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Chevrolet TrailBlazer, GMC Envoy, Buick Rainier, GMC Envoy XL, Isuzu Ascender, Oldsmobile Bravada, SUV
#10601 of 18329 Pedal Noise & Vibration
Mar 17, 2003 (7:22 pm)
I was browsing the GM Techlink when I saw this section on a common complaint expressed by some members of the board, sorry if this has already been posted. There are two sections below!
Accelerator Pedal Buzz and Vibration
This condition affects some 2003 Silverado, Suburban, Tahoe, Avalanche, Sierra, Yukon, Denali, Escalade, and EXT vehicles.
Owners may experience a buzz noise which can be heard and felt, from the accelerator pedal area on the first acceleration after starting the vehicle. It will occur only the first time the vehicle reaches approximately 10 mph (16 kph) after start-up. It will not occur again until the key is cycled off then on. Based on the driving habits of the owner, the condition may occur at approximately the same time as the 1-2 shift of the automatic transmission.
This noise is caused by the Supplemental Brake Assist (SBA) performing a self-test. The SBA, which is mounted to the brake vacuum booster canister, is new for 2003 and provides vacuum for the brake booster in case of low vacuum or vacuum loss.
This is a normal condition and no repair attempts should be made.
The SBA is used only on vehicles equipped with vacuum brake boosters and is not used on vehicles equipped with Hydra-Boost brake systems.
- Thanks to GM Technical Assistance
return to Table of Contents
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Engine Noise and Vibration Owners of some 2002 Chevrolet TrailBlazers, GMC Envoys and Oldsmobile Bravadas with the 4.2L LL8 engine may experience noise and vibration between 800 - 900 rpm. They may comment about engine buzz noise, and vibration felt at the accelerator pedal, steering wheel, and center console.
Verify that the intake pre-plenum is securely mounted. Press down on the plastic intake pre-plenum. If the vibration is eliminated, replace the intake pre-plenum with part number 15176239.
- Thanks to GM Technical Assistance
#10602 of 18329 Response to giddens john, post #10553
Mar 17, 2003 (7:37 pm)
Guess I hit a nerve, sorry. My gripe isn't with rubber mats, it's with the CSP design. CSP may look "rugged" on a commercial pickup truck, but it's like denim at a prom in the interior of a new Bravada.
As to water on the WeatherTech carpeted mats, you may not be aware that those mats are designed to hold a quart and a half of water each:
and clean-up hasn't been a problem with the ones we put in our 300M. Did well enough this winter that the wife wants them in our Bravada.
We got involved with WeatherTech products about 5 years ago with their all-rubber mats and a cargo liner in our S-10 Blazer. The cargo liner held up well against 3 dogs, their food and water, and still looked good. So, that's the way I went with the Bravada cargo liner.
Their rubber mats have also done well and are quite attractive. We went to their carpeted mats for the 300M for style and have been quite pleased. However, if you get all the stuff on your Bravada floor that you claim (my wife would hold executions if gum, grease, and (fill in the blank) were common deposits in our vehicles, even the old ones) the WeatherTech rubber mats would be an attractive alternative:
Admittedly that doesn't solve the "dead pedal" cover problem, but that was the point of my original post. Vendors should read these boards. There are plenty of needs expressed here, that a good marketeer could fill for a profit. A simple, substitute, "dead pedal" cover is one of those needs.
#10603 of 18329 re vibes Bruiser 1
Mar 17, 2003 (9:09 pm)
Hey bruiser as I speak, my Tb is in the shop, The 6th time, what you describe has nothing to do with our vibration problem! My vibration is from 1200-2200 rpms 40-65 ish MPH's This is 85% of the people in this townhall. There is no fix as of yet, its a frequency issue between tranny----------->drive shaft-------->rear end ect...Spring replacement does help on some or most, but not mine!!! Oh well thanks for the post!
Mar 18, 2003 (4:12 am)
FYI - Had the recently issued calibration updates performed yesterday to correct the hesitation problems with the previous GM calibration update.
Appears that this new program is an improvement. TB ran much improved. Torque is back, on light throttle and low RPM.
#10606 of 18329 gas pedal vibrations on TB
Mar 18, 2003 (7:31 am)
Hey allan and 2 yearlease- Thanks for all the info. on trying to get our "problem" fixed.Let me know if something works today with your dealers as it seems you both have your vehicle in for repair today. regards,bob
#10607 of 18329 Anyone with High-Pitch Chirp?
Mar 18, 2003 (10:02 am)
Has anyone noticed a high-pitched chirp coming from the front-driver's side of their Triplet? It sounds like there is a sparrow or some other small bird chriping away no matter what speed I drive on Interstates or side roads. I can't tell if it is a wheel bearing or a squeaky suspension joint. Any feedback would be appreciated.
TBLT 4WD, 43000 miles, 15 days short of 2-year anniversary
#10608 of 18329 brake goes all the way to the floor - normal??
Mar 18, 2003 (11:50 am)
rented a 2003 trailblazer last night. i found out that if you depress the brake pedal while the vehicle is idling, it goes all the way to the floor and makes a "whoosh" sound. no matter how many times you pump the pedal, it always whooshes to the floor. while the vehicle is in motion, the brakes work fine - pedal does not reach floor level. no brake failure indicator lights are on. wife took it back to the rental agency this morning, and they said this is normal. any opinions or comments?
#10609 of 18329 Forward Chirpping - re blrmkr
Mar 18, 2003 (2:15 pm)
blrmkr, try lubing the hood latch. Our 02 TB was in the shop for this a while back and one of the techs traced it to the hood latch. The latch mechanism was lubricated and the annoying chirp ceased. Hope this helps.
#10610 of 18329 Brakes and windnoise
Mar 18, 2003 (3:51 pm)
I too was worried about the brakes going to the floor at idle, but this is normal in various triplets I have driven. I don't know why they do it though, maybe to limit pressure on the system.
Is there anyway to post photos without a website?