Ls1 to ls6 swap

[Buddy Rooks]

Drove to town car shifted really fast (460le) . Wouldn't down shift to power go go mode. Gave tps so I changed that , starts up idles fine. Punch it and it turns them over, start driving normal runs great then dies . starts dies immediately wait 20 minutes runs normal . repeat lol please anyone

[Buddy Rooks]

Could it be the map sensor ?

[pajeff02]

Any codes popping up? You have something odd going on as it sounds like "limp mode" is engaging.

[Buddy Rooks]

Just the oxygen rear oxygen sensor. It just straight dies and will fire up and die . If you I keep trying to start it stumbles and dies. New tps . Can I find anything out with my superchips tuner ?

[pajeff02]

Fuel pressure is the first thing to check. You should have 58 psi at the rail. If your fuel pressure is good, take a look at your fuses to see if anything has popped off - start with the ENG SENS fuse in the underhood electrical panel.

[SMWS6TA]

If you installed a new tps you need to perform a ecm relearn for it.


Key off
Disconnect TPS
Turn key on, no start, for 10-15 seconds
Turn key off
Connect TPS
Turn key on, no start
Open throttle body all the way open (100%) and close once or twice.
Turn key off
Turn key on, START

This should reset the sensor for the ECM.


I'm with Jeff though on this one, after the reset check fuel pressure.