SLMxHD

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?

jasons69chevelle

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

theunderlord

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

SLMxHD

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

theunderlord

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

SLMxHD

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.

G Atsma

Check your fuel filter...

SLMxHD

I replaced the fuel filter.

AJT_LBA

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

jetech

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

LilJayV10

iTrader: (39)

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

SLMxHD

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

AJT_LBA

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.

Mickyinks

A bad Crank angle sensor will do thesame

Che70velle

iTrader: (6)

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.

Darth_V8r

iTrader: (4)

Moving to the tuning forum