Misfire in cylinder 3, traction control light coming on and off

Tiny
ISITONU2
  • MEMBER
  • 2006 CHEVROLET IMPALA
  • 3.9L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 185,500 MILES
Having an issue with a misfire in cylinder 3. Replaced spark plugs, wires, all fuel injectors, and now the coil pack.

My traction control light also is coming on. When this comes on, the engine light flashes instead of remaining solid. The car also runs really bad, feels like it's chugging and missing worse. When the light is off is still misses but it's not nearly as bad.

I have no idea what else to do at this point.
Saturday, December 28th, 2019 AT 5:23 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

It sounds like the traction control is actuating and reducing engine power. You indicated a misfire all the time. I have to be honest, at this point I don't think the two are related. I do, however, feel one makes the other worse. Also, I have to assume you had the computer scanned to know it's a cylinder 3 misfire.

When you had it scanned, were there any codes other than a P0303? Was the scanner used able to read codes other than just engine codes? I ask because I question if you have a wheel speed sensor going bad and causing traction control to kick in.

Let me know.

Joe
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Saturday, December 28th, 2019 AT 10:40 PM
Tiny
ISITONU2
  • MEMBER
  • 2 POSTS
First time it got scanned it was a misfire on number 2, after we replaced the fuel injector for 2, the code said misfire in 3.

I had them read the codes a few times at the auto store and I believe the traction control one said it was ABS related. Ill have to try and get them read again this week. Its a hassle because sometimes the traction light isn't on and sometimes it is.

I think I am going to make an appointment this week and see if someone can figure it out. Could a sensor be causing this much trouble because it is running rough?

Before we did all the work, it was pouring smoke out of the exhaust that smelled like gas. Now sometimes it smells like it's burning something when the traction control light is on but it's not pouring out a bunch of smoke.
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Sunday, December 29th, 2019 AT 7:47 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

Crazy question. How bad can you feel the misfire? Also, can you get your hands on a live data scanner? If I knew the short term fuel trims, it may help me figure this out. Also, the idea you smell something burning is a concern. Do me a favor. If you smell it again, look under the vehicle at the catalytic converter. I wonder if it was damaged when you had the bad injector which was causing all the smoke and now it's plugged. I have actually seen them glowing red hot when plugged. Take a look through these links:

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

As far as the traction control, chances are you have a bad wheel speed sensor. The problem is the parts store doesn't have a good enough scanner to identify such codes and which wheel. Make sure the brake fluid isn't low, too. I have seen low fluid cause the traction control, ABS, brake light and so on turn on.

Let me know.

Joe
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+1
Monday, December 30th, 2019 AT 10:41 PM
Tiny
CLAY COVINGTON
  • MEMBER
  • 1 POST
Did you ever figure this issue out ISITONU2? I’m having the same exact issue now with my 2015 Tahoe.
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Thursday, June 15th, 2023 AT 4:17 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
This post is for a 2006 Chevrolet Impala. Please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken
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Friday, June 16th, 2023 AT 7:30 AM

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