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2004 MDX failed emissions test. misfire codes on all 6 cylinders.

I have a 2004 MDX that won't pass emissions test because it as codes that say there is a misfire on all 6 cylinders. I took the car to the dealer awhile back because the engine light came on along with the VTM light. They cleared the code and said it was bad gas, but the light kept come back on. one time they said it was because of a bad battery, so new battery put in and the code came back again, still misfireing on all cylinders. is there a TSB's that I can get to help me understand and fix this problem, the dealer wants $500 to do a top engine clean and reset the valves . I can renew my lic. sticker until I can get this fixed...Rob

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  • Anonymous Apr 24, 2009

    2006 MDX, misfire across all 6...

    New EGR valve, new crank sensor, coils, spark plugs, compression 200 on all cylinders.

    I am ready to give up the the car...



6 Suggested Answers

  • 2 Answers

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Posted on Jan 02, 2017

  • 583 Answers

SOURCE: Hi, I have a 1997 Porsche

misfire :-------- try checking your 02 sensors /fuel pump and filter.

for 51 cylinder misfire :---
Change the coil. Period. Very easy to remove from the vehicle if it's a 4 cyl. Follow that spark plug wire from the spark plug to the other end. What it's attached to you should replace
for 54 cylinder 5 misfire :---First you have to eliminate the most obvious problems, like spark plug and spark plug wire. If you replace those and you still have a misfire, then it's a good idea to look for a vacuum leak in the intake manifold

Posted on Mar 07, 2009

  • 32 Answers

SOURCE: 1999 ford windstar has a misfire code

Look at the coil pack, these are known to develop cracks, usually on the underside in the resin, you have to remove it to tell. It is much easier to reomve with the wiper cowl removed.

Posted on Apr 12, 2009

  • 176 Answers

SOURCE: my check engine light came on sunday and i took it

TSB means technical service bulletin, the are bulletin that refer to a certain problem with the car

you should contact your dealership and tell them about the TSB
number, they will tell you about the warranty if it applies.

Posted on Jul 01, 2009

  • 3911 Answers

SOURCE: cylinder misfiring

The cheapest and easiest way to remove a possible cause is to put a set of new, good quality spark plug wires in there. Bad wires, especially where they snap onto the top of the plug, can cause misfires. Do not mix up the firing order, replace one wire at a time.

Posted on Nov 14, 2009

  • 67 Answers

SOURCE: I just gut a new plug and wires on my saturn sl 1

Check the ICM for a good ground.....I think that this engine also had a recall for the ICM...It is located under the coil pack...Its worth a look...

Posted on Feb 12, 2010

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Looking for cylinder diagram/location on 2001 Ford Escape 6 cyl

here's the scoop. There is a TSB that addresses this issue.
First, replace the spark plugs.
Next, replace all 6 COPS, coil on plug. You have to because they feed back into the PCM, Powertrain Control Module and blow the drivers. Then you need to replace the PCM.

This was for 2004-06, but it might apply to yours if it's a 3.0L.
buy at

Misfire DTC codes identify which cylinder is misfiring.

Misfire Detection Monitor The Misfire Detection Monitor is an on-board strategy 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. The Misfire Detection Monitor will be enabled only when certain base engine conditions are first satisfied. Input from the ECT or CHT, MAF and CKP sensors is required to enable the monitor. The Misfire Detection Monitor is also performed during on demand self-test.
  1. The PCM synchronized ignition spark is based on information received from the CKP sensor. The CKP signal generated is also the main input used in determining cylinder misfire.
  1. The input signal generated by the CKP sensor is derived by sensing the passage of teeth from the crankshaft position wheel mounted on the end of the crankshaft.
  1. The input signal to the PCM is then used to calculate the time between CKP edges and also crankshaft rotational velocity and acceleration. By comparing the accelerations of each cylinder event, the power loss of each cylinder is determined. When the power loss of a particular cylinder is sufficiently less than a calibrated value and other criteria is met, then the suspect cylinder is determined to have misfired.
  1. Misfire type A:

    Upon detection of a Misfire type A (200 revolutions) which would cause catalyst damage, the MIL will blink once per second during the actual misfire, and a DTC will be stored.

    Misfire type B:

    Upon detection of a Misfire type B (1000 revolutions) which will exceed the emissions threshold or cause a vehicle to fail an inspection and maintenance tailpipe emissions test, the MIL will illuminate and a DTC will be stored.

    The DTC associated with multiple cylinder misfire for a Type A or Type B misfire is DTC P0300.

    The DTCs associated with an individual cylinder misfire for a Type A or Type B misfire are DTCs P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0309 and P0310.

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