well........tonight I put the LS2 silver blade on and still having the same issues. Now the car will actually stay running even with the reduced engine power but like crap. Still throwing the same code as well. I left the battery unhooked so it would clear itself but the car still did the same thing. I sent another email to the tuner and waiting for a response. I checked the wiring and pins, which everything looks good. I thinking its pretty much out of my hands at this point and take it to someone that can tune the car to run.

 

Question. Are you still getting the exact same codes now? Also, do you have the MAF sensor hooked up? Or are you just starting the car up with the TB open (no air filter, MAF, etc)? It really sounds to me like the MAF is not functioning correctly. The computer is expecting a predetermined air flow rate and it's not seeing it, thus going into RPM. My car does this occasionally and I just clear my codes (I have an intermittant TPS code which I think is/was caused by the boost of the supercharger). When in RPM (aka REP) mine also idles terrible. As soon as I clear the TPS code, it idles normal again. Def need either a MAF replaced or cleaned or have some tuning done. On the bright side, you're making some progress.

 

I have everything hooked up when running the car. I’ve been playing around seeing what it does and I think it’s just a tuning issue at this point.

I tried the ls2 TB and the car start unless I give it just a little throttle. Soon as I touch the throttle it throws the 1514 code.

The ls3 TB throws the code soon as it starts but will run without me touching the throttle. If I hold it full throttle it runs to 2k RPM and stops.

the 102 TB just runs horrible all together and car doesn’t like it at all. If I clear the code while the car is running, it act like it wants rev really bad on its own until RPM kicks in saving it from revving high.

I tried changing the pins like HPS said but I don’t notice a change in anything and hear the TB’s opening closing before I start the car on all three. The TB’s seem to be working fine “opening and closing” until the car is started. No codes are thrown until I start the car.

As as of now I left the ls3 TB on bc I think I’ll atleast be able to drive it on a trailer with that and off to a tuner I go. I know I’m close to getting it right but I’ve just lost all patience after building the car for over a year and half. You spend thousands of dollars and when stuff doesn’t work right shops stop answering there phones that sold you the go fast stuff. I appreciate the help on here bc this forum is the only place I’ve ever had clear answer. I’ll keep the post updated once I get it right.

 

i found my old pictures when i was testing. is this how you have it wired?

 

You definitely have had some issues going on. Since the engine change, I am wondering if the tuner didn't make any changes to the 1514 table in the tune. If they didn't that could possibly be the issue. With a built 416 they would have to up the parameters in that table or the 1514 code would set putting you in RPM due to the increased airflow over a stock 350. The PCM would think too much airflow is coming into the engine for the set Throttle angle and set the code. Upping the parameters in the table would fix the problem. So possibly a tune issue going on. GL

 

The tuner emailed me back saying the 1514 code would more than likely be a wiring issues since I’ve tried the different TB’s and getting the same code. He said he could make a couple of adjustments for me but I need to run down the wiring.

At at this point I’m gonna pull the pcm back out tomorrow and ship it again. While it’s gone I’m gonna check the obvious signs of wiring issues and check what HPS provided. Hopefully get it figured out over the next couple weeks.

 

Any updates on this yet? Sure hope you get it going. Shame that the tuner isn't close by.

 

At this point it will be a week or so before it’s figured out. I got the PCM back out and shipping it today. While the PCM is gone im changing to a ls3/7 style maf as well. Tuner is gonna make some changes and update for the maf change. By the time the PCM is shipped back, it will probably be a week or longer.

I’ll update as things change, thanks.

 

PCM has been installed again tonight and here we are again...it only throws the 1514 code now but still goes into REP. My tuner switched the car to speed density for now so I dont have MAF issues. I spoke with him over the phone and he told to run diagnostic tool to see what the TB is doing. He thinks I have a wiring issue or bad ls2TB. I just purchased the TB on the forum and I was having the same issue when I had my NW 102 TB on the car..so I dont think its the TB. I checked the caspers wiring harness tonight and it seems to be pinned correctly. Im gonna try a scan tool this weekend and if I cant chase anything else down then Im gonna haul the car to the tuner.

I was reading about the 1514 code further tonight....could I have a bad tac module??or would it throw a different code. I'm just ready to do it for Dale and switch over to holley wiring harness this winter since its already getting cold here in Indiana....this is crazy...

 

Check EACH pin in the adapter harness. Especially the female pins. Check the adapter harness for proper continuity while you bend and twist the harness.

Check the OEM connector female pins and make sure they are not spread apart.

What year TAC module do you have? If you watch the throttle blade while some one presses the accelerator, does it follow properly and is there proper TORQUE on the blade when its commanded to the position.

Check the TAC Module FUSE. Actually measure the voltage at the fuse on the two test points on TOP of the fuse to a good chassis ground. Check the voltages when the throttle id being manipulated full range.

If the voltage isn't FULL BATTERY VOLTAGE, that could be an issue. I pretty sure its ignition switch supplied..

BC

Bill

 

Got one more idea for ya as well. Do you have or know someone with a similar vehicle as yours? The TAC is very simple to R&R and maybe you could temporarily borrow one and see if that resolves the issue. I tend to think Bill might be on the right track. A bad pin or connection on the TAC could easily cause the error as well. I also don't necessarily agree with your tuner in your post #27. The increased air flow could easily cause this issue if it was not addressed in the tune. Sure hope you get this resolved soon.

 

Thanks guys, I’m gonna go through the wiring this weekend and try hooking up a scan tool.

When the codes are cleared you can hear the TB working with the gas peddle until you start the car.

 

CV.MOV


this is the car at idle last night in REP. Seems normal just throttle does nothing once started. I would also say it isn't a vacuum leak if its running fine like this right?

 

video was taken with Iphone, I don't think it will work on here.

 

Video works just fine TU.

 

Today I went through everything and had friend/mechanic bring his nice diagnostics tool over as well. Everything wiring wise with the car checked fine. The diagnostics scanner shows the TB working correctly and having the right volts. The scanner shows TB reaching 16% throttle and the car starts fuel/spark cutting. With the CA intake off and the car running, you can see the blade open to 100% throttle but the car doesn't rev up. The scanner also shows the TB opening at 100%.

The scanner says air calculation is too high for calculated something...don's remember exact wording. At this point I'm pretty confident with the tune and just plan on hauling the car to the tuner to make adjustments...will see where it goes from there. I just don't see what else could be causing the issues...

 

"The scanner says air calculation is too high for calculated something" is exactly what's causing the problem and throwing you into Reduced Power. That is in the tune. See Bill Curlee's posts #8 and #9 and my post #23 where we both said this. There is an expected air flow rate that is not being met (it's probably more than the computer expects) and its putting the engine into RPM. Your tuner needs to address this.

 

Your TUNER is SCREWING YOU! Simple as that! If he doesnt adjust that table, you are NEVER going to drive your car..

Why the hell is it difficult to adjust a single table???

YES,,, the engine will IDLE just fine. It will NOT allow you to use the THROTTLE to inrease engine speed because GM designed in SAFE GUARDS so the engine will not run away (throttle wise).

If the Throttle By Wire calcuations are not with in GM predetermined SPECS, you just have a nice lawn orniment.

Bill

 

The car finally runs! I hauled the car 3hrs yesterday and another tune was put in the car by the same guy. At first it wasn’t going to work and two injectors were not firing with no power.

After sometime, the pcm was erased and started with new. After that the injectors started getting power and the car ran great. Tuner said it was a corrupt file in the tune. Didn’t have the best experience and when it comes time for dyno I’ll go else where, just felt the guy needed to finish what he started. Thanks for all the input on here and maybe this thread will help someone else down the road. Cleaned the car last night. Have a long ways to go still.

 

Glad its back on the road! Good job getting the tuner to do his part.

Bill