Engine Will Not Start

[edcmat-l1]

What MAP sensor is in the vehicle? The linear and offset are set for a 3 bar. If it's a stock sensor, that's a big problem.

Post a pic of the MAP sensor please.

[Obvioustoaster]

Thanks, Alvin. I will try that. Unfortunately, I have no idea what that table should look like. I'll do some digging to see if I can figure it out.

edcmat-11 - No offense taken. I have been playing with muscle cars for 40 years, write programs and do electrical troubleshooting on meteorological towers. So, not exactly no electrical experience. Admittedly, those systems are pretty simple. Most components are switched closure or a potentiometer that ethier work or don't work. I have also avoided computer controlled cars like the plauge, stubborn old man.

[Obvioustoaster]

Here is the MAF. I got the ECM from a local guy who had done a few of these. He said VATS was off and it had a mild tune. He died about a year ago, so can't really ask him for much anymore.MAF.jpg

[edcmat-l1]

Please post a pic of the map sensor or at the very least the part number off it so we can get you setup correctly. That's the first thing that needs to be done before any diag.

You don't sound like an idiot so there is hope LOL

[edcmat-l1]

Here is the MAF. I got the ECM from a local guy who had done a few of these. He said VATS was off and it had a mild tune. He died about a year ago, so can't really ask him for much anymore.MAF.jpg

That's the map, not the maf. But it's what I needed.

[gtstorey]

Here is the MAF. I got the ECM from a local guy who had done a few of these. He said VATS was off and it had a mild tune. He died about a year ago, so can't really ask him for much anymore.MAF.jpg

"with a mild tune" would scare me since no way of knowing what that means in relation to the parts that you have. I would probably consider going back to a stock tune other than vats or at least compare each table to a stock one to rundown what is different and see if your parts match. Looks like at least the map could be off.

[edcmat-l1]

2002 5.3_LS3 map_SD_EH1.hpt

Here you go. Give this a try and see if it pops and bangs.

[Obvioustoaster]

That would be the MAP, sorry.

[edcmat-l1]

2002 5.3_LS3 map_SD_EH2.hpt

Skip EH1 and use this one first. I forgot to fail the maf in the first one.

[Obvioustoaster]

So, the MAF has no numbers just a QR that is too faded to scan. I did have to use an adaptor.

[Obvioustoaster]

Trying to upload a photo but my computer decided I'm done with that. I'll try the tune you sent quick.

[edcmat-l1]

The tune file I posted for you is in speed density. No maf required. Your tune file has a custom operating system applied to it for some strange reason. I'm assuming this isn't forced induction with the plan being 20+ PSI of boost.

My choice would be since this is a swap, start with a completely new GM OS file instead of the 3 bar COS.

[Obvioustoaster]

Still no start, but I do see the MAP table on the upper right of VCM scanner doing things now.

[Obvioustoaster]

Here is a screenshot.

[edcmat-l1]

Screen shot is no help. Need an actual data log of it cranking.

You need a spark tester, noid light and fuel pressure gauge.

[gtstorey]

Here is a screenshot.

If actual cranking screen shot, you are not registering rpm. I think no RPM, no spark.

[Obvioustoaster]

That was just after cranking, working on getting a log of it cranking.

[Obvioustoaster]

Here is a log and a screenshot of it cranking. I do not see RPM in the log but I see it while cranking. The battery is starting to hate life, so its not cranking very fast at the moment.

[Obvioustoaster]

I do see RPM in the log, just wasn't looking at it right.

[edcmat-l1]

Need to add some pids. Need to see PCM voltage and injector ms. Looks to be cranking too slow. Need about 200 rpm out of it. One issue probably is the battery is too low. Need to get a charger on it.