P0301 Cylinder 1 Misfire and rough idle
09-08-2011, 06:51 PM
#11
How long did it sit for steve? I saw a TSB mentioning failed lifters may cause a squeak or chirp at cam speed(half the engine rpm) so maybe one bled down while it sat.
09-08-2011, 07:47 PM
#12
Ah, it was squeaking... Possibly it could be that simple? I thought it was the belt, so I changed it, and the pulleys. I also have an exhaust leak from those headers, but I think that would cause all of the cylinders to have misfire, not low compression either. I really hope it is top end.
On to your question though, I have no clue. Couldn't have been long, it's an 09, but what did the bulletin say about time? Remember he had that supercharged engine in it (which he tried to sell back for $27,000)...
On to your question though, I have no clue. Couldn't have been long, it's an 09, but what did the bulletin say about time? Remember he had that supercharged engine in it (which he tried to sell back for $27,000)...
09-08-2011, 08:26 PM
#13
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Ah, it was squeaking... Possibly it could be that simple? I thought it was the belt, so I changed it, and the pulleys. I also have an exhaust leak from those headers, but I think that would cause all of the cylinders to have misfire, not low compression either. I really hope it is top end.
On to your question though, I have no clue. Couldn't have been long, it's an 09, but what did the bulletin say about time? Remember he had that supercharged engine in it (which he tried to sell back for $27,000)...
On to your question though, I have no clue. Couldn't have been long, it's an 09, but what did the bulletin say about time? Remember he had that supercharged engine in it (which he tried to sell back for $27,000)...
09-10-2011, 04:29 PM
#15
Turns out it was a bad AFM lifter... but the truck does not have AFM according to the vin... The tech said that all of the bolts have been touched before. This means this is not the engine that originally came in the truck...
What 6.2L came with AFM?
What 6.2L came with AFM?
09-10-2011, 04:34 PM
#16
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Just out of curiosity... did you just upload a new tune into it? When mine gets a bad upload, it does the exact same thing. It doesn't explain low compression, but meh.
...6.2 didn't come with afm.the lifters in 6.2's are bad about collasping also.i've did one with only 40 miles on it.
09-11-2011, 08:47 AM
#18
L99
The L99 is derived from the LS3 with reduced output but adds Active Fuel Management (formerly called Displacement on Demand), which allows it to run on only four cylinders during light load conditions. Applications:
Also I have had my tune for a long time, about 90-120 days to be a little more specific. It was running really well for a long time, then one day I had some serious issues that went away. Then they came back in a much bigger fashion.
The L99 is derived from the LS3 with reduced output but adds Active Fuel Management (formerly called Displacement on Demand), which allows it to run on only four cylinders during light load conditions. Applications:
- 2010 Chevrolet Camaro SS (Automatic Transmission)
Also I have had my tune for a long time, about 90-120 days to be a little more specific. It was running really well for a long time, then one day I had some serious issues that went away. Then they came back in a much bigger fashion.
09-11-2011, 07:15 PM
#19
I promise this truck has an afm engine uder the hood. I held the seperated lifter myself. Its well known that many of the early L92s had afm lifters too btw but I dont think they had the afm lifter manifold, just a standard valley cover. This engine has both afm lifters and the afm valley manifold. I will attempt to snap pics monday if anyone still has doubts.