200% duty cycle on injectors

**89S10_Project** · 07-09-2016

OK looked at it and I do see something about spark advance reading needing to be adjusted in the definition. Here's a question, if it needs to be done to read this ecm and this definition is only for this application, why on earth isn't it already done? That seems a bit like selling someone a car and telling them they're going to have to build an axle.

If I misunderstand and I'm supposed to apply patches to the firmware running on the ECM, well we're right back to my prior statement- I have no way to do so, and am not about to start burning chips before I can see what the motor is doing.'If this is the case, however, I'll be willing to discuss it if someone wants to burn a chip for me and tell me what I'll need to do in order to install it. I believe the first thing I will need to do is to remove the factory chip and solder in a socket, correct?

**lionelhutz** · 07-10-2016

Originally Posted by 89S10_Project

OK looked at it and I do see something about spark advance reading needing to be adjusted in the definition. Here's a question, if it needs to be done to read this ecm and this definition is only for this application, why on earth isn't it already done? That seems a bit like selling someone a car and telling them they're going to have to build an axle.

If I misunderstand and I'm supposed to apply patches to the firmware running on the ECM, well we're right back to my prior statement- I have no way to do so, and am not about to start burning chips before I can see what the motor is doing.'If this is the case, however, I'll be willing to discuss it if someone wants to burn a chip for me and tell me what I'll need to do in order to install it. I believe the first thing I will need to do is to remove the factory chip and solder in a socket, correct?

Well, just don't use the bad data. The rest of the info except the spark advance and duty cycle is likely fine.

**jim_in_dorris** · 07-10-2016

Okay, I figure I had better chime in here. I have a lot of time in the ASDU (350 TBI auto bin) and can tell you for certain that the timing and BPW/Duty cycle numbers you are looking at are only valid on a patched bin. if you use the $42 xdf and ADX, you are looking at valid information for an unpatched bin. Not sure what you are looking at to get the duty cycle numbers, but it isn't to standard $42 adx xdf because I am looking at them right now running a log I made from my truck.

**89S10_Project** · 07-10-2016

Thanks Jim, that is the conclusion that Tom and I came to as well. By which I mean Tom came to, and explained it to me. :)

BTW, love the truck. I'd like to find one like it around here for the wife.

**Six_Shooter** · 07-10-2016

Originally Posted by jim_in_dorris

Okay, I figure I had better chime in here. I have a lot of time in the ASDU (350 TBI auto bin) and can tell you for certain that the timing and BPW/Duty cycle numbers you are looking at are only valid on a patched bin. if you use the $42 xdf and ADX, you are looking at valid information for an unpatched bin. Not sure what you are looking at to get the duty cycle numbers, but it isn't to standard $42 adx xdf because I am looking at them right now running a log I made from my truck.

This is basically what I was about to post, because some people that know how to patch the bin in the ECM took it upon themselves to work on these patches to have the DC and SA data in the datastream. :tup:

So just simply ignore that data, because it won't be relevant for you.

**89S10_Project** · 07-11-2016

Did a test drive this evening, which I logged. I can confirm the truck drives MUCH better now, more power and smoother throttle response. Idle is smooth and there was no occurence of stalling. This problem wasn't related to the faulty indication of the injectors - they're still indicating the same ridiculous number - but the FPR and/or wrong and/or dirty injectors.

**jim_in_dorris** · 07-12-2016

Ok, try this... when looking at data in tunerprort rt, use the daylight dash instead of the tuning dash. It doesn't have the fields for bpw, it will be less confusing.. what happens is to get those numbers, you have to change the data stream by patching the bin. Since your data stream is the stock gm data stream, the 2 fields you are looking at has nothing to do with the data you thought you were looking at. Kind of like looking at a phone number and expecting it to be a street address.

**89S10_Project** · 07-12-2016

Yes I understand this. I have been ignoring the bad data for a while now.

I appreciate everyon's input. This issue is now closed. I have started a new thread with commentary on the logs I pulled from the truck- prominent among those is that I am not seeing VSS data.