Need help with an intermittent issue
#1
Need help with an intermittent issue
2014 Silverado, 5.3 runs just fine until after filling the tank. Will start and run fine right after filling the tank. The next day turns over fine but runs super rough. It’s done this twice. The first time it quit on the way to the mechanic and started running fine. The second time got it to the shop while it was acting up. Mechanic said it was not sparking on cylinder 6 and had no compression on cylinder 8. Decided to take it to a dealer for warranty repairs, it started running fine on the way there and that shop could find nothing wrong with it. first time it did it we replaced spark wires and plugs. Made no difference in how it ran.
Any ideas would be appreciated. Thank you.
Any ideas would be appreciated. Thank you.
#2
CF Monarch
2014 Silverado, 5.3 runs just fine until after filling the tank. Will start and run fine right after filling the tank. The next day turns over fine but runs super rough. It’s done this twice. The first time it quit on the way to the mechanic and started running fine. The second time got it to the shop while it was acting up. Mechanic said it was not sparking on cylinder 6 and had no compression on cylinder 8. Decided to take it to a dealer for warranty repairs, it started running fine on the way there and that shop could find nothing wrong with it. first time it did it we replaced spark wires and plugs. Made no difference in how it ran.
Any ideas would be appreciated. Thank you.
Any ideas would be appreciated. Thank you.
#4
CF Veteran
When it’s running rough, can you smell fuel as if it’s flooding?
Are you having any problems actually filling the tank (such as the pump keeps kicking off as if the tank is full even though it’s not full)?
Are you having any problems actually filling the tank (such as the pump keeps kicking off as if the tank is full even though it’s not full)?
#5
Updates with info
Check engine light is only on when it’s running rough. Only code it’s know to have thrown was a 300 while it was running rough. When running smooth we’ve been told nothing shows up. No actual trouble filling the tank and it runs fine initially after filling. It’s after it sits over night or for several hours after. 72000 miles on the truck.
Thank you for any further information. Darn intermittent issues
Thank you for any further information. Darn intermittent issues
#6
CF Monarch
Check engine light is only on when it’s running rough. Only code it’s know to have thrown was a 300 while it was running rough. When running smooth we’ve been told nothing shows up. No actual trouble filling the tank and it runs fine initially after filling. It’s after it sits over night or for several hours after. 72000 miles on the truck.
Thank you for any further information. Darn intermittent issues
Thank you for any further information. Darn intermittent issues
#7
CF Monarch
Drop some Techron or Seafoam in the tank along with some water remover.
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#8
CF Veteran
The only fuel filter on that will be the sock on the fuel pump - there’s no inline filter.
It may be sucking liquid fuel through the charcoal canister or the purge valve is getting stuck open. Try disconnecting the purge valve line and capping the valve the next time you fill up and see if that makes a difference.
It may be sucking liquid fuel through the charcoal canister or the purge valve is getting stuck open. Try disconnecting the purge valve line and capping the valve the next time you fill up and see if that makes a difference.
#9
CF Monarch
The only fuel filter on that will be the sock on the fuel pump - there’s no inline filter.
It may be sucking liquid fuel through the charcoal canister or the purge valve is getting stuck open. Try disconnecting the purge valve line and capping the valve the next time you fill up and see if that makes a difference.
It may be sucking liquid fuel through the charcoal canister or the purge valve is getting stuck open. Try disconnecting the purge valve line and capping the valve the next time you fill up and see if that makes a difference.
#10
CF Veteran
Inline filters were necessary for carburetors and early FI systems but they do nothing to protect the pump. The filters on pumps today are capable of removing as much particle matter as any inline filter could - I don’t know what micron level they are off hand, but it’s as good as, if not better, than inline filters.
I’m not saying it’s fool proof, but nothing is. You can certainly add an inline filter if you wanted to, but I don’t really see the point when any particulates that could do harm are being removed before they enter the system.