94 TBI 454 egr delete on a 7427 ecm

[X-man]

I am new to factory ecm tuning and have a 94 Chevy dually with a TBI 454 with a 7427 ecm. I get the code 32 for the egr occasionally when driving the truck. It has a modified exhaust system and a couple of leaks. I'm going to put headers and true duals on the truck but want to turn off the egr completely. I bought a Moates Burn 2, HDR1, and a G1 adapter package with 2 27SF512 chips. I read the stock calibration and then went in and change the EGR enable from 255 to 0 and unchecked all the all the egr stuff under flags. My truck only had the linear egr, single pass egr test and code 32 checked. I found a 454 SS 7427 bin and compared everything that was off on this calibration and checked it off on mine. The only other difference was a tps setting under scalers. My truck is a manual transmission and this truck was an auto so I did not try the whole calibration but I did shut off the charcoal canister also. I am using TunerPro and burning this to a blank chip. Problem is when I start the truck the check engine light is on solid and the truck won't idle under 1500 rpm. I put the original chip back in and it does fine. I jumped A and B terminals on the diagnostic connector but when the light is on solid it gives me no codes. This is probably something that has been covered but I did no good under a search.

[Nasty-Z]

I am new to factory ecm tuning and have a 94 Chevy dually with a TBI 454 with a 7427 ecm. I get the code 32 for the egr occasionally when driving the truck. It has a modified exhaust system and a couple of leaks. I'm going to put headers and true duals on the truck but want to turn off the egr completely. I bought a Moates Burn 2, HDR1, and a G1 adapter package with 2 27SF512 chips. I read the stock calibration and then went in and change the EGR enable from 255 to 0 and unchecked all the all the egr stuff under flags. My truck only had the linear egr, single pass egr test and code 32 checked. I found a 454 SS 7427 bin and compared everything that was off on this calibration and checked it off on mine. The only other difference was a tps setting under scalers. My truck is a manual transmission and this truck was an auto so I did not try the whole calibration but I did shut off the charcoal canister also. I am using TunerPro and burning this to a blank chip. Problem is when I start the truck the check engine light is on solid and the truck won't idle under 1500 rpm. I put the original chip back in and it does fine. I jumped A and B terminals on the diagnostic connector but when the light is on solid it gives me no codes. This is probably something that has been covered but I did no good under a search.

Hello,

Since the 454SS never came with the '7427 I can be reasonably sure you tried to use the .bin I posted just the other day .

As is posted that .bin should be a drop in for your application , although it is for a 4L80E you could turn the trans parameters off and run it as is . That .bin is already set up with EGR turned off both in the cal and the SES code .

I would caution you in just taking any .bin (such as mine) and trying to use it , in parts or whole , without a good understanding of what it contains , that .bin has a modified timing table and fuel table as it is on a non stock 454SS that is a now a heavily modded BBC and runs a blower also.

Solid SES light could mean a bad burn to chip or chip is inserted in the adapter backwards .

TOM

[X-man]

Hello,

Since the 454SS never came with the '7427 I can be reasonably sure you tried to use the .bin I posted just the other day .

As is posted that .bin should be a drop in for your application , although it is for a 4L80E you could turn the trans parameters off and run it as is . That .bin is already set up with EGR turned off both in the cal and the SES code .

I would caution you in just taking any .bin (such as mine) and trying to use it , in parts or whole , without a good understanding of what it contains , that .bin has a modified timing table and fuel table as it is on a non stock 454SS that is a now a heavily modded BBC and runs a blower also.

Solid SES light could mean a bad burn to chip or chip is inserted in the adapter backwards .

TOM

Yes Sir I believe that was yours. I did the compare file and went down one by one through the scalers and the flags and matched everything but the tranny stuff. I noticed you left the single pass egr test checked under flags though. I tried it checked and unchecked. When I leave my stock calibration and just match scalers and flags why would my check engine light stay on solid? Even key on engine off will not give me any flash codes. it acts like the valve is opening and staying open as I can put the stock chip back in without the G1 adapter and the truck idles normal. I checked your egr settings under tables and saw nothing different. I even unplugged the egr valve I want to take it off the intake and block it but the light still stayed on. I am using OD_TPV5_v250 xdf to read the files and I am erasing the new chip before reflashing it after each change.

[X-man]

I have been installing the chip in the G1 opposite the way it goes in the Burn 2. I thought that is what it said to do in the video I watched on youtube. This would be with the notch away from the handle on the quick release ZIF socket.

[Nasty-Z]

Yes Sir I believe that was yours. I did the compare file and went down one by one through the scalers and the flags and matched everything but the tranny stuff. I noticed you left the single pass egr test checked under flags though. I tried it checked and unchecked. When I leave my stock calibration and just match scalers and flags why would my check engine light stay on solid? Even key on engine off will not give me any flash codes. it acts like the valve is opening and staying open as I can put the stock chip back in without the G1 adapter and the truck idles normal. I checked your egr settings under tables and saw nothing different. I even unplugged the egr valve I want to take it off the intake and block it but the light still stayed on. I am using OD_TPV5_v250 xdf to read the files and I am erasing the new chip before reflashing it after each change.

You are using the incorrect .xdf to modify that .bin , you need to be using a $OE .xdf to view and modify mine .

What .bin was originally in your truck ? I would be modifying the one you already have , vs trying to make something you found in another post work in your application .

FWIW , the one I made was based on a 7.4/4L80E .bin , you have a 5 speed , there are many IAC settings as well as others that vary from the one you found of mine as it was intended for a 4L80E .

I have a '94 TBI Dually , and I still run the linear EGR , both on the original 454 and now the 502 (509) , I have never had an EGR related code unless there was a reason for it , I would assume there is either carbon build up on the pintle or another restriction there to set a SES light for EGR. It does work pretty well , much better than the old vaccum style ever did. Only reason I turned off the EGR in my 454 SS is the TBI sits on top of a Victor Jr manifold and there is no provision for EGR.

I would simply start modifying the one in your truck . It will be better and easier in the long run.

TOM

[Nasty-Z]

I have been installing the chip in the G1 opposite the way it goes in the Burn 2. I thought that is what it said to do in the video I watched on youtube. This would be with the notch away from the handle on the quick release ZIF socket.

The G1 has a notch on the one end , the notch in the chip needs to line up with this.

TOM

[X-man]

I used the HDR to get the original calibration off my original memcal and saved it to the computer. I then opened it in TunerPro to look at it and the xdf file I got off the TunerPro website was the OD one. I am viewing the qriginal calibration and just burning that after it is modified to a new chip so I don't screw up my original chip.

[Nasty-Z]

I used the HDR to get the original calibration off my original memcal and saved it to the computer. I then opened it in TunerPro to look at it and the xdf file I got off the TunerPro website was the OD one. I am viewing the qriginal calibration and just burning that after it is modified to a new chip so I don't screw up my original chip.

What is the 4 letter code off of the original Memcal in your truck ?

TOM

[X-man]

BHDC 4624 BC ad the ecm# is 16197427

[X-man]

stock bin file from my dually.

[jim_in_dorris]

BHDC is a $0E mask, you are indeed using the incorrect files. her is the moates BCC lock table in excel with your bin circled.

Attachment 8973

[X-man]

I did go back and look at my file again and did the comparison again with the $OE mask. I found a couple of things that were different as far as the scaler settings go. The biggest difference was the IAT setting for afterstart. Mine was 7.8 and his was 23.4 but he said his engine was heavily modded. All the other settings under flags were set the same as when viewed with the OD mask. Thank you for pointing that out though as you can definitely view more things with the OE.

I have erased this new chip and burned it new now three times. The chip says it is burned complete and the truck starts. When I remove the chip and check it what I have changed stays changed so I'm not sure what I'm doing wrong?

[Nasty-Z]

I did go back and look at my file again and did the comparison again with the $OE mask. I found a couple of things that were different as far as the scaler settings go. The biggest difference was the IAT setting for afterstart. Mine was 7.8 and his was 23.4 but he said his engine was heavily modded. All the other settings under flags were set the same as when viewed with the OD mask. Thank you for pointing that out though as you can definitely view more things with the OE.

I have erased this new chip and burned it new now three times. The chip says it is burned complete and the truck starts. When I remove the chip and check it what I have changed stays changed so I'm not sure what I'm doing wrong?

Without being there it is hard to tell where the problem is , I will say there should show a lot more differences than what you say you are finding .

I will say this again though , you have a manual trans truck , start with a manual trans .bin such as the one already in your truck , being a new tuner you will fight an auto trans .bin to get it to be correct with the manual trans vehicle , there are many significant differences between the two.

Did you get the chip to burn and run the truck Without a SES light ?

Got your P/M , will respond later.

TOM

[X-man]

I never did get it to run without the SES light on. I have been using my stock calibration file that I took off the stock chip and saved to my computer. I modify than reflash that to a new chip. I have just been using yours for comparison purposes only.

[Nasty-Z]

stock bin file from my dually.

Something is wrong , either with the way you are reading the stock Memcal or saving the file , something .

I just did a compare with the .bin you provided here and a copy of BHDC that I have , there were a ton of undefined lines as well as address out of range errors .

This would probably explain why the SES light is on with the chip you are burning , any errors on the cal will set the SES light.

I am kind of busy today and this afternoon , but may have some time later tonight to try to help .

I'll P/M you my contact info.

TOM