Question about 2004 Pontiac Grand Am

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A handheld automotive diagnostic tool consistently indicates there is a misfire in cylinder 1. My mechanic says he can't find the issue. I feel some hesitation when I accelerate from a stop. Pleas

The diagnostic tool gives a code of 3700.

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Posted on Jan 02, 2017

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SOURCE: My 2001 sunfire is giving the code of a cylinder 1

you either have a faulty spark plug, faulty injector or faulty coil. check your plug for spark first

Posted on Jan 27, 2010

  • 110 Answers

SOURCE: What are the causes of a cylinder misfire on a

there are many causes of cylinder misfire, the most common being ignition. plugs or wires being faulty can cause misfire. also faulty or plugged injectors, loss of compression such as blown head gasket.

Posted on Feb 20, 2010

  • 1374 Answers

SOURCE: my 2002 Grand Am 3.4 is misfiring on cylinders 2 & 3, Hesitates

You have to do a cylinder leakage and possibly an injector balance test test to determine what the problem is what those two cylinders.

Posted on May 24, 2010

  • 553 Answers

SOURCE: the diagnostic read out said I have multiple

It very well could be that a couple of the spark plug wires were accidently hooked up in the wrong firing order.

Posted on Jun 17, 2010

  • 334 Answers

SOURCE: engine stalls or wants to


Posted on Apr 11, 2011

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How do i fix my Mercury Villager 2002 with random misfire?

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P0301 - OBD-II Trouble Code - RepairPal

Dec 17, 2015 | 2002 Mercury Villager

3 Answers

What are the probable causes of DTC P0300?

Most usually a P0300 random misfire on multiple cylinders code is caused by a vacuum leak or low fuel pressure an volume ! Do a fuel pressure an volume test . Also I would do a compression test an a cylinder leak down test .How many miles does the vehicle have , a lot ?
Diagnostic Aids
If the Misfire Index indicates that one bank of the engine is experiencing misfire, the HO2S for that bank may be malfunctioning (i.e. Bank 1 Sensor 1 or Bank 2 Sensor 1). If the Misfire Index indicates that paired cylinders (i.e. cylinders 1-4, 6-3 and 5-2 for V6 applications and 1-6, 8-5, 4-7 and 3-2 for V8 applications) are experiencing misfire, inspect the CKP sensor reluctor ring for damage.
The Misfire Index counts the number of misfires. The scan tool can monitor the Misfire Index. There is a current and history misfire counter for each cylinder. Use the current misfire counter in order to determine which cylinder is misfiring.
Many different conditions could cause an intermittent misfire.
Check for the following conditions:
  1. Check the spark plug wires and the coil wire for the following conditions:
  2. ?€¢
    Ensure that the spark plug wires are securely attached to the spark plugs and the distributor cap.

    Check the wire routing in order to ensure that crossfiring is not occurring.

    If the misfire occurs when the weather is damp, the problem could be due to worn plug wires.

    In order to test for this condition, spray the wires with water. With the engine running, watch for a spark to jump from the wires. If a spark is visible, replace the wires.

  3. Check for contaminated and a low fuel level and the following conditions:
Check the fuel condition and quality. Dirty or contaminated fuel could cause a misfire condition.

If the fuel level is low, contaminants in the bottom of the fuel tank could enter into the fuel metering system.

For more information, refer to Fuel Supply System.



Important: Before clearing the DTCs, use the scan tool to record the Freeze Frame and the Failure Records for reference. This data will be lost when the Clear Info function is used.
Was the Powertrain On-Board Diagnostic (OBD) System Check performed?
Go to Step 2
Go to Powertrain On Board Diagnostic (OBD) System Check

Review Failure Records data.
Are there any other DTCs stored?
Go to Applicable DTC Table
Go to Step 3


  1. Install a scan tool.
  2. With engine idling, monitor the MAP sensor voltage on the scan tool.
Is the MAP sensor voltage greater than the specified value?
Go to DTC P0108 Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage
Go to Step 4

Duplicate the conditions during which the misfire occurred.
Is the DTC active at the ignition cycle?
Go to Step 5
Go to Step 10

Using a scan tool, review the Misfire Index. Is the Misfire Index increasing for more than one cylinder?
Go to Diagnostic Aids
Go to Step 6


  1. Install the spark plug tester J 26792 on number 1 spark plug wire.
  2. Disconnect the fuel injector harness at the intake manifold.
  3. Crank the engine, spark should jump the tester gap.
  4. Repeat for each spark plug wire.
Was the spark adequate on all of the spark plug wires?
Go to Step 7
Go to Step 11

Inspect the spark plugs for wear, excessive air gaps, cracks, or fouling.
Are the spark plugs OK?
Go to Step 8
Go to Step 12


Perform a cyclinder compression test. Refer to Engine Machanical.
Was a problem found?
Go to Step 14
Go to Step 9


Refer to Fuel System Pressure Test .
Is the fuel system OK?
Go to Step 10
Go to Step 13


Misfire is intermittent and is currently not active.
Go to the Diagnostic Aids


Refer to Enhanced Ignition System Diagnosis .


Replace the spark plugs.
Is the action complete?
Go to Step 14


Make repairs as indicated by the Fuel System Diagnosis. Refer to Fuel System Pressure Test .
Go to Step 14


  1. Using the scan tool, select the DTC and the Clear Info.
  2. Start the engine.
  3. Idle at the normal operating temperature.
  4. Select the DTC and the Specific.
  5. Enter the DTC number which was set.
  6. Operate the vehicle within the conditions for setting this DTC as specified in the supporting text.
Does the scan tool indicate that this diagnostic ran and passed?
Go to Step 15
Go to Step 2


Using the scan tool, select Capture Info and Review Info.
Are any DTCs displayed that have not been diagnosed?
Go to the applicable DTC table
System OK
This is GM factory service info

Sep 28, 2015 | 1997 Oldsmobile Bravada

1 Answer

2006 ford five hundred - engine code P0301. When first starts, no issues, but then idle gets rough and car loses power. Miles from home with no tools but willing to do whatever.

P0301 cylinder # 1 misfire !
P030x - Cylinder x Misfire Detected Description: NOTE: x represents cylinder number 1 through 9.
The misfire detection monitor is designed to monitor engine misfire and identify the specific cylinder in which the misfire has occurred. Misfire is defined as lack of combustion in a cylinder due to absence of spark, poor fuel metering, poor compression, or any other cause. Possible Causes:
  • Ignition system
  • Fuel injectors
  • Running out of fuel
  • EVAP canister purge valve
  • Fuel pressure
  • Evaporative emission system
  • EGR system
  • Base engine
Diagnostic Aids: The malfunction indicator lamp (MIL) blinks once per second when a misfire severe enough to cause catalyst damage is detected. If the MIL is on steady state due to a misfire, this indicates the threshold for emissions was exceeded and caused the vehicle to fail an inspection and maintenance tailpipe test. Application Key On Engine Off Key On Engine Running Continuous Memory All - - GO to Pinpoint Test HD . Could be an ignition coil !An to replace it the intake manifold has to come off !

Aug 01, 2015 | Ford Cars & Trucks

1 Answer

1999 Honda Civic LX Stalling/Overheating!!!

(I don't know much about cars so bear with me).

I've had problems of overheating previously where my car's thermostat would hit 140. I think I've fixed the issue, I've replaced the thermostat but it was still doing that and 2 hoses blew and needed to be replaced. I've had to consistently fill my radiator with 50/50 antifreeze on a daily basis to ensure it won't overheat, so far that seems to be keeping the peace.

But now as of 5 days ago, I'm experiencing these new issues of stalling. Upon taking my civic into my mechanic, his meter showed that there was a misfire in the 2nd cylinder a month prior and now all 4 are misfiring. He thought it was the head gasket at first. I had just recently replaced the spark plugs with NGK Platinums, new spark plug wires and a new distributor cap.

I've received many possible culprits to my problem consisting of possibly the Throttle Position Sensor, Fuel Filter/Injection, Distributor or a radiator cap. I'm financially strapped at the moment and only could afford the radiator cap which didn't solve anything, however my radiator is running on 80% water at the moment. I'm really at a loss and I feel like I've done what I could and I'm at my wits end. Please help my poor little Civic cheat death for a little longer.

Sep 11, 2012 | 1999 Honda Civic

1 Answer

2003 Turbo Super Beatle codes indicate coil pacK issues misfiring in cylinders 1 & 3. Codes reveal the following: P0301 & P0303. The diagnostic was performed by Advanced Auto. What do I do?

These code # can be found easily on the you an idea of the issues. the misfiring of the cylinders could very well be a timing issue and the codes indicate a Air to Fuel issue,perhaps explaining the misfires.

Jun 07, 2012 | Volkswagen Beetle Cars & Trucks

1 Answer

When my car is ran on computer is has cose PO300 PD. What does this indicate?

DTC P0300 - Random/Multiple Cylinder Misfire Detected
Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Hope this helps.

Oct 03, 2011 | 2004 Chevrolet Malibu

2 Answers

P305 code we have changed the spark plugs and wires we have replaced the fuel filter and had diagnostics done on the car and the mechanic says there is nothing wrong with the cyclinders

This is what all should be checked:
P0305 indicates the PCM has detected misfires on cylinder number five.
Here are six common problems that may cause OBD trouble code P0305:
  1. Fouled, cracked, worn or otherwise misfiring spark plug (Replaced)
  2. Bad ignition wire - burnt, cracked, carbon tracked wire or plug boot (Replaced)
  3. Defective ignition components - ignition module, ignition coil, distributor cap, etc..
  4. Vacuum leaks
  5. Clogged or otherwise defective fuel injector
  6. Internal mechanical engine fault, ie., low cylinder compression, bad valve, collapsed lifter, etc..
The aforementioned list covers the most common causes of P0305 in the order we feel is most likely to occur based on our past experiences. Certainly, each situation is different and there are other possible causes for cylinder misfires. Here are other causes we've seen (in no particular order).
  • Low fuel pressure
  • Leaking fuel pressure regulator
  • Poor fuel quality - water in gas tank
  • Uneven EGR flow caused by carbon build-up on engine with multiple EGR ports
  • loose or corroded fuel injector wiring
There seems to be a few things that have yet to be checked by your mechanic.
I know it is frustrating when the OBDII codes don't point you directly to the problem. To be hones this is something that I can not solve from here. However I hope that with the above information you can get your misfire detected code to go away after the real problem is discovered.


Sep 26, 2011 | 1999 Toyota 4Runner

1 Answer


What money?

Who is working on it,a repair shop?

Plugs don't fix a misfire
A bad coil would,if you got the correct one.

There are no computers used for any automotive
diagnostic work what so ever,unless you run scan
tool software on your notebook

Need to continue to look at all data related to
whatever problem you now have,since changing
plugs & coil

No check lights on dash, doesn't mean they aren't
stored in data

You could have worn out O2 Sensors,Bad TPS Sensor,
Vacuum Leaks & Evap Issues,& any number of things

Look at fuel trim,timing,smoke test intake & evap

Aug 23, 2011 | 2002 Chevrolet TrailBlazer

2 Answers

2000 saab 9-5 missing really bad starts well just missing code that was read is P0300 please any help?

Hi there,

A P0300 diagnostic code indicates a "random" or "multiple" misfire.

Unfortunately, P0300 doesn't tell you specifically which cylinders are mis-firing, nor why (code P0301 would indicate cylinder #1; P0302 would indicate cylinder # 2 etc). This means there could be an issue with any number of components/circuits relating to the ignition/combustion circuits.

I would recommend you check for the following:

  • Faulty spark plugs and/or HT leads
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor

Sometimes the underlying cause of a random misfire is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold, unmetered air getting past the airflow sensor, or even an EGR valve which is stuck open.

Hope this helps...

Aug 19, 2011 | Saab 9 5 Cars & Trucks

1 Answer

2003 with 3-0 well maitained. truck misfires at slow speeds.mechanic put computer on it and it indicated misfired on #1 cylinder at 1000 rpms changed wires didnt solve the problem. engine light still comes...

A misfire on this type of vehicle can be due to 2 factors if it missing spark it will trigger a misfire code and it you have a bad INJECTOR. Most misfires are due to missing spark but there are quite a few in my experience that were due to bad injectors or bad injector wiring. To check this you need a NOID light disconnect injector wire on suspected cylinder in your case #1 and connect wire to NOID light (engine must be running for this) Your NOID light should have a consistent flickering light going while vehicle runs at idle. If light its NOT flickering at a steady pace and flickers erratically. THE PROBLEM IS A BAD Injector wiring or a bad computer. If light flickers consistently and in a steady pattern then YOU HAVE A BAD INJECTOR. Replace injector and that will solve this problem. I know this is a lot of info but It will help you alot. Good luck and thanks for using FIX YA

Feb 01, 2009 | Ford Edge Cars & Trucks

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