Mendes0311
Junior Member
I’ve recently purchased an 09’ 1500 Laramie with the 5.7L Hemi, it has 183K miles and I purchased it to be a winter truck as well as for trips to Home Depot kind of thing. I’m only planning on putting about 3K miles on it a year and figured it will last me many years with the proper maintenance.
The vehicle has its entire service history documented and visually it’s in great shape. I drove it from Wisconsin to Massachusetts (1,150 miles) with no issues at all, however the next day after getting home a check engine light came on.
I used a “Blue Driver” WiFi diagnostic and it gave a misfire code for cylinder 8 (P0308), but of course when I took it to the dealership they’re telling I need an entire cylinder head replaced for $2,500 with parts and labor.
Thanks but no thanks, the next day the check engine light is no longer on and the truck is no longer idling roughly like it was when the light was on. I’ve driven it 250 miles since the check engine light disappeared by itself and it had no issues.
Does it make any sense that a whole cylinder head needs to be replaced if I got a code for a single cylinder?! Everything I read seems to points to simpler parts replacement.
Also I was using 87 octane with 10% ethanol when I drove it home from Wisconsin and am now using 89 octane with no ethanol. Different gasoline grades available from the upper Midwest to New England. Could the the cheaper 87 w ethanol have caused the misfire? Has it stopped because of me now using the 89 w no ethanol?
Please, any experienced owners or mechanics, your opinions would be greatly appreciated!
The vehicle has its entire service history documented and visually it’s in great shape. I drove it from Wisconsin to Massachusetts (1,150 miles) with no issues at all, however the next day after getting home a check engine light came on.
I used a “Blue Driver” WiFi diagnostic and it gave a misfire code for cylinder 8 (P0308), but of course when I took it to the dealership they’re telling I need an entire cylinder head replaced for $2,500 with parts and labor.
Thanks but no thanks, the next day the check engine light is no longer on and the truck is no longer idling roughly like it was when the light was on. I’ve driven it 250 miles since the check engine light disappeared by itself and it had no issues.
Does it make any sense that a whole cylinder head needs to be replaced if I got a code for a single cylinder?! Everything I read seems to points to simpler parts replacement.
Also I was using 87 octane with 10% ethanol when I drove it home from Wisconsin and am now using 89 octane with no ethanol. Different gasoline grades available from the upper Midwest to New England. Could the the cheaper 87 w ethanol have caused the misfire? Has it stopped because of me now using the 89 w no ethanol?
Please, any experienced owners or mechanics, your opinions would be greatly appreciated!