First Tune, LS3/TVS1900 1968 C10

[HartRod]

Here's what I'm working on, 2013 Camaro SS 6.2/6L80 retrofitted into a 68 C10 SWB.

Engine Mods:

DOD/VVT mechanically deleted
3 bolt Competion Cam 269LRRHR (219/235 113LSA)
TVS1900 Magnacharger
2013 Camaro SS MAF
LS9 MAP
Holley Fuel rails
Siemens SD 80 injectors (http://fuelinjectorconnection.com/sh...?productid=285)
A1000 fuel pump with 10AN feed (8AN to rails/8AN return)
Aeromotive Boost referenced fuel pressure regulator (Set to 58 psi).
1 7/8" mid length headers
rear 02s and CATS deleted
A/C

Tranny Mods:

Stock stall
Shriftersix paddle shifters (I eventually want to do a Corvette TCM Tune)
4.11 gears
31" tall tires

My plan:

I'm trying to do a basic "safe" tune to get the truck running so I can have the exhaust put on and make sure all systems are working correctly. Then I plan on taking it to an experienced tuner for a dyno tune.
I tried to do the "simple" stuff first:
DOD delete
VVT delete
Rear 02's and cat delete
change gear ratio and tire size

And then plan on doing this next:
LS9 Map sensor
80LB Siemens injectors
Tune MAF
Set fan temps

Here's my first tune. I haven't flashed anything yet. Check it out and let me know what I missed or messed up, . Thanks,

Rob

[RWTD]

First thing that pops up is concern of those SD 80# injectors and getting them dialed in properly, as there is no proper data on them for GM (Greg Banish's data, while in theory should work, didn't for me, tho there may be some tweaks others have made that help). Get the SD 60s or better yet some ID1000 (if you plan on making more than the 60s will support at 58 psi).

[HartRod]

First thing that pops up is concern of those SD 80# injectors and getting them dialed in properly, as there is no proper data on them for GM (Greg Banish's data, while in theory should work, didn't for me, tho there may be some tweaks others have made that help). Get the SD 60s or better yet some ID1000 (if you plan on making more than the 60s will support at 58 psi).

Thanks for the quick response! I would really like to use the injectors since they are brand new. Thanks again for your help.

[HartRod]

Update to the tune. I got all the injector data correct (I think...). At least it will start and idle. It pushes real hard when you put it in gear....here's the updated tune and logs.

[HartRod]

I fixed the pushing. I had the torque converter brake switch trigger wired incorrectly. It will still idle, but now it dies when you put it in gear. I still don't think I have the injector data done correctly....

[HartRod]

Ok, I've been chasing what I thought was an injector setup/tune problem for a couple of weeks now. I can get the truck to start and idle, but will die when you put it in gear. From the first time I got then engine to start and run, I was getting some misfires on the right side (Bank 2) that were causing the short term and long term bank2 fuel trims to go extremely high. I thought it was just a problem with the injector data I had in the tune for the SD80 injectors I have. From everything I've read online, they are a hard injector to get dialed in. So I just assumed that was what my problem was. After much research and help from the several guys on this board, I'm pretty confident that I have that part of the tune setup correctly, but I still have the problem on the right side.

So last night I decided to do some trouble shooting to try and eliminate as many possible causes as I could. First, I swapped the O2 sensors from side to side, but no change. Next, I swapped the fuel injectors from the passenger side to the drivers side, still, no change. Finally, I swapped the the coil packs from side to side, but still, no change. The only other thing I can think of is that the the wiring to the coil packs on that right side is messed up. The engine sounds like a couple of plug wires are crossed on that side. It's probably been doing that since the first time I fired it up, but its been hard to detect because of the open headers. I even tried unplugging the individual coil packs on that side to see if you could isolate the miss, but it almost seems random. All of the headers pipes on that side are getting hot, so I know everyone of them are firing. This is very frustrating and I've got to figure this out first before I go any further with the tune. Sorry for venting.

Rob

[Kyne]

Have you logged misfires on each cylinder to see if it will tell you which cylinder(s) it is?

[HartRod]

Have you logged misfires on each cylinder to see if it will tell you which cylinder(s) it is?

Kyne - I haven't done that yet. I was just trying to eliminate the easy stuff. How do you log that? Some one else suggested that I do a cylinder balance test. I think I understand how to do that. I plan on doing that when I get home. Thanks for the help.

[Kyne]

Add misfire for each cylinder to the table.

[HartRod]

History or actual?

[Kyne]

Either works

[HartRod]

Here's the scan. Look around 8:20.....Its misfires like crazy on 2/4/8 when I give it the gas. Some on 6, but not much. Nothing NADA on 1/3/5/7. I tried doing a cylinder balance, but it was grayed out and wouldn't let me. Also, I deleted the VVT/AFM and changed the cam sensor, should I do need to do a case relearn? Is there anything int the tune that could cause this? Seems like a wiring issue to me...

[Kyne]

I can't look at your scan right now, you said you swapped o2s, and injectors. Swap everything and see if it moves. Are you sure you have the correct pushrod length? Seems like it's one head that is misfiring. I'm pretty sure at this point you have a mechanical issue.

[HartRod]

I can't look at your scan right now, you said you swapped o2s, and injectors. Swap everything and see if it moves. Are you sure you have the correct pushrod length? Seems like it's one head that is misfiring. I'm pretty sure at this point you have a mechanical issue.

I swapped everything side to side and nothing followed. All of the push matched, 7.4. Why do you think it can't be the wiring?

[Kyne]

I would say because it's narrowed down to one head it isn't the wiring unless that head isn't grounded.

[HartRod]

I would say because it's narrowed down to one head it isn't the wiring unless that head isn't grounded.

There was only one grounding wire in the new Speartech harness. I bolted it to the back of the block. There are no grounding straps to either coil pack. If the coil control connector that connects to the coil pack was miswired or not grounded, wouldn't that cause a problem? Since I changed the crank sensor and cam, do I need to do a case relearn? Why was the cylinder balance grayed out in the scanner?

[Kyne]

Hmm, usually you need to ground both heads. Can you extend the ground to the other head and see if that fixes it? Case relearn maybe but again since it's one head I don't think that's the problem. I assume the ungrounded head is the one that's misfiring. If it was me I would get a ground strap from that ground to the other head to make sure that isn't the problem.

[HartRod]

Hmm, usually you need to ground both heads. Can you extend the ground to the other head and see if that fixes it? Case relearn maybe but again since it's one head I don't think that's the problem. I assume the ungrounded head is the one that's misfiring. If it was me I would get a ground strap from that ground to the other head to make sure that isn't the problem.

Will do.

[HartRod]

Hmm, usually you need to ground both heads. Can you extend the ground to the other head and see if that fixes it? Case relearn maybe but again since it's one head I don't think that's the problem. I assume the ungrounded head is the one that's misfiring. If it was me I would get a ground strap from that ground to the other head to make sure that isn't the problem.

Tried that, nothing changed. I also did a compression check on all 8 cylinders. Everyone of them were 215+ psi. I'm going to do a smoke check, just to eliminate the possibility of a vacuum leak. If that checks good, I guess I will have to dig into the wiring on that side....

[HartRod]

Did a compression check. All 8 cylinders were 220 psi +/-5. I also did a smoke check trying to find a vacuum leak. I didn't see one, but I'm still not ruling that out. I installed a new set of NGK 3346 plugs gapped to 30 thousandths and did a case re-learn. The misfires don't seem to be near as bad now and the STFT's are better. The LTFT on bank 2 is still high. It's also not throwing the lean and rich codes it was throwing earlier. I'm getting the exhaust put on tomorrow and I'll know more about a possible intake leak later this week...Here's a log after the plugs and relearn.