Last post on Dec 09, 2013 at 7:21 AM
You are in the Buick Rendezvous
What is this discussion about?
Buick Rendezvous, SUV
#1209 of 2541 Re: Is the Rendezvous a good buy???? [nickx281]
Aug 27, 2005 (10:22 am)
I have already bought one (a 2003 CXL). My post in #1199 was in response to another poster who had asked whether the Rendezvous was a good buy. I am very sorry to hear about your difficulties with your car. I haven't had nearly the trouble (yet), but I don't have the kind of confidence in the car that one should given the price and the fact that it's a family car. The only issue that I have had during my ownership of the car (I bought it two years old with 40,000 miles on it) was a head gasket issue that apparently had not been completely resolved by earlier work done by the previous owner. The troubles that you have had seem to be very common to the 2002 Rendezvous, and Buick really should do a recall to address the A/C, wheel bearings, and head gasket issues.
#1210 of 2541 Re: Gas Mileage, Help! [tablescape]
Aug 27, 2005 (10:31 am)
I have an '03, AWD Rendezvous, and gas mileage has been disappointing. On long highway trips with A/C running and 4 people aboard (2 adults, 2 children), the best I get is about 21mpg. Around town, I have seen the average sink to 12 mpg. I assume that if I turned the A/C off there would be a slight improvement, but overall I have not been impressed with the gas mileage.
#1211 of 2541 Re: No restart after re-fueling [afmark]
Aug 27, 2005 (6:53 pm)
Well it's been a couple of weeks since the dealer replaced the ignition module and passkey security system. Last week after refueling the engine started and stalled. But then it started right up and ran fine. I spoke to a service advisor. He was going to do some research and call me back. That was almost two weeks ago. Tonight we filled the tank. The engine started, stalled and would not restart. The car has been towed to the dealer again. The towtruck driver thinks that it might be the key itself.
#1212 of 2541 Re: No restart after re-fueling [chrisrappl]
Aug 28, 2005 (11:00 am)
Interestingly enough, I had the pass lock replaced a couple of weeks ago. The vehicle seemed to start OK although it was not too hot outside. One start after a short shutdown was kind of iffy. It started, stalled and re-started OK just like your vehicle. However, my wife could not start it in our garage with her key, so I had to take it back to get her key programmed. After 3 hours they gave up and ordered a new part which has now been installed. So far no problems, but I must admit I have lost confidence. It is almost autumn up here in Maine and the days are getting cooler so I expect I won't have a problem until next year. I now carry a small wrench with me so I can disconnect the fuse panel to "reboot" the system as I hear this seems to work. I know from experience that if you wait for about 20-30 minutes with the ignition completely off, it seems to start OK.
#1214 of 2541 Re: Gas Mileage, Help! [claude3] - A Mileage Primer
Sep 02, 2005 (6:24 am)
There are so many misconceptions about gas mileage generally that I would like to attempt to clear them up. The single biggest determinant of mileage is weight. It's simple physics. It takes "x" units of energy to move "x" pounds from point A to point B. Since the energy in a gallon of gas doesn't change and the length of a mile doesn't change, the weight is the major determining factor. That's why a V-8 in the same car vs. a V-6 has worse mileage. Not because a V-8 has 8 cylinders running vs. 6 (it will run at lower RPM's than a 6 to offset the difference) but because the V-8 is physically heavier than the 6 in the same car, therefore it takes more energy (hence worse mileage) to move that heavier engine. It's the same reason why AWD or 4WD is worse than FWD. Not because four wheels are turning - that makes no difference. The difference is that in the same vehicle, AWD is simply heavier than FWD because of the extra transfer case at the rear axle. With all else being equal, a 2000 pound vehicle will have exactly double the gas mileage of a 4000 pound vehicle. It's really just as simple as that. I've never gone through the exercise, but to compare apples to apples, compare the EPA listed mileage between vehicles (despite the fact it doesn't represent real world, it's a consistent benchmark for this purpose) to the weight of those vehicles and you will find a pretty consistent ratio. Having said that, there certainly will be variations due to driving habits (heavy foot means more revs per mile), driving speed (high highway speed means more revs to overcome exponentially higher drag at significantly increased speeds), vehicle shape (the higher the coefficient of drag, the more revs required per mile), efficiency of engine (the more efficient in converting the unit of energy in gas into revs, the better the mileage), driver weight (230 pound man vs. 120 pond woman), a/c usage (higher revs to run that compressor), tire pressure (lower pressure means more tire contact with the road, hence more friction to overcome) as well as a few other things I'm sure I've missed. But the point is that these are all minor variationscompared to simply the weight of the vehicle (and contents). The biggest improvements in mileage that Detroit has made in gasoline engines over time is simply by using more aluminum and plastic vs. steel, hence making cars lighter.
Hope that helps.
#1215 of 2541 Re: Gas Mileage, Help! [claude3] - A Mileage Primer [nosuvyet]
Sep 02, 2005 (8:07 am)
That is informative, but I am the only occupant most of the time in the car and I am not carrying anything in the back... We took the car on vacation for a 200+ trip one way and varying our speed using the cruise control the best we got was in the low 20's. I don't know what Buick or the EPA did to get 28 mpg. There were 2 adults and one child in the car and a few pieces of luggage and the air was on its lowest fan setting. I just don't think this car is coming close to what it should. Now GM Customer Service says they can't do anything more to help me and have closed my file. I am so frustrated I can't stand it!!! I don't know what to do now or where to turn. Anyone have any ideas?
#1216 of 2541 Re: Gas Mileage, Help! [claude3] - A Mileage Primer [nosuvyet] [socalsandy]
Sep 02, 2005 (8:44 am)
What was your speed. Did you accelerate briskly or gently from stops or when passing cars? Mileage varies greatly with how you drive.
#1217 of 2541 Re: No restart after re-fueling [afmark]
Sep 03, 2005 (10:22 am)
Thanks for the reply. The dealer could not duplicate the problem and asked us to come pick up the car. We arrranged to come back when it needed gas and the service advisor would come with me to the station to see if it failed to start after refueling. The next evening it failed to start in our garage and would not start for over 14 hours. It finally started when I tried it almost 20 hours after the first attempt. I brought it in and they were able to download a fault code that they did not think was the problem. It started and ran fine that whole day and the next morning. That afternoon it failed to start (8th episode) and we had it towed in. This morning it started for the Dealer, they took it for a test drive, shut it off and it would not start. They replaced the fuel pump (second time) and I brought it home. It seems fine now, but, time will tell.
#1218 of 2541 Re: Gas Mileage, Help! [claude3] - A Mileage Primer [nosuvyet]
Sep 03, 2005 (8:26 pm)
Your premise that weight is a factor in fuel mileage is true, but its really only a small piece of the equation. (in fact, when it comes to travelling on a flat highway weight doesn't make much difference at all).
Wind resistance, rolling resistance, and engine efficiency are all very big factors in fuel mileage. For example, a Rendezvous Ultra FWD is about 18% heavier than a Ford Escape AWD, but uses 23% less gas (per EPA highway estimate). Obviously there's way more at work than just the weight of the vehicles.