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Hello,
So I have a 2003 Sonoma SLS 4.3L V6 with 166,000 miles and about a week ago it started idling really rough and then started throwing me a P0301 error code which I know means a cylinder 1 misfire, and I started smelling burning gas coming out of the tailpipe. So the first thing I did was change out all my spark plugs since it was about time to do so anyway.
The spark plug in cylinder 1 was black and burnt, but all of the other spark plugs looked fine. However, after I changed out all of the spark plugs now I get a P0300 multiple random misfire code instead of just the original P0301 code, and the original rough idling still exists.
I then replaced the cap and rotor and the cap did look pretty corroded, but the problem still remains. Also, I did check out all the spark plug wires with an inline spark plug tester and a volt meter for continuity and they were all fine and producing a consistent spark.
Now I am at the point where things get more difficult and more expensive and quite frankly I do not want to be just guessing and replacing items that are not the problem.
So any thoughts, or do you think it is probably a spider fuel injector problem?
One last thing, the truck seems to run fine when it is up to speed. I do not notice any lack of power at speed, it is only rough when idling.
Thanks,
Jerry
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Replies
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If origami suggestion doesn’t work, I would follow Eric’s performance and drivability section:
http://www.ericthecarguy.com/images/faq_buttons/performance_and_driveability_2.png4.3L V6 CPI Fuel Injection is an issue but you need to diagnose if that’s your problem first…this may help: http://troubleshootmyvehicle.com/gm/4.3L-5.0L-5.7L/testing-the-spider-fuel-injector-1
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