What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[iamdub]

ya I have added cleaner on full or empty tank, they probably just say "full tank" on the product that so people won't complain if it made the engine run goofy for some god forsaken reason

People usually are using additives BECAUSE the engine is running goofy. But, you know people are gonna ***** no matter what.

 

[iamdub]

If you are flex fuel and have it available nearby, run a tank of E85. That'll clean the injectors, valves, and combustion chambers

Good point! I always forget about this.

 

[Doubeleive]

I only have a 92 oct tune from BB so not sure how it would react to some e85

 

[Geotrash]

I only have a 92 oct tune from BB so not sure how it would react to some e85

I do as well and it ran great in my 2012.

 

[Sparksalot]

I only have a 92 oct tune from BB so not sure how it would react to some e85

Waitaminutehere, that’s supposed to be uber fuel!!

 

[gooffeyguy]

I only have a 92 oct tune from BB so not sure how it would react to some e85

From what I understand, the E85 tables (spark/fuel) are seperate from the regular fuel tables. Many tuners don't mess with the E85 tables.

I run the 93 (or 92/91 whatever it is) octane Diablo tune and run E85 when not running 93

The thing I'm not sure is at what Ethanol percentage the ECM switches tune tables. @swathdiver

 

[iamdub]

I only have a 92 oct tune from BB so not sure how it would react to some e85

If yours is FlexFuel, it'll still adjust for it. How accurately is the question. The virtual sensor seems to be so hit-or-miss. At 65% alcohol content, the most mine would read was 22%-23%. In addition to the MPG hit, it's a waste when running it for power and cost savings if it doesn't fully adjust for it. The fuel will still have its cleaning properties, though.

Actually, I think my testing took place way back before I did the engine work, which included new upstream O2 sensors. Now that my tank is really low, I might try half a tank of E85 and repeat my testing. But now I'm trying to determine when I actually tested it cuz if I remember it at all, it couldn't have been that long ago.

 

[Doubeleive]

If yours is FlexFuel, it'll still adjust for it. How accurately is the question. The virtual sensor seems to be so hit-or-miss. At 65% alcohol content, the most mine would read was 22%-23%. In addition to the MPG hit, it's a waste when running it for power and cost savings if it doesn't fully adjust for it. The fuel will still have its cleaning properties, though.

Actually, I think my testing took place way back before I did the engine work, which included new upstream O2 sensors. Now that my tank is really low, I might try half a tank of E85 and repeat my testing. But now I'm trying to determine when I actually tested it cuz if I remember it at all, it couldn't have been that long ago.

yes it's a 2012, my mpg is about 11 on 92 no matter how far or short I drive, drove all the way up as far north as you can go this summer nice long drive 11mpg lol

 

[Doubeleive]

Waitaminutehere, that’s supposed to be uber fuel!!

can't really even find e85 around here, there is supposed to be 1 station not all that far from me that has it and one in the next town over.

 

[gooffeyguy]

yes it's a 2012, my mpg is about 11 on 92 no matter how far or short I drive, drove all the way up as far north as you can go this summer nice long drive 11mpg lol

I've noticed mileage really starts to tank when going over 80 mph, so I'm not surprised yours is that low

 

[Doubeleive]

I've noticed mileage really starts to tank when going over 80 mph, so I'm not surprised yours is that low

truth! I noticed that a long time ago but I can't resist i'm a serial speeder have been my whole life

 

[Geotrash]

truth! I noticed that a long time ago but I can't resist i'm a serial speeder have been my whole life

Hence the 6.2L!

 

[Doubeleive]

Hence the 6.2L!

ya and i'm in real trouble if I ever put a supercharger on it, I just can't bring myself to spend the money-yet

 

[RooTBeeRthe1st]

I'm a lot more of an accelerator than a speeder.

Stop light to stop light...making a pass on the highway...

I really need to get that darn cam and supercharger in the engine bay. Pretty sick of looking at boxes.
It's tough without a garage and when it's your daily.

 

[89Suburban]

Finally had time to investigate the hack job splice on my heater line in the front wheel well. Oversized hose clamped down with screw clamps. One I sliced the old hose off saw the hacked up hard line. Cut the bad sections out with a tubing cutter. Installed new silicon hose and spring clamps. Made some insulating sections of hose where things may rub. Went a little bit overboard with the clamps just got extra sealing force and insurance. Fired it up and ran the coolant temp and pressure up to test for leaks. Came out great. One less thing on my mind to worry about. That old hose was beat and dried out. I use hose pinch pliers on the engine bay heater hoses to keep the coolant in the engine/radiator from draining out. Drain pan had about a quart and a half of fluid that came out.

 

[Rocket Man]

I'm a lot more of an accelerator than a speeder.

Stop light to stop light...making a pass on the highway...

I really need to get that darn cam and supercharger in the engine bay. Pretty sick of looking at boxes.
It's tough without a garage and when it's your daily.

Shit I installed my blower the first weekend it wasn’t raining, in my driveway. The cam was the same after I tried to get a shop to do it and they all told me they needed to pull the blower to do it. I tried explaining you don’t need to pull the heads or intake to swap cams in an LS and they all said BS. A couple weeks later I swung by and let them listen to the lope just to rub it in. And every time I worked on it, it needed to be driving by Monday so I could drive it to work. Just do it!

 

[gooffeyguy]

Shit I installed my blower the first weekend it wasn’t raining, in my driveway. The cam was the same after I tried to get a shop to do it and they all told me they needed to pull the blower to do it. I tried explaining you don’t need to pull the heads or intake to swap cams in an LS and they all said BS. A couple weeks later I swung by and let them listen to the lope just to rub it in. And every time I worked on it, it needed to be driving by Monday so I could drive it to work. Just do it!

How do you get the lifters off the cam?

 

[Rocket Man]

How do you get the lifters off the cam?

Spin the cam a few times by hand to get the lifters in the trays and then stick a dowel in through the oil passages from the front of the engine so they can’t fall down. I did both my trucks like this. There’s instructions in this link but they talk about buying a set of tools when actually it’s a pair of metal dowels. Iirc they’re 5/16 diameter, I can check the ones I made. They have to be long enough to reach the back of the block so I just made them a bit longer than my new cam. There’s other sites with instructions too.

LS1Howto.com

 

[swathdiver]

From what I understand, the E85 tables (spark/fuel) are seperate from the regular fuel tables. Many tuners don't mess with the E85 tables.

I run the 93 (or 92/91 whatever it is) octane Diablo tune and run E85 when not running 93

The thing I'm not sure is at what Ethanol percentage the ECM switches tune tables. @swathdiver

I believe there are high and low tables, my mpgs are basically the same E0 through E30 and the same E40 through E85.

 

[RooTBeeRthe1st]

Shit I installed my blower the first weekend it wasn’t raining, in my driveway. The cam was the same after I tried to get a shop to do it and they all told me they needed to pull the blower to do it. I tried explaining you don’t need to pull the heads or intake to swap cams in an LS and they all said BS. A couple weeks later I swung by and let them listen to the lope just to rub it in. And every time I worked on it, it needed to be driving by Monday so I could drive it to work. Just do it!

Also not done buying parts.
Kind of want to buy an alum block and just do a fresh build at this point.