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Taydar
Novice
Aug 17, 2021, 1:05 PM
Post #1 of 7
(1500 views)
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Got this code on my 2006 Chevy 6.0L. It's my RV and has 35,800 miles on it. I've had it for about 5 years, 10,000 miles and have not had a bit of trouble with her. Sits to much/long I know :(.
The other day I drove it around and filled it up with gas. Engine was running fine. It was going to sit awhile so I added some gas stabilizer.
Two weeks later I started it up and drove it around the block, the check engine light started flashing. My code reader is showing the PO300. While checking the information on the gas sta-billizer I relished I added twice the amount called for.
I've been checking for vacuum leak with carb cleaner but haven't had any luck. I've also pulled the spark plugs and they all look very good, gaped correctly.
I could use some pointers. Help please.
Taydar
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 17, 2021, 1:55 PM
Post #2 of 7
(1495 views)
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That code is random misfire. I would expect you to find some more codes for specific cylinders. The flashing check engine light means there was a misfire severe enough to damage the Catalytic Converter.
You may also find more codes to give you hints at what is causing the misfire like lean or rich codes.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Taydar
Novice
Aug 17, 2021, 2:45 PM
Post #3 of 7
(1486 views)
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I haven't seen any other codes. I'm only using a code reader. Wouldn't it be good enough to pick up any other codes?
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 17, 2021, 2:50 PM
Post #4 of 7
(1484 views)
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If it's a decent quality code reader it should be picking them up assuming you aren't doing anything that would clear them. It might be worth trying some different equipment to see if there are any others there. There should be something to give you a hint what is causing the problem.
If no further codes are found you will have to rely on the data stream for info.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Taydar
Novice
Aug 17, 2021, 2:56 PM
Post #5 of 7
(1480 views)
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Thank you for replying. I'm still hunting.
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Taydar
Novice
Sep 5, 2021, 4:58 AM
Post #6 of 7
(1202 views)
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Humm I thought I updated this post but am not seeing update. I'll update again, sorry in advance if it comes up repeated.
I finally took my Chevy to a shop and they had no problem finding my trouble. A bad coil was causing my random misfiring fault code.
Replace bad coil and engine is running like new.
I'll have to say the shop had a very nice code analyzer. It could monitor my engine in real time and show a ton of information. The basic code reader I had been using was a toy compared to the shops code analyzer. Not sure I could justify putting out the cash for one that nice but now I've learned the difference between a code analyzer and a code reader.
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 5, 2021, 5:48 AM
Post #7 of 7
(1198 views)
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We try to tell people that all the time. A generic code reader is usually sold for under $100.
A professional, bidirectional scan tool can run in excess of $75,000 with coverage for all vehicles with yearly updates costing $1,000 or more. There are some less expensive models in the $3,000 to $15,000 range that are more common in many shops.
As for your problem, coils are the most common cause of misfires these days. You had a P0300 code meaning more than one cylinder was misfiring. Unless you changed them all you can probably expect more to fail down the road.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Sep 5, 2021, 5:50 AM)
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