Question about 2005 Pontiac G6

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Dead cylinder number 2 bad injector number 2

Obd2 scanner reads dead cylinder #2 dead injector#2 alarm goes off randomly now cruse control does not work either check engine light blinks and sometimes stays on rough idle and third brake light stays on after turning car off. HELP!

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Jonah Oneal

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Use a digital volt meter,put it on the ohm scale check number 2 fuel injector should be 11 to 16 ohms if not reads zero fuel injector faulty.if numbe 2 fuel injector okay.use noid light hook it to fuel injector electrical connector with fuel injector disconnected and see if pcm is firing the fuel injector noid light should blink when cranking the engine.if light steady pcm not firing 2 fuel injector,if noid light dont light up.there is a open in the wiring connector 2 fuel injector 2. if fuel injector okay,check spark plug, carbon foul you have a bad ignition coil or wire if you see oil on spark plug you have worn piston ring or leaking valve guides allowing oil to foul out spark a compression test check compression to see condition of the cylinder.

Posted on Sep 02, 2012


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  • 160 Answers

SOURCE: OBD 1 and 2 will not communicate with PCM.

a blown fuse will also cause the obd to not communicate

Posted on Nov 12, 2008



  • 1 Answer

SOURCE: 2002 grand am 4 cylinder rough idle and rough running

Check the ignition control module. Sounds like the exact same problem I have had with mine. Took it to the dealership and the were able to tell me right away. The ignition control module is very easy to replace and is located on the top of the valve cover. Hope this helps!

Posted on Apr 17, 2009


Mike LaPres

  • 757 Answers

SOURCE: trying to read check engine light on my 95 sunfire

Most consumer available scanners read OBDII on 96 or newer vehicles. If your car does in fact have a OBDII plug then all you need is the software in your scanner to be able to read OBDI codes...a 95 is running OBDI. Advance Auto or Autozone might have a OBDI compliant scanner for free...just tell them you have the OBDII port so they don't take up all your time digging for the adapter!

Posted on Jun 19, 2009


  • 1 Answer

SOURCE: tach stops working and trac control light off comes on

It sounds as though your Crankshaft Position Sensor has gone out. They are pretty easy to change. You will have to remove your harmonic balancer/crank pully to get to it, as it is on the inside of the pully. Also, if you have a 3.1 engine, you have a second Crankshaft Position Sensor on the side of the engine closest to your firewall. (it is below the number 1 and 3 spark plug). It could be that one or the one behind the balancer. I would suggest replacing both of them at the same time. As for removeing the harmonic balancer, you should use a puller to do so. When reinstalling it, do not use a hammer or anything to tap it back on, as this can damage the balance and also the crankshaft. You should use a harmonic balancer installer to put it back on. Both the puller and installer can be borrowed from Autozone (with a deposit that will be returned once you return the tools).

Posted on Jul 22, 2009

Efstathios Govas

  • 285 Answers

SOURCE: random/multiple cylinder misfire detected

when u bent the push rod u might have bent the valve in the head ,by puting the longer push rod where it didnt belong it kept the valve open when the piston came up and the force of the piston on the valve bent the push rod,you will have to remove the head,hope this helps

Posted on Sep 20, 2009

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That code means RANDOM CYLINDER misfire. This could be caused by bad spark plugs, Vacuum leaks, air flow sensor, crank sensor etc. IT is not the injectors, o2 sensors or powertrain.

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Disconnect the battery for a few minutes then re-attach. Or, call a local auto parts store and they most likely will read the code and clear it for you. also you can buy one obd2 scanner read and clear the fault coder by yourself if u mean the loud noisy horn alarm
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I have a 1999 Silverado 1500 2WD, it misfires @ 2nd and 3rd shift point until it reaches 210 degrees then the misfiring completely goes away. I have given it a complete tune up. Any ideas??

joking they all do/ really,! but yours is outside normal.

the OBD2 DTC codes clear, no P0300s at all, or the like?

cold misfire.
new spark plugs , using OEM type plugs and gapped to factory spec. not to Autozoned spec. they lie.

misfire can be many reasons
even a leaking EGR main valve.
1: low compression any cylinder. (compression gauge)
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3: bad fueling, (injector balance tests)

there are tests for each , all are simple.
injector clogged or leaking?

is the fuel old?
try techron fuel additive, (i hate additives) but this one is just
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2002 toyota tacoma reading code 300 random misfires, took it to a mechanic he says cylinder #1 is low on compression and i need a new motor

Well, I would probably get a second opinion next.
A random miss code is just that, the computer is seeing a loss of power on different cylinders at random times. If cylinder number one had a dead miss you should get a code 301.
It could be something mechanical such as a burnt valve or bad rings, but that is usually on one cylinder.
At least take it somewhere else and have a compression test done.

Jan 21, 2013 | Toyota Tacoma Cars & Trucks

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I have a 95 camaro with a 3.8l. It had a #1 cylinder missfire code, I found out it had a bad fuel injuector so i replaced it. Now, it's showing a random misfire code. What could cause this change

An intake vacuum leak can cause this as well as other issues, read about it below.
Check Engine Light On, P0300 Random Misfire Code A random misfire means your engine is misfiring, but that the problem is not isolated to one or two cylinders. It is jumping around in a random way from one cylinder to another. A random misfire code usually means the air/fuel mixture is running lean. But the cause might be anything from a hard-to-find vacuum leak to dirty fuel injectors, low fuel pressure, a weak ignition coil, bad plug wires, or compression problems. Even a dirty MAF sensor can cause a lean code and/or misfire to occur. The engine may be stalling because it isn't getting enough throttle opening. The cause is often a problem in the idle air control system. The first thing to check is the intake vacuum with a vacuum gauge. On most vehicles a normal reading is 17 to 21 inches Hg. If the needle is lower, is jumping up and down or steadily dropping, you have a vacuum problem. Look for possible vacuum leaks by checking vacuum hose connections, the throttle body and manifold, and PVC valve and plumbing. An EGR valve that is leaking can also act like a vacuum leak and cause a random misfire. The next thing you should check is the fuel pressure with a gauge. If it is not within specifications (refer to a service manual for specifics because fuel pressure is critical for proper engine performance), the problem may be a weak fuel pump, low voltage to the pump (check the relay and wiring), or obstructions in the fuel line (like a plugged filter). A bad fuel pressure relay can also leak pressure and prevent an otherwise good fuel pump from delivering full pressure to the injectors. Dirty injectors can also restrict fuel delivery and cause a lean fuel condition. Many regular grades of gasoline do not contain adequate levels of detergent to keep the injectors clean. Frequent short trip driving accelerates the buildup of injector deposits. Cleaning the injectors with a good quality fuel tank additive (or having them professionally cleaned) can solve this problem. Look at short term fuel trim (STFT) and long term fuel trim (LTFT) with your AutoTap Express DIY. If the numbers are high, it tells you the engine is running lean

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2007 chev avalance p0300

This is a code for a random misfire. There are better scanners to use to diagnose this problem and they have a list of causes based on probability built right into the scanner. Go somewhere that has the better scanner.

To start with, you have a crankshaft position sensor which sends out a signal to tell the cylinder to fire. It may be loose or messed up. But the signal to fire can be picked up by any wire close to the intended cylinder and it may fire randomly.

Other electrical pulses can get into the system if the shielding has failed. Have your Alternator checked. If the Alternator is arcing inside its casing, then it can interfere with the firing of the plugs. The Alternator may be charging, but spreading stray voltage through the engine block.

Sometimes the better scanners can do tests the cheap scanners can not. You can also have a problem with the injectors instead. If the fuel does not reach the cylinder, the plugs can fire and not have fuel to ignite.

You may not be aware that the onboard computer on your truck can identify 1, 2. or 3 cylinders and Code them as 301, 302, and 303 for instance. Since your vehicle has chosen 300, it means it can not identify an individual cylinder as an error. This means something is going wrong with the firing of 3 or more plugs and it can not pinpoint the problem. It means you probably do not have to worry about an individual plug or injector but rather a main control device.

Something is interfering with the firing signal like a bad crankshaft pickup sensor or wiring connectors or the PCM or the interference by stray power I mentioned.

I hope my solution is helpful to you.

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P0203 - Injector Circuit Malfunction Cylinder 3

Powertrain Control Module (PCM) or Electronic Control Module (ECM) checks the injectors circuit resistance and monitors the voltage drop during normal operation. The PCM/ECM will trigger the P0203 code when the resistance or voltage drop at the injector #3 is out of specifications.

- Open or shorted wiring harness to the injector #3
- Bad injector #3

- If damage, repair injector wire harness or connector
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Same info as the P0203 DTC

P0300 - Random/Multiple Cylinder Misfire Detected

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crankshaft position (CKP) sensor (POS) signal to vary, Powertrain Control Module (PCM) or Electronic Control Module (ECM) can determine that a misfire is occurring.

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- Intake air leak
- The ignition signal circuit is open or shorted

- Perform Injector Service
- Replace Spark Plugs
- Replace Injectors
- Replace Ignition Coils

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Runnig on 2 cylenders from tim to time.

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1997 pontiac sunfire 2.2litre appears number two and four cylinders are dead but all have spark. after running engine for a bit plugs on those dead cylinders are blackish but dry car runs some what better...

sounds as thou thoses 2 clyinders are running rich either from excesive fuel aka bad injectors or drivability issues bad map sensor leaking intake ? need to scan ecm readings check all the sensors ? are you sure coil pack not failing ?

Aug 31, 2009 | 1997 Pontiac Sunfire

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