Cos3 01270003 to Cos 5 02020005. Wont start now

[SuperStepside]

Hey guys. Full story is I have a 95 silverado with a DBC 6.0/4L80E. Motor came with an 0411 pcm that had the 12208322 OS. I switched that to the 01270003 cos 3 since Im also running a turbo. It runs fine like this but now I want to upgrade to the cos5. So I went to tune file depot and got a stock file from a 2002 chevy silverado with the 6.0/4L80E which has the 12212156 OS. So I did the full flash to the 02020005 OS, cal flash the 12212156, read, and saved. Then I copied and pasted my co3 tables to my cos 5 tables and cal flashed that to the computer. Went to start it and it cranked but didnt fire. It would pop every now and then. So I full flashed the cos 3 back into it and it started slowly and runs now. I think it was flooding. So what did I do wrong here? Or is it I cant use the 2002 silverado tune file?

[joecar]

Did you copy your injector tables also (specifically B4001 IFR)...?

Does your vehicle run with the stock 12212156 file...?

[SuperStepside]

Yea those tables are the same between cos3 and 5.

Unfortunately i didnt run it on the 12212156 file first. Ill have to make another file and copy/paste all the tables again.

[SuperStepside]

Alright well I made another 12212156 file with cos3 tables and it runs. Then I full flashed the cos5 back in and now it starts and dies. Only runs for a sec. Wideband says 14.7-15.0 when it is running for that second. Seems a little lean at startup since its 64*F outside right now.

Heres the cos5 file 19170

Also heres the cos3 file. Maybe I missed something between the 2? 19171

[joecar]

I'm looking thru your 2 files to see if something jumps out...

If it ran on 12212156, it should run when you upgrade this to 02020005... did you read back and fix B3647 (it looks like you did)...?

[joecar]

Sounds like VATS is kicking in...

[SuperStepside]

B3647 is the same between cos3 and 5. I guess I can try full flashing a new 02020005 file and then cal flash the 12212156 back in and see what happens.

My truck doesnt have VATS since its a 95, that started in 96 for the silverado. Also the anti theft is turned off in the tune.

[SuperStepside]

Still no dice with new 0202005 file. Gonna just leave it in cos3 for now.

[joecar]

yeah, sorry, I can't see the reason for not running on 02020005, strange.

[69camaro5speed]

superstepside did you get this fixed if not I may have your fix ?
I have seen this before, its a easy fix

[SuperStepside]

superstepside did you get this fixed if not I may have your fix ?
I have seen this before, its a easy fix

No I never did, just stuck with the COS3.

[MurderMitten]

SuperStepside: Was curious as to what the potential fix to this was. Was gonna look at doing the exact same thing but not if there's going to be a "not sure" problem with going to cos5.

[69camaro5speed]

No I never did, just stuck with the COS3.

Try this adjustments to see if it starts this should help.
Guessing you have a 2 bar map sensor If not you need to change your scale
also guessing your injector info is correct

do a full flash and see how it does

I have has some where it does not fault the maf meter right away and they will act like that.

Your setting on MAF Diagnostics could of made it take a while to kick it to sd.

If you have no maf on the car it will some times not start because its reading the first line of the maf and does not give you enough fuel to start.

so if you bring up the bottom area of the maf some it gives you more fuel for starting so it can run enough to fault maf and run

I Have seen this many times even with maf setting to 1 some times they will not start ....

[69camaro5speed]

SuperStepside: Was curious as to what the potential fix to this was. Was gonna look at doing the exact same thing but not if there's going to be a "not sure" problem with going to cos5.

Murdermitten co 5 works great I have used it 1xx times na ,boosted and nos cars It rocks

[SuperStepside]

Try this adjustments to see if it starts this should help.
Guessing you have a 2 bar map sensor If not you need to change your scale
also guessing your injector info is correct

do a full flash and see how it does

I have has some where it does not fault the maf meter right away and they will act like that.

Your setting on MAF Diagnostics could of made it take a while to kick it to sd.

If you have no maf on the car it will some times not start because its reading the first line of the maf and does not give you enough fuel to start.

so if you bring up the bottom area of the maf some it gives you more fuel for starting so it can run enough to fault maf and run

I Have seen this many times even with maf setting to 1 some times they will not start ....

Still havent gotten around to trying cos 5 again. Yea I made sure that the tables were the same between the cos3 and 5. Running speed density. Ill have to try this when I get the chance. Thanks for the help.

[joecar]

...

If you have no maf on the car it will some times not start because its reading the first line of the maf and does not give you enough fuel to start.

so if you bring up the bottom area of the maf some it gives you more fuel for starting so it can run enough to fault maf and run

I Have seen this many times even with maf setting to 1 some times they will not start ....That's a good trick to know :cheers:

[Highlander]

That's a good trick to know :cheers:

This is because it is not setting up the code for the Mass Air. All these cars crank in SD. If your P010x doesn't set quick enough this will happen.

[joecar]

Yes, without a MAF DTC the ECM reads the MAF, so bringing up the MAF low cells gives you more fuel to allow starting.

[69camaro5speed]

Yes, without a MAF DTC the ECM reads the MAF, so bringing up the MAF low cells gives you more fuel to allow starting.

That is what I seen on the 03 04 stuff a lot i have done a lot of off road buggys where they shut the master power off all the time so this help when dfc gets reset every time other wise you some times (depending on couple things) will pull your hair out working on them

[joecar]

MAF related thread: Cos5-help-after-loading-tune-car-wont-start-without-maf-plugged-in (https://forum.efilive.com/showthread.php?27808-Cos5-help-after-loading-tune-car-wont-start-without-maf-plugged-in&p=240897#post240897)