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Mastertech 1
Mastertech 1, ASE Certified Technician
Category: Chevy
Satisfied Customers: 2261
Experience:  ASE Master technician with over 30 years of experience, including GM.
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My names ***** ***** i drive a 2008 silverado
, i

Customer Question

Customer: my names ***** ***** i drive a 2008 silverado
JA: Thanks. Can you give me any more details about your issue?
Customer: i recently sucked water into my engine and am now getting a p0307 and p1174 she runs fine until the cylinder deactivation cuts in
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Submitted: 1 year ago.
Category: Chevy
Expert:  Mastertech 1 replied 1 year ago.

Hello: Have you removed the #7 sparkplug to see if it shows and damage to it? Thanks, ***** *****

Customer: replied 1 year ago.
well she fixed herself i was gonna take a look at everything when i got off work. When i cranked her up the check engine light was off and when the AFM cut in she didn't struggle at all
Expert:  Mastertech 1 replied 1 year ago.

Good to hear this, It sounds like there was water on the #7 spark-plug (reason for the code p307, misfire #7 cylinder) Then What happened is the water dissipated from spark-plug and cylinder, Then computer no longer saw a misfire, so it turned off the check engine light! Thank-you, Have a happy New Years!

Customer: replied 1 year ago.
happy new years to you as well. so as i was driving to the store tonight when the AFM cut on she still stuttered a little bit and didnt seem to like it at all. theres still no check engine light anymore. what do you think would cause her to continue to stutter?
Expert:  Mastertech 1 replied 1 year ago.

There is a very good chance that when water entered into the cylinders,it becomes compressed, causing the spark-plug gap to close-up, You should remove at least the #7 plug and inspect for damage (as cheep as they are I would replace them) In many cases the water can damage the firing area of the plug, and the electrode of the plug! Thanks

Customer: replied 1 year ago.
Thanks i'll definitely give it a look
Expert:  Mastertech 1 replied 1 year ago.

Sounds good, Thank-you!