I have a 4.8l out of a 2003 Chevy express van, that I swapped into my 1999 s10 and it dies after a few second and if I give it any throttle dies out right away. Vats has been disabled using a tuner.
any ideas?

 

Clean the maf sensor if you�re using one, check the IAC (possible just replace it)

 

Definitely sounds like an idle tuning issue. Drive by cable?

 

Yea it�s drive by cable I also did a manual swap so idk if it�s something to do with not seeing the auto trans

 

can you rev it up at all and get it in gear and move the car? or does it just sputter?

 

It starts for about 2 seconds then dies out but if I give it any throttle it dies right away. Cannot keep it running long enough to move it.

 

Check your fuel filter...

 

I replaced the fuel filter.

 

need to do a full flash with a tune that uses a manual transmission. the ECM is looking for parameters that are no longer there since you swapped to a manual transmission

 

You should be able to start and run the engine without any transmission hooked up. recheck the anti theft parameters

 

make sure you do a write entire so your VATS changes will take effect.

 

I�ve wrote the vats deleted file and then reread to make sure it was deleted.

 

it does start, for two seconds, the OP has to disable the DTCs in the ECU.

OP, you either have to disable every DTC for the auto transmission or just re-flash the ECU for a manual set up. I have had this problem before and chased my tail for weeks when i first started LS swapping everything. So a friend came in, 30 mins later, left with the car running.

 

A bad Crank angle sensor will do thesame

 

With HPTuners plugged in at startup, watch your parameters. You’ll figure it out in about 3 tries. You have a sensor…or two…not reporting.

 

Moving to the tuning forum