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.
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Buick Rendezvous Idles Very Low and Engine Light On
Live Chat:

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.