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Checked the pre-catalytic conv. O2 sensor and it was black and sooty. Replaced all the plugs and found that 4 on passenger side were fine but ALL 4 on driver side were black and sooty like the O2 sensor. Leads me to believe the mix is too rich on that side. Is this something to do with the fuel rail or some valve that is specific to that side?
You would think there would be a default password if I as the consumer never set a passcode?
Any way around this or am I stuck taking the Tahoe in?
--jay
Have a strange problem that dealers, as well as myself have yet to figure out. It only happens when in the Auto 4WD mode. When accelerating b/w 25-40 miles hour, I can really feel a noticeable skipping, hesitation, or an emulated feeling of misfiring.
First of all, it’s very difficult to articulate. However, very rough feeling needless to say. Doesn't happen in 2WD mode at all. Smooth as a baby's bottom. All this on smooth highway. Ran all scanners to no avail. Last dealer reset tranny memory, and obviously didn't work.
My first inclination was it has to be the tires or the wheels are unbalanced, because the AUTO 4WD mechanism is looking a situation in which the vehicle needs 4 wheel drive or else it drives no different than 2WD and that skipping is in search of something, like the tires are trying to grab or dig in the road surface. .
If anybody has had this problem or similar problem and/or can help, please reply.
Thanks in advance.
Every cold start, there was the engine knock for about 1 minute and then it went away.
At my next oil change, rather than stick to the owner's manual oil recommendation, I used Castrol 20W50 with one quart of the Lucas oil additive in March 2006.
It took a bit of driving I believe to distribute the oil additive, but the knocking has been gone for over a month already. With the thick oil my gas mileage is 13-16 mpg. I’m not sure this solution will work in the great white north, but I am very encouraged with the results here in Florida.
KC
There's been a chevy in my driveway my whole life but this on'e getting a for sale sign as soon as I get it back!
The previous owner also had a brand new a/c compressor installed which so far works fine.
Thanks
First thing, the truck runs good. Bad thing, the Tranny is making a hard "clank" noise everytime it shifts to 2rd or to 3rd gear at 1500 RPM. And when it slows down, it does the same thing...
Is it something that could be easily fixed? What could it be? Does it need a new Transmission already?
20W50 and 20% Lucus oil additive will quite it.
To fix, your best option is to have a trim specialist, usually a contractor that visits dealerhsips to do the touchup work. He or she will spray paint it for you. The matching of the colors is worth their cost, likely under $100.
I have had the same problem with my Tahoe which is also a 99. Luckly for me when we replaced the fuel pump we cut a trap door from the back seat under the carpet. Well anyway mine was doing the same thing so i would knock on the fuel pump twice and it would start. I got sick of doing that and figured out that the plug for the fuel pump had a short in it and since replaced no problems. May work for you but u might have to drop the tank to do so.
I decided to replace leaking oil lines from front radiator to oil filter housing. When lines are hooked up, they leak. Cannot determine why they leak.
Anyone have any ideas????
Thank You,
Rod
get a false gear indication.