad compression and the valves then self. #3 fuel injector can be the cause suggest swapping with a know good cylinder and see if misfire follows injector.

Aug 19, 2014 | 2001 Buick Century

1 Answer

I check sparkflug while engine in idle, I try to take out sparkflug 01 and the idle sounds better also no. 04 but the sparkflug 02 , 03 the idle is more high to low


That sounds like your coil pack. The coil to number 1 & 4 may be bad. The other coil, to number 2 & 3 cylinder is good and working.
If it's not the coil, you may have to check the wiring to the coil pack-something is amiss. You could swap the coils around and see if the misfire follows your switch to 2 and 3...
If the above don't get no good results, it's not an ignition problem, then you will need to check compression on number one cylinder. Look for any mechanical problem from low compression. 3 major causes of misfires: gas, spark, or compression.

Mar 16, 2014 | 1996 Mitsubishi Eclipse

2 Answers

Cylinder misfire


If you already replaced all those thing there is only 2 things left that could be causing this problem one(you don't what it to be this one) low compression on cylinder 3 or the cheap fix, the coil pack, I would check the coil pack before checking compression.

Nov 05, 2013 | 2002 Ford Taurus

2 Answers

I have a 2004 ford freestar 3.9 The engine light started blinking and the engine was misfiring. The computer put out a code that cylinder 1 was misfiring. i have replaced the plugs and wires but still...


Hi, the first step I recommend is to check for spark. You can do this by starting the car and then carefully pulling up the boot to the #1 ignition wire at the coil. If sparks are jumping inside the boot, you have spark and the ignition system is working.
jturcotte_504.jpg
1. Ignition: If there is no spark, shut of the engine and use an ohmmeter to check the impedance of the coil. Take the boot off, and connect your ohmmeter from the coil terminal to the engine ground. The resistance should be around 10-20 kohms. If not, replace the coil. If yes, the problem is the ignition module under the coil.

Now, assuming you have spark (which I believe you do, because the coil runs 2 cylinders, and you only have one cylinder that is misfiring), the problem will be a lack of compression or a bad injector (or possibly the injector wiring).

Note: I will provide repair steps once the troubleshooting is complete and the problem identified.
Also, if you do not have a multimeter, you can get one for $10-20 at radio shack or even Walmart. It will save you money overall--or maybe you have a friend that you could borrow a meter from.

2. Injector: The next easiest test to run is to see if the injector solenoid is clicking. You can do this by holding a long screwdriver to the injector and hold the other end of the screwdriver to your ear. With the engine running, you should hear the injector clicking. If not, you have a bad injector or a wiring problem. To determine whether the problem is the injector or the wiring, pull the connector off the injector and measure the AC voltage in the connector with the engine running. The voltage should be 1-2 volts or similar to that voltage of any other injector connector.
If the voltage is good, but the injector is not clicking, replace the injector.

3. Valves/compression: the last possible reason for a misfire is a lack of compression. The intake valve must open to accept a fuel/air charge, and both valves must be closed for the cylinder to fire. Sometimes an exhaust valve will burn and not hold compression. A blown head gasket can also cause this problem. The test we use to check the valves is a compression test. You can borrow or purchase a compression tester if you get to this point. Remove a few of the spark plugs including the cylinder that is misfiring. Screw the compression tester into the spark plug hole and crank the engine for a few revolutions. Record the pressure on the gauge, release the pressure, and go on to the next cylinder. If the pressure is much lower on any cylinder as compared to the highest cylinder, the cylinder head will have to be removed to correct the issue.

Please let me know the results of your troubleshooting and feel free to ask questions as you go.

May 20, 2011 | 2004 Ford Freestar

1 Answer

98 contour code random misfire &# 3 misfire


A code P0303 (misfire #3 cyl) may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.


Keep us updated.

Apr 19, 2011 | 1999 Ford Contour

2 Answers

I have a 99 grand am SE 2.4 4 cylinder and my problem #2 misfire, repalced spark plugs with AC delco rapid fires, replaced coil packs, replaced coil pack housing, changed spark plug boots, had ignition...


A misfire doesn't always have to be ignition... it's just the most common cause. Faulty or plugged injector, low compression. You need to check fuel pressure and test the fuel injector flow. Then check compression. If you don't have tools for these tests, take it to someone who does. Testing is much cheaper than throwing parts at the problem.

Feb 25, 2010 | 1999 Pontiac Grand Am GT

4 Answers

I have a ford explorer 99 but it's giving a error code PO306 what do u think it is


It sounds like a misfire. Check spark plugs 5 and 6. It could be bad fuel, bad plug wire, or weak coil. Check the fuel injectors as well. Other possible causes could be an egr valve stuck open, vacuum leaks, low fuel pressure.

Feb 17, 2010 | 1999 Ford Explorer

1 Answer

Code p306 misfire on injector 6


Random misfires are usually caused by a leaking vaccum pipe, and will only be apparent at idle and sometimes at low engine speeds under part throttle.
Isolated misfires are usually caused by a faulty injector, coil pack, ignition lead, or low compression.

Well, you're going to have to check the spark plug,  spark plug wire, the coil pack, low compression, and the ignition lead, which only really leaves the injector, or even an intake leak at the offending cylinder. 

Start the engine and then spray intake spray or the like around the intake at the offending cylinder and see if the engine note changes. If it does, then you have an intake leak, otherwise, they need to check the injector in the offending cylinder. 

Good luck and hope this helps. It might just be time for a tune up: new spark plugs and wire or some fuel injector cleaner every fill up for now.

May 05, 2009 | 1998 Oldsmobile Eighty Eight

Not finding what you are looking for?
2006 Chevrolet Cobalt Logo

Related Topics:

398 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

80263 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...