Do you have a log file of that...?Originally Posted by ja_engineer
Do you have a log file of that...?
I will take one tonight and post it.
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I attached the log showing the surging at constant rpm. I checked the tps and map via the scan tool and they both seem to be fine. I have checked for additional vacuum leaks and have not found any. I noticed tonight that it only seems to occur above about 1000 rpm and the surge seems to get more pronounced with increased throttle/rpm. If I give it a quick rev it will be fine but if I give it successive revs it will cut out and almost die after the first rev.
Interesting... looks like some air/fueling/spark loop... can you post your tune file.
Joecar the first file is the current tune that I am using (segment swap, modified maf tables and injectors) and the second file is the original tune extracted from ecu when I first got the engine, which as far as I know is the stock tune.
Thanks for your help!
Joecar do you think it's possible the pcm is bad? Tonight I did a full flash of a 4.8 manual tune (could not find a 6.0 manual tune) and copied in the engine tables and it still did the same. Everything is fine until about 1300 rpm then it starts stumbling like in the video.
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When you did the segment swap, did you do a full flash...?
Do you have another PCM to try...?
Yes I did do a full flash with the segment swap. I only have the the PCM but could look on eBay for another one. I have a spare 512k pcm but not a 1k.
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I full flashed the original auto tune in and disabled all of the auto stuff and it seemed to fix the problem. It will rev fine now. I am going to compare settings/tables between the two and see if I can spot the offending settings. Unless the segment swap some how corrupted the tune?
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