Flashing SES- P0300 code - Details

Many people are now watching TV and becoming more familiar with tuning. The Lingo talks about individual cylinder tuning with Timing or fuel. Neither is available with the stock ECM.   - Again, you cannot tune any cylinders individually - Not fuel Or Spark, we cannot dial in different fuel mixtures in each cylinder to balance 

If there is a flashing engine light or  P0300 for cylinder misfire 

There are no Codes in GM Trucks' logic for individual cylinder misfires - Meaning there is NO Code in the system showing that's ever going to show up to tell you which exact cylinder has a problem - nothing shows cylinder 1 misfire - cylinder 5 misfire. There is one single code that is P0300 - That's it 

You will have to add the channels for current misfires with hptuners and read the data -  

When adding channels, select CURRENT misfires - Not history misfires with a camshaft. Normally, it will show some small single digits at idle when a cylinder is reading 20-30. That's a problem when it is reading 50-100, which would be 100% dead and not working 

Misfires are NOT a tuning issue for single cylinders - that means if you are getting a flashing engine light for cylinder 3, this is NOT a tuning issue. Again, this is not a tuning problem, and you will have to mechanically check this further 

After 5 Emails and constant mechanical issues that limit us from tuning, we charge a retune fee of $125.00 

99% of the time, this is something with Plugs and wires to start with - Most are running stock plugs in a modified engine or running way too large a plug gap 

And as always, we need log files - without log files, we cannot advise you - we cannot see progress, better or worse, so we need logs to help us help you