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I've played with the throttle.. WOT clear flood doesn't help.. cracking the throttle and holding it.. I can't remember, I'll try it tomorrow when I am working on it.

Here's a data log I took today... First attempt was crank no start, I kept the log running, didn't even turn the key off.. It fired up second shot..

I had some advice around possible cam position...

Yes.. Fuel pressure will stay around 50psi when the car sits.. I've diagnosed plenty of GM fuel pump issues in the past, it's common to see fuel pressure drop off a little bit so I've considered this...

Thanks for the info Blindsquirrel.. based on scan data.. The cam and crank sync data looks ok.. both cam and crank sensors are working... It might be worth putting my lab scope on it to check the...

I've got a 1998 Camaro.. Stock LS1.. This is more of a diagnostic issue then a tuning issue...

About 50% of the time when you crank the car it wont start.. 2nd attempt at cranking it, it'll fire...

Here's something to think about and look at... This a partial screen shot during your drag run.. This is the actual data collected from the sensor(don't use the interpolate function when exporting to...

2 cheap high flows with O2 extenders would probably do the trick

GM plug and play connect and cruise stuff is a different animal...all though they use OEM ecu's they aren't the same as the production ones you find in cars. I would contact GM and talk to them about...

I've got an interesting problem land in my lap. I figured why not let a few other eyes take a look at it. It's a stock 2008 F150 5.4L. Customer had a used motor put in it 15,000Km ago. I am told the...

You wont get Evap to set until you get O2 to pass.. Part of the evap monitor requires valid O2 sensor readings in order to set. So it requires that monitor to pass before it will run the evap test.

I looked into this with a Vintage air system. Gen4 PCM's us a LIN bus signal from the HVAC module to tell the PCM the AC command state... There's no way to trick this with a vintage air system unless...

Your aren't looking at a big enough picture to understand whats actually going on in order to make the transmission work and shift. The shift solenoids don't directly control every aspect of the...

I don't see transmission calculated gear ratio being logged. This would give you a better indicator of when the shift was started and completed. reduce the number of pids you are data logging and...

Pictures would help.. On the engine harness There is a purple/white and light green/black which would plug into the output speed sensor. This is the VSS input for the ECM.. The 6L80 instructions show...

Did you ever get anywhere with this?

I am just going to ask a question.. Why is your Base Advance so high during the issues with knock??

Thank you Blindsquirrel. I've been up and down the google search world which is where I am getting the conflicting information from. We'll see where I go with this project. I have a feeling my boss...

If you've got links to those conversations I'd like to read them. This is some of the stuff I am finding conflicting.

You're right about the GMPP OS and if I remove it, I'd be stuck with out it....

Hi Blindsquirrel, from the research I've been doing the hardware side of it has conflicting information. I haven't been able to figure out what makes the GMPP ECU hardware different then a production...

So I've read a couple posts about changing the OS on a GMPP but I seam to have lost track of the posts. Any links people have would be great.

Thanks for that info, I'll have to look at that for the Fan control side of things. All though I was asking about A/C Compressor cut off command signal..

Hey everyone,

I am working on a 67 Camaro project. Slowly working my way threw installing a GM Performance LS 525hp crate engine with the matching wiring harness and ECU. The car is also getting...