Up thru 2007 they all kept the same wording about loss of CMP behavior, 2008 it's strangely not mentioned one way or the other, then 2009 it changes to what's quoted up above about being able to run on only the CMP. So they did change something fundamental about how it works during that time.
We sprayed starter fluid to record a log. Looks like the injectors shut off immediately after starting. What could cause this? I have VATS off. I wrote entire when I turned VATS off.
1981 C10 LOG4 5-7-24.hpl
Last edited by angelm_ix; 1 Week Ago at 04:46 PM.
Why does MAP never change from 59 kPa? Why 'OL - Fault'?
Depending on what components you re-used in this swap, man alive do you have a bunch of DTCs that need attention. EVAP? ABS? BCM? Cats & downstream O2s? There's also a theft deterrent DTC still enabled. I was going to list them all but it got to about 20 and I gave up.
OK, so how did this file get a 2-bar speed density OS applied? That's your problem. The new VE tables are filled with zeroes. The defaults for MAP linear/offset also get changed with the OS.
And figure out what's wrong with the MAP pinout, those are often swapped around too. Some of the swap harness companies don't realize there are multiple different pin arrangements for different sensors even though they take the same connector. MAP should have changed in that log even given the missing VE and incorrect linear/offset issues.
I've seen em run with the VE table all zeros. Think there was one on here just recently.Originally Posted by blindsquirrel
The MAP never moves though. And it's 57 Kpa. So the MAP sensor is a 1 bar and it's setup for 2 bar. That's a problem. But the fact it never moves makes it look like it's unplugged. But, combined with the cam signal that never moves, I'd bet it has a 5 volt reference issue. Need to check a diagram for shared 5v ref or shared ground.
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No offense to OP but this is the result of persons being in over their head. Building cars ain't easy. There's a lot wrong with this.
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CMP counts did increment in the runs-on-starter-fluid log.
I?ve done 2 other LS swaps that are now show cars so I was pretty confident in doing this stock Gen 4. All of them have been just stock engines and ECUs with basic tuning since I?m not very experienced in this. Do you think I should download a stock tune and start over on this one?
I have no idea. ECU came with the engine and I turned it on when it was in the donor car. Should I download a stock tune?
How would you put a stock OS back in it if you had one? Can't do it with HP Tuners, not on a Gen 4. Needs GM SPS.
If you don't have any idea what any of that means or why you can't do it, then just buy a used ECM from an ebay seller that offers VIN programming. Search for the Service Number on your ECM label, plus the phrase 'programmed to your VIN'.
Yeah but really weird, it started counting before the engine was even cranking. Some weird shit going on there.
OP you state in your OP the intake manifold is changed. What is it?
Last edited by edcmat-l1; 1 Week Ago at 05:01 AM.
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I don't put a lot of stock in weird offsets between events in the logs, unfortunately. Sure would be nice if it didn't consistently try to fool you.
screenshot.08-05-2024 06.01.20.png
Whether these things are a result of what the modules are putting into the datastream or how the scanner displays the data, I dunno.
Good catch on the empty VE table.
The scanner interpolates between points.. It's not a useful feature IMHO.. if you see the data hiccup you'll see the line displays bridge from one to the other.
Don't forget about my cam wiring hysteria.. lol seen it more than twice now. It acts exactly like this one did.. or vats still on in a hot rod. Like one fire in the engine.. immediate shut down. The first one sat in my shop for a month before we figured it out.
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Guys I think I'm an idiot. I went to look at the stock tune just out of curiosity. When I went to the OS tab, it gave me the option to switch over to 2 bar OS. Looks like I accidentally clicked it probably on the first VATS tune I did on it. I did VATS delete on that tune then flashed it. Low and behold, it fires up and stays running.
It's running lean because of a vacuum leak but there is a P0641 code. 5V reference fault? The pedal does not move the throttle body at all. I'll be doing some electrical diagnostics.
I am a beginner in all this. All I've done is VATS deletes, bank 2 O2 sensor deletes, and DOD deletes on cars. Simple stuff. I hope you can forgive my ignorance, but I am thankful for all your help. I will definitely be learning more and hopefully be as knowledgeable as you guys one day.
Have you ever stated what intake manifold is on it? The map sensor doesn't move. Chances are it's an installation error.
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It's a sheet metal one from Amazon. It has the map port on the back.
First thing I'd do is throw it in the trash and put a stock plastic intake on it.
But, other than that, you should pull the map sensor out and make sure the hole is drilled through.
Short runner sheet metal intakes look cool, but they're horrible, I mean really, really bad at making power.
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