problem need help

[Bad 454ss]

thats what it dose but it ran in that 57

[Chris@LSXPS]

check fuel pressure while firing the truck, see if the fuel pressure maintains as it dies. Also, check the voltage going to the pump and see if the voltage drops at the same time it dies.

[Bad 454ss]

yea i checked that it maintains voltage and pressure i thought it was a fuel problem cuz it was shutting down so i wired it to the ignition.

[Bad 454ss]

alot was tuned out of the pcm but im getting codes for evap anti theft and coolant temp the temp sensor has no wireing in the harness so it wasn't tuned properly

[kha4079]

then you still have anti theft on the computer. eliminate it all and u should be good to go.

[Lextech]

alot was tuned out of the pcm but im getting codes for evap anti theft and coolant temp the temp sensor has no wireing in the harness so it wasn't tuned properly

Make sure you wire in the Coolant Temp Sensor. The PCM must have that input.

Jeff

[Bad 454ss]

dose any one have a pcm pin out for a 97 98 corvette

[Chris@LSXPS]

alot was tuned out of the pcm but im getting codes for evap anti theft and coolant temp the temp sensor has no wireing in the harness so it wasn't tuned properly

you need the temp sensor to be connected and working properly. And im not talking about the sensor your going to use for the guage, im talking about the temp sensor in the head that tells the computer what the temperature is.

[kst3v3n]

This should be easy to nail down.
If this ran in the 57 then it should run in your truck unless :
1. The computer was swapped and its not the one that was running that engine in the 57.
2. There was a stand alone VATS unit that you didn't get. (iirc early models could be bypassed like that)
3. The guy never had the check engine light in the 57 or didn't care about the codes.

Fuel pressure check, a temp hot wire to fuel pump and a noid light will tell you if the Injectors are being shut down by the VATS or just low on pressure.

Since you have a security code, is suspect VATS, and the other codes is suspect a different computer.

This could have happened:
Hey man I just sold my engine out of the 57.
Really, didn't you have a custom tune on that computer?
Sure did, cost me a few hundred bucks too!
How about you swap me this computer and give me the one out if the 57?
Sure, here you go.

Get the picture?

[Bad 454ss]

yea i know the guy that i got it from he is going to look in the car later and see if there is a bypass that he overlooked when he took the motor and harness out. He also didn't build the car his neighbor bought it a while ago and wasn't into the new more complicated ls1 and just went to a carb 383. but there is still the evap code and an anti theft code so obviously it wasn't tuned properly so im just going to get a new tune once i build up the money for it.