JSPitman

Hey y'all, I have a 2008 Grand Prix GXP V8, and for the year I've owned her I've noticed on the freeway she tends to release large poofs of white/grey smoke out the exhaust, but only intermittently. She guzzles oil, and the coolant is full, so I'm fairly confident she's just burning oil. After doing some research, it looks like a common issue Grand Prix's of her year have is the displacement on demand system can cause her to guzzle up and burn oil. Now, I've been leaving that system on because gas costs an absolute fortune, so every drop I can save is a worthwhile expense, but I'm also worried that this bad design for a DOD could be causing damage to the engine. Is that the case? As in, I know its normal for engines to burn oil, and typically such wont cause any problems, but will allowing this much oil to get burned on the daily cause any problems in the long run? (She's my daily driver, so I'm on the freeway and seeing this every day). Aka, would it be worth the extra cost in gas to keep from causing more expensive problems later on? Or is there no real risk in letting her burn oil like this? I should note I have a tuner, so it's not a big deal to disable the DOD. Thanks

Hey, thanks both of you for your responses. But its turns out the issue was just me being dumb and not listening to my dad's advice from a day earlier. He had suggested that the fuse's socket may have gotten bent/expanded, so the fuse wasn't making good contact. I brushed that asside as I was certain it was making contact, and thought I'd verified such using a voltmeter. Turns out, my tests were a fluke. He had a look at it hinself after I asked about y'alls suggestions, and he just bent the pin on the fuse a bit and jammed it in there, and now everything works perfect. (Both the compass and cruise control. Still not sure why one breaks the other, but doesn't matter now). I guess while installing the camera fuse, I must've somehow buggered the socket up. Eitherway, thanks again for trying to help, it means a lot to me even if in the end the solution was something else. Moral learned, though- always trust a dad's intuition.

Howdy y'all! I recently purchased a V8 2008 Grand Prix GXP, and after some minor aftermarket changes the cruise control and built in compass no longer work. And even weirder, it's not always broken. Sometimes they will work, but mostly not. Sometimes they'll work for awhile and then turn off mid drive. I don't know what the connection is between the two (compass and cruise control), but when the compass isn't displaying on the HUD, the cruise control doesn't work (at all, turn on or anything), while the inverse is also true. I came here as I am completely at a loss as to what to do, and have tried reverting my changes to no avail. Exactly what I did in order was first I installed a backup camera. The camera needed a 10a fuse thats tied to the ingition, so I shared the 10a Compass fuse slot since I figured the compass doesn't use a lot of power so surely there'd be no problem. After some issues fixing the grounding wire, it seemed to be working flawlessly. And seemed to work fine for several days (both the compass and backup camera). Next, after said several days, I got the car tuned by DiabloSport using a T2. That's when the trouble started. On my way to an Autozone right after, the cruise control stopped working. It was working when I first started the car, but stopped about 5 minutes into the drive (just turned off and wouldn't turn back on). After that, it's been on and off. Sometimes working, sometimes not. I tried reverting to stock programming, but that didn't fix it. Moreover, DiabloSport is certain it couldn't be their tune or tuner since the tune doesn't do anything to the cruise control or anything directly influencing it. I also tried removing the camera's fuse from the 10a slot and put in the original fuse. That didn't work either. My only thought is I fried something in the system or harness, or something somehow came loose. I got no clue where to even look beyond the fuse box. I even replaced the Cruise Control Switch's 2a Fuse and that didn't help either. Any suggestions of what to do next would be extremely appreciated, as this is just not my field of expertise. Thanks