Obd code p0304 came up when scanned
I had same problem on my 03 grand am. Took it to midas to have cat. converter changed today and guy says he didn't think it needed it. He did diagnostics and everything was fine. then he took oil fill cap off with motor running and the lifter for #4 was loose. You look right in with it running and see the one working and the other was dead. Had to take valve cover off and tighten bolt. He said it was worked on before so was done at engine factory and repaired. They had hole too big so it had to be retapped. They had put sleeve on bolt to make it fit in hole at factory. The car runs fine now and ses light is off. I'm calling pontiac monday morning. Hope this helps.
Misfire on Number 4 cylinder. What engine?
It could be any of these plug an injector. Without a scanner it could be hard to tell. What you could do is try switching parts and see if the miss moves. Try moving the plug to the cylinder next to it, the same with the wires if the miss doesn't move, then the same with the coil.
Yes, it will run on 4 cylinders but real rough.
The firing order is 1-2-3-4-5-6 but the wires coil on the coil in this order 1-4-6-3-2-5. The Cat converter efficiency code won't cause the misfire.
Check compression on number 4
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http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
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Misfire on cylinder 4?
http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html
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ABS trouble codes for all models?
http://repairhelpcenter.blogspot.com/2011/11/abs-trouble-codes-for-all-1994-00-acura.html
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Diagnostic code P0010?http://schematicsdiagram.blogspot.com/2011/12/diagnostic-code-p0010.html-------------Diagnostic Code P1396?
http://howtobyme.blogspot.com/2011/11/diagnostic-code-p1396.html
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Code P0452?
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http://howtobyme.blogspot.com/2011/11/obd-code-p0172-on-buick-park-avenue.html
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http://howtobyme.blogspot.com/2011/11/dtc-code-p0321-on-buick-park-avenue.html
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Error Code P0471?
http://howtobyme.blogspot.com/2011/11/error-code-p0471-on-2007-dodge-ram-3500.html
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P0304 Error code?
http://howtobyme.blogspot.com/2011/11/p0304-error-code-on-dodge-neon.html
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OBDII scan is receiving NO BUS CODE?
http://howtobyme.blogspot.com/2011/11/obdii-scan-is-receiving-no-bus-code.html
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How to Clear OBD error Codes?
http://repairhelpcenter.blogspot.com/2011/11/how-to-clear-obd-error-codes-on-acura.html
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Diagnosis and Testing Car Components?
http://vwrepairhelp.blogspot.com/2011/11/diagnosis-and-testing-car-components.html
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Diagnostic Trouble Codes list?
Part 1.
http://repairhelpcenter.blogspot.com/2011/11/diagnostic-trouble-codes-list-for-acura_18.html
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Diagnostic Trouble Codes list?
Part 2.------
http://repairhelpcenter.blogspot.com/2011/11/diagnostic-trouble-codes-list-for-acura.html
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OBD Code is cleared but check engine light will not RESET?
http://schematicsdiagram.blogspot.in/2012/02/obd-code-is-cleared-but-check-engine.html
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Diagnostic Code 43 and 71?
http://schematicsdiagram.blogspot.com/2011/12/diagnostic-code-43-and-71-on-1991.html
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Code P0132?
http://schematicsdiagram.blogspot.com/2011/12/code-p0132-on-acura-tl.html
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P0031 code?
http://schematicsdiagram.blogspot.com/2011/12/p0031-code-on-dodge-dakota.html
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How to get diagnostic Code without OBD Scanner on Pre 1995 cars?
http://schematicsdiagram.blogspot.com/2011/12/how-to-get-diagnostic-code-without-obd.html
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OBD-II Trouble Code P0300?
http://schematicsdiagram.blogspot.com/2011/12/obd-ii-trouble-code-p0300.html
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Getting diagnostic code P0016?
http://schematicsdiagram.blogspot.com/2011/12/getting-diagnostic-code-p0016.html
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How to Read Codes from Check Engine Light?
http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html
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Diagnostic Code P0540 continues to return and the MIL light is on?
http://schematicsdiagram.blogspot.com/2011/12/diagnostic-code-p0540-continue-to.html
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DTC Trouble Code P0401?
http://schematicsdiagram.blogspot.com/2012/01/dtc-trouble-code-p0401.html
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Car misfires and error code P0306 and P0303 is shown?
http://technoanswers.blogspot.com/2012/01/car-misfires-and-error-code-p0306-and.html
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Diagnostic code P0463?
http://technoanswers.blogspot.com/2012/01/diagnostic-code-p0463-on-ford-f250.html
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http://howtobyme.blogspot.in/2012/01/check-engine-light-with-codes-p2195-and.html
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http://technoanswers.blogspot.in/2012/01/diagnostic-error-code.html
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P0174, P0037 and P2197?
http://technoanswers.blogspot.in/2012/02/p0174-p0037-and-p2197-on-toyota-rav4.html
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P0352 Obd code?
http://technoanswers.blogspot.in/2012/02/p0352-obd-code-on-toyota-rav4.html
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Error code p0402?
http://technoanswers.blogspot.in/2012/02/error-code-p0402-on-ford-escape.html
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Obd Code P0763?
http://technoanswers.blogspot.in/2012/02/obd-code-p0763-on-lexus.html
-------
OBD code P0301, P0430 and P0174?
http://schematicsdiagram.blogspot.in/2012/02/obd-code-p0301p0430-and-p0174.html
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OBD code P0500?http://schematicsdiagram.blogspot.in/2012/02/obd-code-p0500-on-lexus-rx-300.html
-----------This will help.Thanks.
http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
----------------
Misfire on cylinder 4?
http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html
--------------
ABS trouble codes for all models?
http://repairhelpcenter.blogspot.com/2011/11/abs-trouble-codes-for-all-1994-00-acura.html
------------
Diagnostic code P0010?http://schematicsdiagram.blogspot.com/2011/12/diagnostic-code-p0010.html-------------Diagnostic Code P1396?
http://howtobyme.blogspot.com/2011/11/diagnostic-code-p1396.html
--------------
Code P0452?
http://howtobyme.blogspot.com/2011/11/code-p0452.html
-------------
OBD code P0172 on Buick?
http://howtobyme.blogspot.com/2011/11/obd-code-p0172-on-buick-park-avenue.html
-------------
DTC Code P0321?
http://howtobyme.blogspot.com/2011/11/dtc-code-p0321-on-buick-park-avenue.html
------------------
Error Code P0471?
http://howtobyme.blogspot.com/2011/11/error-code-p0471-on-2007-dodge-ram-3500.html
-------------
P0304 Error code?
http://howtobyme.blogspot.com/2011/11/p0304-error-code-on-dodge-neon.html
-----------------
OBDII scan is receiving NO BUS CODE?
http://howtobyme.blogspot.com/2011/11/obdii-scan-is-receiving-no-bus-code.html
-----------
How to Clear OBD error Codes?
http://repairhelpcenter.blogspot.com/2011/11/how-to-clear-obd-error-codes-on-acura.html
----------------
Diagnosis and Testing Car Components?
http://vwrepairhelp.blogspot.com/2011/11/diagnosis-and-testing-car-components.html
--------------
Diagnostic Trouble Codes list?
Part 1.
http://repairhelpcenter.blogspot.com/2011/11/diagnostic-trouble-codes-list-for-acura_18.html
--------------
Diagnostic Trouble Codes list?
Part 2.------
http://repairhelpcenter.blogspot.com/2011/11/diagnostic-trouble-codes-list-for-acura.html
------------
OBD Code is cleared but check engine light will not RESET?
http://schematicsdiagram.blogspot.in/2012/02/obd-code-is-cleared-but-check-engine.html
--------------
Diagnostic Code 43 and 71?
http://schematicsdiagram.blogspot.com/2011/12/diagnostic-code-43-and-71-on-1991.html
------------------
Code P0132?
http://schematicsdiagram.blogspot.com/2011/12/code-p0132-on-acura-tl.html
-------------
P0031 code?
http://schematicsdiagram.blogspot.com/2011/12/p0031-code-on-dodge-dakota.html
--------------
How to get diagnostic Code without OBD Scanner on Pre 1995 cars?
http://schematicsdiagram.blogspot.com/2011/12/how-to-get-diagnostic-code-without-obd.html
------------
OBD-II Trouble Code P0300?
http://schematicsdiagram.blogspot.com/2011/12/obd-ii-trouble-code-p0300.html
-------------
Getting diagnostic code P0016?
http://schematicsdiagram.blogspot.com/2011/12/getting-diagnostic-code-p0016.html
--------------
How to Read Codes from Check Engine Light?
http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html
-------------
Diagnostic Code P0540 continues to return and the MIL light is on?
http://schematicsdiagram.blogspot.com/2011/12/diagnostic-code-p0540-continue-to.html
-----------
DTC Trouble Code P0401?
http://schematicsdiagram.blogspot.com/2012/01/dtc-trouble-code-p0401.html
-----------------
Car misfires and error code P0306 and P0303 is shown?
http://technoanswers.blogspot.com/2012/01/car-misfires-and-error-code-p0306-and.html
-------------
Diagnostic code P0463?
http://technoanswers.blogspot.com/2012/01/diagnostic-code-p0463-on-ford-f250.html
-------------
Check engine light with codes P2195 and P2197?
http://howtobyme.blogspot.in/2012/01/check-engine-light-with-codes-p2195-and.html
------------
Diagnostic error code P0121,P0505,P1000,P2101,P2104, P2110,P2135,P2106?
http://technoanswers.blogspot.in/2012/01/diagnostic-error-code.html
--------------
P0174, P0037 and P2197?
http://technoanswers.blogspot.in/2012/02/p0174-p0037-and-p2197-on-toyota-rav4.html
-----------
P0352 Obd code?
http://technoanswers.blogspot.in/2012/02/p0352-obd-code-on-toyota-rav4.html
-------------
Error code p0402?
http://technoanswers.blogspot.in/2012/02/error-code-p0402-on-ford-escape.html
---------
Obd Code P0763?
http://technoanswers.blogspot.in/2012/02/obd-code-p0763-on-lexus.html
-------
OBD code P0301, P0430 and P0174?
http://schematicsdiagram.blogspot.in/2012/02/obd-code-p0301p0430-and-p0174.html
---------
OBD code P0500?http://schematicsdiagram.blogspot.in/2012/02/obd-code-p0500-on-lexus-rx-300.html
-----------This will help.Thanks.
Generally all
vehicles from 1996 and up have an OBD II computer. The Major problem
when it comes to OBD II is that you can no longer acquire the trouble
codes by counting the flashes of the Check Engine light like you could
on earlier OBD I vehicles. You can take your car into a local
high-tech service shop, where the minimum charge for computer
diagnostics and engine diagnostics might cost you somewhere into three
digits. Or you may want to learn about OBD II systems. in order to do so
you will need an OBD II scan tool. I have already done the research for
you and located several different scan tools for you to choose from. If you already have the code and need to know what it means check out our complete list of OBD II Codes Here.
OBD II scan tools connect to the vehicle's computer through a connector under the dash by the steering wheel.
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3.4 liter
is it a bad plug or wire or could it be the coil pack
thanks will try that, would the car run if it was one of the coil packs, running pretty rough right now
checked the code, also said it could be a bad o2 sensor or the cat converter
also could you tell me the firing order please?
Have changed the plugs, wires, one of the coil packs, #4 injector and the ignition module still code P0304 is coming up. am running out of things to change. Could it be the o2 sensor or the egr valve?
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