Problem with my 2003 Buick Rendezvous  service
engine soon.

Question = I just bought a 2003 Buick Rendezvous 2
weeks ago.  It has 78800 miles on it and started acting
funny today.  At idle and at very low speeds (when
we're first taking off, backing up or slowing down) the
car starts to sputter/jump and feels like it wants to cut
off.  At normal speeds, the car runs perfectly fine.  Any
ideas?

I will be more than happy to make a donation when I
get paid on Friday!  Please help if you can.  I just spent
$8200 buying this car from an individual and I am so
upset!  Thank you so much for you time.


Answer:
By what you are describing, it sounds like your engine
has a misfire. This is a condition were a cylinder is not
firing properly. Your condition is a misfire 'under load'.

Most misfires under load are caused by a problem in
the ignition system. IE- spark plug, plug wire,
ignition
coil. What you need to do is have the computer
scanned for codes. Anytime the SES (check engine)
light is on, or was on, the computer stores a code(s)
related to the problem. This would give an indication as
the what system is having a problem.

Far from popular belief, a computer scan does not tell a
tech WHAT the problem is, just what system is having a
problem, and the general area to begin diagnosis. Most
of the large national parts store chains can do a scan
for free.

If the problem gets worse, or the SES light starts to
flash, this indicates that the problem is bad enough to
cause possible
catalytic converter damage, so it should
be looked at ASAP, since catalytic replacement can be
very expensive.
Buick Rendezvous Idles Very Low and Engine Light

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Question: The Service Vehicle Soon light came on today and it
seems to be something with the Temperature gauge is not
working properly. What can we do?

Answer: What exactly is the temp gauge doing? What make
and model vehicle.

We have a 2006
Buick Rendezvous, The temperature is
registering a temp of 0, the gauge is not working.

OK. that is probably the reason for the service vehicle light.
The computer sees a problem with the temp gauge. Do you get
heat from the vents if you turn the A/C - heater to hot?

Yes, we are getting heat. The car does not seem to be
overheating, just not registering.

OK. The first thing to do is check the coolant level. If it is low,
that can cause the gauge to not register properly. If the level is
full, then most likely the coolant temperature sensor on the
engine is bad.

Is this something we can do ourselves and can you tell us
where the sensor is located.

Do you know the engine size?

3.5L V6.

First, the engine must be cooled down before you remove the
cap and check the coolant level. Next, Look at the picture in
this link -
3500 sensor locations. The coolant temp sensor is
located just above #5 in the pic. Sort of under the black plastic
tubes. You would need to drain some coolant before removal of
that sensor.

Ok, thank you for your help. It's really nice to know someone
out there can help. THANKS again. Have a great evening.