2003 Acura RSX engine misfire

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

15 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 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
Tiny
DERKE0324
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  • 8 POSTS
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
Tiny
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
Tiny
DERKE0324
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  • 8 POSTS
Yea I got engine misfire codes cylinder 1 through 4
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Sunday, November 7th, 2010 AT 10:30 AM
Tiny
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
Tiny
DERKE0324
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  • 8 POSTS
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
Tiny
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
Tiny
DERKE0324
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What test would be accurate
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Sunday, November 7th, 2010 AT 1:48 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
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
Tiny
DERKE0324
  • MEMBER
  • 8 POSTS
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
Tiny
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
Tiny
DERKE0324
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Would timing cause all 4 misfires
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Sunday, November 7th, 2010 AT 2:09 PM
Tiny
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
Tiny
DERKE0324
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  • 8 POSTS
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
Tiny
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

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