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Comments
Truck didnt get fixed they didnt get to it. I was mad because it sat all day and they were supposed to call me to tell me they couldnt get to it.
About the bedrails one main reason i would say dont go over the rail is because if you are in an accident and they need to do body work the whole side of the truck needs to be painted. Its easier to remove the rail caps vs the over the rail. I learned this first hand i had that scracth i was so lucky i had the rail caps.
Theh are made by wade.
http://www.wadeauto.com/
RYan
In your example you retard the timing 1 degree at 2600 rpm. Is that from TDC to 1 ATDC? Or from nominal timing for this engine (10-25 degrees BTDC to 9-24 BTDC). In either case I don't see why 1 degree retard would have much affect.
Every engine I've ever worked on has exhibited ping from too much advance and poor running from too little advance. The rule of thumb that has been universally accepted (until now) is:
- More advance until you get pinging, then retard
2-3 degrees.
And based on schooling and everything else I have learned about engines logically supports that is understandable.
You keep saying that retarding timing causes pinging, but why? What is the mechanism that causes autoignition? It takes a combination of pressure and temperature to cause autoignition. With excessive advance the mechanical compression and combustion pressure combine to cause the fuel mixture to ignite. In a diesel it is simply mechanical compression and operating temperature to cause the fuel to ignite.
When the ignition is retarded there is no cause for autoignition. Uncontrolled waves are not caused by retarded ignition. They are always present. Are you saying that if the spark is retarded enough that autoignition will always take place? Wouldn't that make it difficult to shut off an engine that has a carburetor? Turning off the key stops the ignition, or it retards the ignition infinitely.
Almost all engines shut off immediately when the ignition is stopped. No autoigniton, no burps, nothing, they just stop.
Why, because retarding the ignition timing does not cause autoignition. Advancing timing does.
My thoughts.
I'll find that textbook tonight (maybe not, it's my wife BD) or tomorrow night.
Mike L
bco (kyle)
getting my line-x utr sprayed in on monday. will take and post as many pics as they will allow. hope to have them posted by tuesday afternoon or so. will let you all know.
pat,
for the same reasons ryan explained, i'm doing the under the rail spray in with wade bed rail caps. cost turns out about the same. (otr vs. utr with rail caps) plus, i'm afraid i'll strangle any sob who screws up and drips the otr down the rear 1/4 panel.
bco
Gist of my original comments were:
1) my '99 4.8L has a propensity to ping on 87 octane at WOT above 3,000 rpm pulling a heavy load at 2,000' to 6,000' elevations. The knock sensor apparently doesn't retard enought or doesn't detect ping at higher RPM's.
2) previously had the software update, which was supposed to reduce ping.
3) the ping is severe, happening on all 8 cylinders.
4) premium fuel eliminates this problem
5) the shop manual recommends premium for best performance.
My main passion in life is racing off road motorcycles, and over the past 23 years of racing have learned how both 2 and 4 cycle small, high output engines respond to excessive timing advance, lean jetting, and insufficient octane. My '99 seems to need higher octane fuel when run near its GCWR, considering the preprogrammed nature of jetting and spark advance.....
So what were we arguing about?
Dustyone
Tranny fluid - used GM syncromesh, old fluid looked fine.
Rear locker Diff - came with GM synthetic. Had two pinion seals replaced under warranty. They refilled each time. Have not changed the rear, as the GM Locker fluid is/was on backorder.
Couple or more quarts in front..... Buy extra, return what you don't need (or spill).
I usually change out at a year, then every 60k miles after that unless I submurge the truck....
JEEP says change diff's fluid every 12k miles if offroading alot. Probably cuz of moisture.
I occasionally go "race truck" for 10 miles or so on forest service roads in 4wd so my front diff gets warmed up and the water is driven off....
My position is and will be that too much advance will cause an engine to ping.
Phil keeps saying if and engine pings give it more advance. I say that can damage an engine.
We hope to resolve this before the end of the year.
Mike L
haven't changed the front diff and i don't have a manual tranny...
bco
Dean
hey ryan (or anyone else who's had a spray-in put in) what do they do about the three bolts that secure the tailgate handle mechanism? do i need to provide a piece of sheet metal or will they leave a 6" by 6" patch exposed or what??? thanks...
kyle
Kirk
If anyone would like to see the pic here it is:
www.gorancho.com
Jeff
Kyle on the bolts i think mine were removed then put back on? The tail gate is lined and the 3 bolts are exposed (be careful when you sit in the tailgate i put the palm of my hand on one and it left a very nice mark).
Hope this helps
Ryan
Mark
Picked snug partly due to 4 tube gasket along bottom rail. I also have dash squeaks, goes away (temporarily) when I push on dash above steering column. Other than that no probs w/ 3600 miles-avg 16mpg mixed.
kyle
Kyle no i jumped up on the tailgate to sit down and i pushed with one of my hands and it happened to be over one of the bolts pretty much all of my weight was on this hand and it left an indentation of a bolt in my hand for a few hrs. No biggie just giving you a warning.
Yes i have a rhino liner. Its soft but not that soft. Its perfect. The line x is harder though i will tell you that.
Ryan
Ryan
Dean
Ryan
dean...no sh*t, man! i was like, "what, you can put a HAND print in one of these things!?! damn, what am i thinkin'?"
i feel much better knowing that the mark was in ryan's hand. yes ryan, metal, when pressed against your skin will leave a mark. the harder/longer it's pressed, the longer the mark will stay. i kinda took this as common knowledge, which is why i wasn't sure if the mark was in your hand or not...anyways, thanks. leaving at 11:00 today to drive to n. augusta (64 miles away) to get the line-x sprayed in. wahoo!
kyle
Have fun
Ryan
bco
Ryan
And off the subject a little. Yesterday I saw a GMC Yukon XL but it was as long as a suburban and it looked to be a 2500 from the look of the wheels and it has the new roof lights on it as on the 2001 H/D trucks. Is GMC going away from the suburban name or what did I see.It was hard for me to tell as I was going 70mph in St.PAUL.
Thanks Andrew
I posted some brochure pics on my site...they are in a topic called HD brochure..or something like that?
www.teleweb.net/mgdvhman/index.htm
- Tim
Other question on 4wd use.... Only use on low traction surfaces, and once a month for a good 20 miles at speed will probably get the diff oil hot enough. Hope you have a good place to run 4wd. If not, change your front diff oil frequently. An advantage of the old manual locking hubs is that you could lock em in, spin the front diff, without putting it in 4wd. Wish all the manufacturers would go back to the old system.
The GMC Suburban is now the Yukon XL
Nick
Dean
Chevy = Suburban and Tahoe
GMC = Yukon XL (previously suburban) and Yukon
Yes they make a 2500 version of the suburban and Yukon XL
Ryan
However, check with your particular hitch manufacturer before you do anything. Some mfrs. recommend the hitch go in first to be sure the bolts are properly seated and torqued - there was apparently some concern that the hitch could "walk" its way loose if it was installed over the liner.
Your exact question showed up in Trailer Life magazine several months ago, and their recommendation was exactly what I just described above.
I know when I was looking at spray in liners, one applicator (Toff I think) described in their brochure where they could spray around a fifth wheel hitch that was already installed.
Thanks ill have more pics whenever i get my damn tail light guards too
Ryan
Ok another subject. For you Zaino users, did you use the clay bar, even though you had a new vechicle? If you did they recommend mixing Z-7 car wash with water to be used as a lubricant for the clay bar. Now i did not get the Z-7 car wash so is say Armor-all Car wash good enough for substitute, i am guessing probably yes. The Zaino sight does not give alternatives for the use of another soap.
pat
I picked wade because i couldnt find any other bedrail caps other than DEEZEE or brands which were metal (black or chrome). Also GTS came out iwth some right before i got mine but i didnt get a chance to see them. I actually seen the WADE at a parts place and they looked very nice.
Ryan
markings. then again, ford was never something
that i looked at anyway.
may buy the wife a '01 Tahoe soon.
...red
Scott
kirk
Yep - my seat drives me crazy as well. Happens still almost on a daily basis. Don't get me wrong - I love the seat and the options, but every few times getting in the truck the lumbars are right in the middle of my back. I made note of it here and to the dealer within the first week of having the truck. No solutions anywhere.
I tried everything to duplicate it and watch it happen - never could.
Then one night a few weeks after that I was out messing with the Hypertech and the truck. All of a sudden I could here it and it was expanding. I looked down and realized I was sitting about half way in the truck- about the same position as if getting in or out of the truck - and my leg was actually against the button causing the inflation.
I was happy at the time that I thought I knew why it was happening. But 4 months later it still happens on a daily basis almost and I've paid close attention - I know my leg does not hit that button when I get in and out of the truck. I think the wiring mechanism or circuit board or whatever is behind the switch is getting activated in some way when I get in and out and am on the edge of the seat, but I don't think it is randomly doing it on its own anymore just sitting there in the garage like I used to think.
Experiment with this and listen when you get in and out and see if you agree or disagree with the theory.
Greg
By the way guys - I've started a new project and actually have to work about 8 or 9 hours a day (plus driving an hour each way) so I'm not keeping up with you like I used to. You all can sure create a butt load of posts. Hard to keep up with everything.
kyle
kyle
Dean