2003 Acura RSX engine misfire

DERKE0324

MEMBER
2003 ACURA RSX
4 CYL
FWD
MANUAL
85,000 MILES

Recently my car had a bad knock sensor and o2 sensor I changed them then the check engine light went off then it came back on for misfire in all cylinders but the car has no sign of misfire while driving it but it does have a rough idle any suggestions what it could be mayb bad maf sensor

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Sunday, November 7th, 2010 AT 9:45 AM

15 Replies

KHLOW2008

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41,814 POSTS

Hi derke0324,

Misfiring could be due to spark plugs and related components or fuel pressure. Get them checked.

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Sunday, November 7th, 2010 AT 10:04 AM

DERKE0324

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The car is running rich but I just changed the spark plugs and coil pack

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Sunday, November 7th, 2010 AT 10:07 AM

KHLOW2008

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Running rich could be due to the following :

1. MAP sensor.
2. Throttle position sensor.
3. Fuel pressure.
4. Injectors.
5. Air filter
6. PCM.

Do you have any trouble codes?
Was anything done prior to this occurring apart from replacing the sensors mentioned?
Is the ignition timing correct?

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Sunday, November 7th, 2010 AT 10:20 AM

DERKE0324

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Yea I got engine misfire codes cylinder 1 through 4

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Sunday, November 7th, 2010 AT 10:30 AM

KHLOW2008

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If only misfire codes are present, you would need to check/test those components that can cause them.

A scan tool to monitor the data stream might be helpful.

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Sunday, November 7th, 2010 AT 10:38 AM

DERKE0324

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So yu don't have any idea what it could be causing the misfire in all cylinders

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Sunday, November 7th, 2010 AT 10:42 AM

KHLOW2008

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The possible causes have been listed out for you. You need to perform test to find out.

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Sunday, November 7th, 2010 AT 10:47 AM

DERKE0324

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What test would be accurate

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Sunday, November 7th, 2010 AT 1:48 PM

KHLOW2008

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A scan tool to monitor the datastream would be the most accurate.

Did you check the igniton timing?
What have you checked?

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Sunday, November 7th, 2010 AT 1:58 PM

DERKE0324

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I didnt really check anything how do you check the ignition timing I mean the car drives fine no misfire whiling driving or anything just has a rough idle but says all 4 cylinders are misfiring

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Sunday, November 7th, 2010 AT 2:04 PM

KHLOW2008

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The rough idle indicates the possibility of misfiring.

Ignition timing can be checked with a timing light.

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Sunday, November 7th, 2010 AT 2:07 PM

DERKE0324

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Would timing cause all 4 misfires

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Sunday, November 7th, 2010 AT 2:09 PM

KHLOW2008

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Yes, if the ignition timing is out of specs, it can cause misfiring. Possible cause would be the cam timing that is out or the PCM needs to be updated or replaced.

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Monday, November 8th, 2010 AT 6:25 AM

DERKE0324

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If my car has low compression. Will it still be able to drive what are some symptoms of low compression

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Monday, November 8th, 2010 AT 7:42 AM

KHLOW2008

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When compression are low, longer cranking time would be required when starting.
Performance would be affected. Lack of power might not be too noticeable unless under loaded driving conditions.

Richer running condition due to reduced intake air volumn.

If vehicle can be started, you can drive without any problem.

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Monday, November 8th, 2010 AT 7:54 AM