New to me 2008 Grand Prix GXP (LS4) with questions

**91parkave** · 12-29-2016

Thats the name of the game with any wbody they alk break something.

**SgtMarshal** · 12-29-2016

I drove it home today, it runs good, drives good, the stereo is sweet, and I like it.

**91parkave** · 12-29-2016

If your on Facebook join ls4 nation. We can help with more tuning advise.

**SgtMarshal** · 12-29-2016

just out of curiosity, is there a way to tell when the afr/dod is starting to fail?

I just requested to join that group.

**Fivefingerdeathpunch** · 12-29-2016

Either the lifters get really loud, start clacking or they just fail and stick.

It's kind of a toss up on when something will happen. It's best to just turn it off or you can leave it on if you have a warranty. Who knows if something went real south you might be a whole new camshaft for free lol.

**16MustangVet** · 12-29-2016

free if under warranty at 89k unless i got extended warranty i highly doubt anything is going to be free.

**SgtMarshal** · 12-29-2016

I kind of wonder if they would put in an LS6 cam and LS7 lifters, at least then the dod/afr problem would be solved, not that there is one now. my concern is that if I turn it off, which would be easy, would the aftermarket programming void the warranty? not knowing, and probably not being able to get a straight answer from the people that do know would cause hesitation for me.

**Fivefingerdeathpunch** · 12-29-2016

Doubtful that they would ever be able to know. They would have to dig deep to ever find out that you tuned it.

Unlike the new 2014+ computers that will show up straight away when a technician plugs in the GM scan tool, it will show a change to the calibration and thus void all power train warranty.