Just installed 6.0, getting misfire/flashing SES light.
03-20-2010, 10:25 AM
#1
Just installed 6.0, getting misfire/flashing SES light.
Ok, so I just "finished" my 6.0 swap, and it does run.
The current setup is an LQ4, with a 216/224 .561/.568 114, and open LTs (trying to get the y-pipe modified later today), TT3000, and an FLT level 5.
If it idles for more than a few seconds, it starts misfiring, and the SES light flashes.
If I start driving before the misfire appears, the light doesn't come on, and it seems to run right for the most part, but as soon as I stop and let it idle, the misfire comes back/SES light flashes. If I start moving again, it misses like crazy.
If I shut the truck off and start it again, and start driving before the misfire(s) appears, the light stays off.
I am about to go out and buy a code reader, so that should provide some more info soon, and yes, the truck is tuned for the modifications (probably not perfectly, but I sent the PCM down to Justin at Black Bear, and he adjusted for everything the best he could without the truck there).
Basically what I'm wondering, is has anyone else had this issue, or can you see anything that stands out in my setup that would cause this?
Thanks a bunch for any help, I need to get this thing running right, I go back to school on Monday.
EDIT: I've also been told that I may need a crank relearn done, but if that were the case, wouldn't the misfire be constant?
The current setup is an LQ4, with a 216/224 .561/.568 114, and open LTs (trying to get the y-pipe modified later today), TT3000, and an FLT level 5.
If it idles for more than a few seconds, it starts misfiring, and the SES light flashes.
If I start driving before the misfire appears, the light doesn't come on, and it seems to run right for the most part, but as soon as I stop and let it idle, the misfire comes back/SES light flashes. If I start moving again, it misses like crazy.
If I shut the truck off and start it again, and start driving before the misfire(s) appears, the light stays off.
I am about to go out and buy a code reader, so that should provide some more info soon, and yes, the truck is tuned for the modifications (probably not perfectly, but I sent the PCM down to Justin at Black Bear, and he adjusted for everything the best he could without the truck there).
Basically what I'm wondering, is has anyone else had this issue, or can you see anything that stands out in my setup that would cause this?
Thanks a bunch for any help, I need to get this thing running right, I go back to school on Monday.
EDIT: I've also been told that I may need a crank relearn done, but if that were the case, wouldn't the misfire be constant?
03-20-2010, 10:40 AM
#3
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That's what I was gonna say, check the harness for the ignition coils. I had a similar problem after swapping in 6.0, turned out the harness was connected good enough.
03-20-2010, 12:02 PM
#4
I sprayed some carb cleaner around the intake manifold, and everywhere else that could cause a leak after the MAF, and no change, so I don't think it's a vacuum leak (just trying to eliminate as much as possible).
Just got back from picking up a code reader, I'll find out exactly what code it's throwing and report back in a few.
