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Hunter. Just purchased a 2007 suburban with AFM and I have a

Customer Question
p0300 code JA: Thanks. Can you...
Hunter. Just purchased a 2007 suburban with AFM and I have a p0300 code
JA: Thanks. Can you give me any more details about your issue?
Customer: Well i'm concerned about the AFM. I didn't know much about it until after my purchase. As of now I have a p0300 code which is a random misfire
JA: OK got it. Last thing — Chevy Mechanics generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 1 year ago.Category: Chevy
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Answered in 19 minutes by:
3/30/2016
Chevy Mechanic: mike switzer,
 replied 1 year ago
mike switzer
Category: Chevy
Satisfied Customers: 717
Experience: lead diagnostic tech at Aamco
Verified

are you noticing any drivability issues or do you notice a misfire yourself? also what size engine do you have in this suburban?

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Customer reply replied 1 year ago
I notice the miss. It's very random. Seems to drive fine other than that.
Customer reply replied 1 year ago
5.3
Chevy Mechanic: mike switzer,
 replied 1 year ago

ok thank you for that information. these vehicles have a number of different issues that can cause this in particular. how many miles are on this vehicle?

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Customer reply replied 1 year ago
220k. Somebody has been in the motor though. The heads are real clean and the head gaskets look new.
Chevy Mechanic: mike switzer,
 replied 1 year ago

the most common failure on those engines with AFM is the valve lifters. although i would pull a spark plug and check its condition first. make sure they are new plugs in there. or at least seem to match the condition of the heads.

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Customer reply replied 1 year ago
No valve train noise....
Chevy Mechanic: mike switzer,
 replied 1 year ago

they may not make noise but they dont operate properly for the AFM. common failure point is the cam sensor but i would still check the pulgs first. do you have a scanner by chance? or anyway to do a power balance test?

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Customer reply replied 1 year ago
I have a handheld scanner
Customer reply replied 1 year ago
I'll pull the plugs tomorrow.
Chevy Mechanic: mike switzer,
 replied 1 year ago

is it capable of monitoring data?

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Chevy Mechanic: mike switzer,
 replied 1 year ago

what you will want to do is find where you can see misfire data and while it is running see which cylinder is generating the most misfires while running. it is possible for only one cylinder to misfire and it though a code for random.

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Customer reply replied 1 year ago
I'll check it out tomorrow.
Chevy Mechanic: mike switzer,
 replied 1 year ago

sounds good let me know what happens

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mike switzer
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Category: Chevy
Satisfied Customers: 717
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Experience: lead diagnostic tech at Aamco

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