cbxeric

I noticed that whenever I started the truck I heard a squeak coming from the driveline, whenever i accelerated I heard a squeak too, If i blipped the throttle in my driveway it would squeak. so in February Just before my warranty expired I took it to the dealer to get an oil change and I asked them to check it out (as well as the knocking that i've already discussed). So left the truck overnight so it was cold for them to road test the next morning. So no knocking was heard and I was told the squeak was the exhaust flapper valve, A couple of years ago I had the complete exhaust system changed under warranty because of a bad vibration when AFM kicked in, i think the valve was seized. this time around I was told a new exhaust was going to cost me $800 just to have the same issue.. no thanks. I went to Canadian Tire and bought a hose clamp, got under my truck and clamped the valve open. what a difference!! a tiny bit throatier, noticeably better throttler response, and doesn't seem to lose as much speed cruising up the hills. You may not notice this in the V8 trucks but i don't think the V6 likes that valve. I also haven't noticed any extra vibration or noise when the AFM engages. I'm started using 91 octane again to see what happens (wallets lighter) I was averaging 12.3 litres/100km over the last 20k . I also put two bottles of injector cleaner through two tanks of gas. We'll see.

I went from a 2000 sierra 2500 4x4 with the 6.0l engine with 220000 miles on it to a new 2014 Double cab 4x4 SLE v6, I now have 58000 miles on it. My new truck hauls as much and tows as much as my old truck could. I've had 1900 pounds of limestone rock in the box and done many trips to the lumber store. I've averaged 19 mpg and've never felt short of power. I've travelled up the Coquihalla Hwy (see Highway Through Hell) where there's some impressive hills, the temperature gauge rose a little on the big hills with cruise set at 80mph but dropped as soon as I reached the summit and let up on the gas. I love my 4.3, I hate the transmission programming! It must be where I live but the transmission likes to shift into 6th as soon as possible and doesn't like to shift down on the small hills around my place. Possible issues? there's a strange intermittent knock under light acceleration which has me worried, I can also hear some loud ticking in the engine bay when idling, again comes and goes. The noises haven't caused any drivability issues and I've reported it to the dealer who can't find anything wrong. With that being said I would buy another one for sure. The Coquihalla Hwy is no fun in the winter time but it's a great drive in the summer. .

Local GM dealer has been good to me, so long as they recognize the problems and repair it for free, i'm good. We have a fleet of over a hundred diesel Fords (and hundreds non diesel) where I work. lots of down time to repair..over and over again. They are the cheaper truck to buy for a fleet, but cost more in the long run. Dealer cannot fix the 6.7 properly and they usually blow up again, took them three tries to fix one F450, they're too complex and the old experienced techs have retired. We are now trying out the Ram 5500 cummins. Unfortunately GM doesn't sell a truck that suits our needs. I can get an amazing deal on an F150 (fleet pricing)... I still wont do it. Sorry a little off topic. Fix my radiator GM, keep me happy. hopefully the problems taper off. I do like the truck.

2014 SLE double cab V6, I notice my coolant was low in the header tank, since I'm beyond the bumper to bumper warranty, I went to the dealership to grab a jug of coolant to top it up. The parts dept steered me to the service department who informed me that the V6 trucks are now included in the extended warranty. they were very helpful and it took about 10 min of searching to find the leak (top corner of rad passenger side front). I didn't really notice anything other than the odd puff of steam in the winter time. I thought it was snow stuck in the radiator. If your coolant header tank level is low, there's a very good chance that the rad is leaking. Another clue for me was I noticed the coolant temperature gauge had been reading hotter than usual. Cheers.

I'm over 300,000km now plus I've got 6800 hours on the engine.

282000 km, still like new. It knocks a little (or a lot) till warm and uses no oil. A little maintnenance goes a long way. and yes I am suffering from the cold start blues.