1995 c1500 with 7427 ECU newbie help

[sank]

Hello,

I'm new at this and willing to learn, trying to figure out how to use this tuner pro. I'll start out with what I working on, I have a 1995 chevy C1500, the truck started out as a 4.3 with a 4L60E. then at some point it got converted to a 350 and it ran fine with a new chip. After several years the 350 gained a crack in the lifter galley and the block was junk. We put a running .030 over 454 that came out of another truck. We put a TBI adapter on the intake and put a 7.4 TBI body on. It ran great when it had a HEI and Carb. Now we can't get this motor to run with the TBI. It will start and rev up but it back fires a lot and will not idle at all. The motor does have a mild cam in it but nothing extreme. My buddy put all new sensors on it and we got all the codes cleared off so there no issue. I assume our main problem is with the cam being the vacuum isn't the same as a stock cam. I measured 14-15 hg of vacuum and good fuel pressue.

Now here we go with the tuner pro side of the story. I brought a APU1 from Moates and a G1 chip adapter, the computer in the truck is a 7427. I finally got around to installing everything today and unsure if I did everything right. I followed the stickeys the best I could to set it up but seems like I wasn't getting anywhere and getting more confused. I have the tuner pro RT. I down loaded both 1993_Chevy_7.4L_Stage_1.bin and (http://www.gearhead-efi.com/Fuel-Injection/attachment.php?attachmentid=695&d=1323147745)BJYL 350 TBI 700r4.zip
(http://www.gearhead-efi.com/Fuel-Injection/attachment.php?attachmentid=724&d=1323147804) bins. I tried the 7.4 being it was the only 7.4 file I saw, and the BYJL being that was was the chip that it had in it. then I installed Advanced $0D TP5 v251.xdf (http://www.gearhead-efi.com/Fuel-Injection/attachment.php?attachmentid=3947&d=1361028399) and the A218 Trans2 $0D TP5 v250.adx (http://www.gearhead-efi.com/Fuel-Injection/attachment.php?attachmentid=3946&d=1361028399) files, and uploaded all 3 into tuner pro like the newbie page told me. Then I took my lap top out to the truck and plugged everything in to the apu1 (computer to apu1, apu1 into OB1 port, and also apu1 into the G1 on the ECU) I believe I had everything set up right, the tuner pro found the aup1 in com 3. I was trying to run the truck off the tuner pro but it wouldn't start so I'm not sure where I went wrong. Did I download the wrong files? I assume that it's user error on my part. Also as I looked into the files, there so much in there, and I'm not sure where to start on adjusting timing and the map sensor. Is there any pages that someone could direct me to to help me understand what files I need to fix and what files I need to stay out of? I was looking at youtube and other sites and their stuff looks different than what I was looking at. Which I would assume it the differences in the Bin.

Thanks
Jim
(http://www.gearhead-efi.com/Fuel-Injection/attachment.php?attachmentid=724&d=1323147804)

[jim_in_dorris]

Use $0E for a 454. The $0D code is for a 350, not much would work right. Spark and fuel way different. Also, your 4l60e won't last very long behind a 454, so be prepared to change that.

EDIT... I did find a $0D 454 bin, but given that the 4l60e won't last I would go straight to $0E and an appropriate bin in your apu to start.

[myburb]

I might not be reading you correctly but data logging has obd1 port to apu to computer. Eulating has computer to apu to ecm. Also switches in back of apu depending on what you are doing. Moates has a pic direction on their site.

[sank]

Thanks, I'll check into that more. this isn't my truck, My buddy that I'm helping said this trans is built up and stuff done to it, we will see what he ends up doing. I'm just trying to get it to run for him.

Maybe I misunderstood the directions somewhere I'll check into that, I had both hooked up. Thanks

[jim_in_dorris]

You are also using the wrong adx, that is for transmission definitions. Use a217 definition for tuning

[sank]

Thanks for letting me know that, I really appreciate it.

[myburb]

Although you can wreck both motors and transmission with bad tunes it is way easier to wreck a trans and not see it coming than a motor. If I were fooling with your system I would use the tune that ran well with the 4l60e as a starter. Then find a $OE 7.4 tune from a motor similar to what you now have and transpose the engine parameters to your original 350/4l60 chip and that should get you started so you can do some data logging and and be as kind as possible to your 4l60e. As pointed out if you wail on the 454 the 60e will not like it.

[sank]

that sounds like a really good idea, I told him he would need a trans change but it his truck. He does all my body work/ paint work on my cars and truck so we bartered a deal where he would do body work if I get his truck going with the TBI. Not only I'm doing this for him, I'm also trying to get my feet wet when I do a LS conversion on a 1955 chevy pick up so this will help me understand better. I used to work at a Carb shop called APD so I have a general understanding on motors but don't know much with EFI thanks for the suggestion, that sounds like a good way to go until he nukes it

[myburb]

One other thing you might not be aware of is there are two different 454 tbi setups. One is dsigned for 12-13 fuel pressure and one for 28-30 fuel pressure.

[sank]

I think this has the 30psi system being it's a 1995.

so If I'm reading this correct I would need a $OE 7.4 Bin, with a A217 $0D TP5 v250.adx (http://www.gearhead-efi.com/Fuel-Injection/attachment.php?attachmentid=3944&d=1361028399) and Advanced $0D TP5 v251.xdf (http://www.gearhead-efi.com/Fuel-Injection/attachment.php?attachmentid=3947&d=1361028399) files from the 7427 $0D section on this site? I'm currently trying to upload the files from the current chip but I'm still working on figuring how to view it. once I get past this learning curve it should get easier

[sank]

nevermind, I was able to save the bin from the chip and used the a217 adx file and the xdf file above and now I can see data, at least I hope i did it right

[myburb]

I don't know about the 4.3 trucks but trucks that came with a 350 had low pressure pumps (12-13) and only if it came with a 7.4 would it have the high pressure pump and being as it is a 1500 which never came with a 7.4 in 95 I would say it has the low pressure pump. You can either install a higher pump or find 7.4 injector from a pre 94. You need OD adx to read and change your chip. You need OE to read a 7.4 bin to find the numbers such as spark, ve and settings. It is possible the OD would read the OE engine paramaters-- don't know but the other way would be the safest.

[sank]

Oh ok, yea I see what you're saying now, I was able to check the pressure today and put a adjustable reg on it, after adjusting it I got 18psi of pressure, so that makes sense now being it was a 4.3/5.7 truck, I talked to my buddy and he thought he put a 2500 pump in it but maybe he brought a 5.7 low pressure pump, we will change it out. I would think it would still idle at 18psi, just be lean on the top end until we get it fixed with the right pump.

I also starting to understand the tuner pro better now with what you posted, I gotta download the OD adx and xdf files to read the 5.7 bin that came with the truck, then I also need to download the OE files for a 6395 ECM for the 7.4 bin, adx and xdf files so I can read the 7.4 bin, then I can compare the engine data and make the changes I need to make.

Thanks for the help, I don't want to become that annoying guy that keep asking stuff. I been reading several topics trying to learn this. I just printed off eaglemark programming 101 post to help me do any changes

[myburb]

Just to keep the curves coming, if you elect to keep the low pressure system and get some pre 94 injectors they will have from something earlier which might be for instance 7060 which used a $85 adx. You would need that to read the injector flow to put into your OD bn.

[sank]

oh there a possibility, I'll have to see what he wants to do, this stuff is starting to make sense now,

Do you know of a form on here or a site I can reference, that list what tables we use to do the adjusting and what tables we leave alone? Looking at the bin I see there several tables under spark advance, I wasn't sure if I should take the time to change all the tables so that they are the same as the 7.4 or if I only need to change certain ones and the other tables will update automatically. I hope that doesn't sound like a stupid question to ask. Being there are 396 treads on here, I didn't know if I overlooked a important tread, the programming 101 is the only one I printed off so far, but I'm still looking through treads when I get time away from the Railroad.

Thanks

[myburb]

Now that you have established that it has the low pressure pump, what exactly is the tbi/injector. With that info it might be possible to get it runnng by spoofing the chip you have now.

[sank]

I should had looked when I had it apart putting that regulator in, I'll take it apart tomorrow as long I'm not working and check to see what they are. I know it a 7.4 body and the IAC been rewired from the square plug to the flat plug and I doubled checked his work to make sure that he wired it correctly. Which is was according to the other forms I looked at. He told me that everything he brought was for a 1995 2500, sensor, plugs, pump, injectors, ect. But being we know now that the pump isn't the high pressure pump that should be for a 2500 7.4, I wonder what injectors he put in it.

[myburb]

I am going to go out on a limb here but while you have it apart tomorrow put in the 55 lb injector from the 350 tbi , run the 18 psi fuel and with nothing else I have a hunch it will run. I am not saying drive it that way but I think it will run.

[sank]

Alright, the old tbi is long gone but I can run to auto zone and get injectors for the 350 and put them in, I'll do that in a bit, and report back to see what happens

[myburb]

I only suggested it if you had the old ones. I wouldn't spend money on them. If you are going to spend money it would be better to get what you really need. First thing would be to find out exactly what injectors you have.

[sank]

I just came back from the garage, had it apart and looked, only numbers I found were on top and one side had RIN-564 and the other side had 6083. I'm thinking these are from autozone under the GP sorensen brand

[myburb]

I did a quick search and those are the 94-95 high pressure injectors. So I think your choices are upgrade the pump to higher pressure and use the injectors you have or leave the pump and get injectors from a 92-93 7.4. That should make it run and allow you to start tuning.

[sank]

thanks for the info, I was looking also. thanks for the help with trying to get me on the right course.

[sank]

latest update, I finally figured out how to get the truck to run off the computer. got it fired up and running. I was using the $0D Adx file and xdf files from here and using the bin I uploaded from the 350 chip that was in the truck. Still had a horrible popping and back firing issure. So I came in the house and copied all the spark tables from the $0E 7.4 to to the bin I had uploaded so I could keep the 4l60e trans info. Hooked up the computer to the truck again and tried running it again, still popped and back fired. tried messing with the Dist to see if it was a timing issue and it wasn't. Decided to change the plugs to see if that made a difference, I was told they were brand new plugs when I took over the project, but they came out black and fouled looking. put a different set in and it ran pretty good off the computer. I was impressed. Took it up the drive and back and it seems like the trans is in limp mode, only had 2nd and third gear. I put the 350 chip back in and I had all gears but I could tell that it wasn't happy with the 350 chip. I talked to my buddy, he gonna get the high pressure pump to put in the tank so I can really start tuning. One thing I did notice, it wanted to idle at 1500 rpms I'm sure that a something in the timing table that I gotta adjust. I didn't see a idle speed setting. Plus I'm gonna order a WBO2 sensor to help tune this truck in also. only other question I had was can you read live data with tuner pro rt with a OBD1 system on these trucks? I tried getting it to work but it wouldn't connect. I read the Moates directions also and still no go.

thanks for all the help, this is starting to get easier and easier.

[sank]

Well I thought I was running off the computer. I accidentally closed tuner pro while the truck was running and the truck still ran. I have a G1 adapter that I'm using with my apu1 to connect to the computer. I also had the 350 chip plugged into the other port on the G1. So I'm thinking it was running off the other side of the 350 chip if that makes any sense

[myburb]

Glad you got it running. Popping is probably just lean from the mismatch of pump and injector. The new pump should make things settle down. Yes you can data log and see real time in dash board mode. You can also customze dash board to display anything in the data stream and there is lots of them. Is the 454 stock or warmed up. Once you get it runnng decently I might be able to send you some settings to look over. I have two 454 runnng on the 94-95 30 psi system and one on the 12 psi system. They run so well I hardly ever fool with them now.

[sank]

the 454 is .030 over with flat top pistons, cast iron heads ported with the intake, and it has a comp extreme cam that isn't much bigger than the computer cams they sell.
here the link for the cam. https://www.summitracing.com/parts/cca-cl11-242-3