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Multiple issues over the last 6 months (idle / injectors)

 
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AfterLyfe
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Location: Toronto, ON

2004 Chevrolet Impala


PostPosted: Tue Oct 11, 2016 5:23 pm    Post subject:  Multiple issues over the last 6 months (idle / injectors) Reply with quote

Good day,

I'm having a bit of an issue with my Impala, and I hope you can help me out.

Background information:
I have an '04 SS with about 156,000 km / 97,000 miles. Over the past 6 months, 80% of my driving was highway, between Trenton, Toronto, and Sarnia (all Ontario). Only modification to the car is a K&N Air Intake, which has been sitting there for the last 5 years. (Filter gets cleaned when it looks gummed up). I do have a heavy foot when I drive, but I always roll on the throttle when I have to accelerate quickly, instead of just putting my foot all the way to the floor. (I honestly don't know if this last bit of information will help you, but there it is)

Problem history:
About 4-5 months ago, I've had an issue with a rough idle, and occasional stalling when coming to a stop in drive when the car was fully warmed up. Cleaned my throttle body and the idle air control valve, and everything seemed to go back to normal. About 2 months ago, my idle would be very inconsistent in reverse, and more noticeable when turning the steering wheel to the left. It was as if the engine was having to work harder, and was unable to rev the RPMs up fast enough. This caused it to rev to bounce, reaching almost 1200. Also smelled very rich when that was happening. I replaced the idle air control valve, and again, the issue went away. Around that time, I also got a code for a vacuum leak. I re-tightened my gas cap, cleared the code, and it has not returned since.

Now, a few weeks ago, I began having idle problems in reverse again, and then got 2 codes: 1 for misfire in cylinder 3, and another for open injector circuit in cylinder 3. Replaced the injector, and again, no issues for a bit. Now earlier last week, same thing, but for cylinder 4 this time. Again, replaced the injector, and things were fine until yesterday. Now I have a code 0135 for Oxygen O2 Sensor Heater Circuit (Bank 1, Sensor 1).

I'm wondering if I've just been unlucky, or there is a worse underlying cause to all of this.
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pdb
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Joined: Apr 15, 2010
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Location: Winston-Salem, NC

2004 Chevrolet Impala


PostPosted: Wed Oct 12, 2016 9:28 am    Post subject:   Reply with quote

I had similar issues that went away after I replaced the MAF sensor. Still sounds like you might have a vacuum leak, though.
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AfterLyfe
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Joined: Mar 17, 2010
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Location: Toronto, ON

2004 Chevrolet Impala


PostPosted: Thu Oct 13, 2016 8:43 am    Post subject:   Reply with quote

Thank you for the reply. I'll definitely look in to that. Still having an inconsistent idle.

I'm more concerned about the injectors and sensor failing. Could a vacuum leak or improper air amount delivered to the engine be responsible for something like that?
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ScottMPala
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2003 Chevrolet Impala
2004 Chevrolet Impala


PostPosted: Sun Oct 16, 2016 10:35 pm    Post subject:   Reply with quote

AfterLyfe wrote:
Thank you for the reply. I'll definitely look in to that. Still having an inconsistent idle.

I'm more concerned about the injectors and sensor failing. Could a vacuum leak or improper air amount delivered to the engine be responsible for something like that?


don't forget, oiled filters can wreak havoc on our MAFs and a dirty MAF can cause all sorts of issues. I had a lean code last week on my 02 regal s/c. cleaned the MAF and drove it 1600 miles on a road trip and hasn't come back. I had had a mechanic friend scan it for my and my fuel trim was @ 16% above normal and at 25% it maxes out. haven't scanned it since then but no engine light. clean the MAF and clear your codes. It does sound like you have other issues, but a clean MAF can't hurt.

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