4.8 LS swap into 1988 c4 corvette

[Corvette Chris 39]

i have swapped a 4.8 into my 1988 corvette an i have done the following things to it
1. sheet metal intake because of hood clearance
2. stage 4 btr cam [email protected] INT:224 EXH 230, Valve lift .553 INT .553 EXH Lobe sep 109
3. I get it to start but dies after 3-5 secounds after running
4 . ive got the right fuel pressure 58lbs
5. i have tbss injectors 30lbs because thats what i had
6 . my vats are turned off
&. stand alone harness
i think that might be it
heres my tune

[ns158sl]

Did you write entire after you turned VATS off? Post a log.

[5FDP]

It would benefit you to put in the correct injector data, just saying. Will need more base running airflow too.

Still running a MAF or going speed density?

[Corvette Chris 39]

[QUOTE=5FDP;773754]It would benefit you to put in the correct injector data, just saying. Will need more base running airflow too.

Still running a MAF or going speed density


im not sure what im doing sir. its all new to me

[Corvette Chris 39]

Did you write entire after you turned VATS off? Post a log.

im not sure on how to post a log sir . im still trying to learn how to post on here but i think im getting the hang of it

[Corvette Chris 39]

how do i post a log sir

[Corvette Chris 39]

ive tried adjusting them but cant seem to figure it out

[Corvette Chris 39]

It would benefit you to put in the correct injector data, just saying. Will need more base running airflow too.

Still running a MAF or going speed density?

what is speed density

[kevin87turbot]

If you disable the MAF, it will force it to SD mode. That forces the engine to run on the VE table instead of the MAF and VE.

You can unplug the MAF and force it to SD.

Have you had your injectors flowed?

[Corvette Chris 39]

i hvanet had them flowed sir .

[Corvette Chris 39]

If you disable the MAF, it will force it to SD mode. That forces the engine to run on the VE table instead of the MAF and VE.

You can unplug the MAF and force it to SD.

Have you had your injectors flowed?

3rd - Custom 1 Bar OS hanes tune.hpt

[gtstorey]

You need to either spend a couple of months reading on here, watching you tube, and maybe pick up some of Greg Bannish’s books or hire a tuner to get this going. It’s going to be very hard starting at the very beginning and explaining everything via a question/answer back and forth.

[edcmat-l1]

OK, lots going on here.

First, you need to know whether it's setting the P0103 code. A lot of GEN3 PCMs have a tough time setting the code right after a flash or battery reset. When they do this they start and stall just like a VATS problem.

Second thing, zeroing the MAF table makes this worse when the problem is present. Sometimes restoring the MAF table allows them to run long enough to set the code.

Third, without know what injectors are in it, it's impossible to know if the data is correct which then leads to not knowing if the rest of the math is incorrect.

Flash this file in and then when you attempt to start it, check your codes with your scanner. If P0103 isn't present it won't run. Sometimes you have to crank it multiple times for it to set, then it'll take off and run normal.



3rd - Custom 1 Bar OS hanes tune_EH1.hpt

[Corvette Chris 39]

The injectors are out of a TBSS intake 6 LITER the part number is12580681 for the injectors

[Corvette Chris 39]

OK, lots going on here.
They are EV6 injectors part# 12580681
First, you need to know whether it's setting the P0103 code. A lot of GEN3 PCMs have a tough time setting the code right after a flash or battery reset. When they do this they start and stall just like a VATS problem.

Second thing, zeroing the MAF table makes this worse when the problem is present. Sometimes restoring the MAF table allows them to run long enough to set the code.

Third, without know what injectors are in it, it's impossible to know if the data is correct which then leads to not knowing if the rest of the math is incorrect.

Flash this file in and then when you attempt to start it, check your codes with your scanner. If P0103 isn't present it won't run. Sometimes you have to crank it multiple times for it to set, then it'll take off and run normal.



3rd - Custom 1 Bar OS hanes tune_EH1.hpt

[Corvette Chris 39]

so i am getting the p0103 code and im also getting a p0342 code as well .

[gtstorey]

P0342 is a cam sensor code. I don't know that it would set that code, but you did match up the reluctor tooth count to the ecm?

[Corvette Chris 39]

first log.Layout.xml i think this is it

[gtstorey]

first log.Layout.xml i think this is it

If you are trying to post a log, it should have a hpl extension. And they are auto saved even if you didn't save them when closing a scan.

[Corvette Chris 39]

P0342 is a cam sensor code. I don't know that it would set that code, but you did match up the reluctor tooth count to the ecm?

mine is a 24 tooth but i dont know how to go bout checking the ecm