Skip the auto shop - Our mechanics make house calls

Q: Intermittent "no start" or dies while running fine on highway - what's wrong? 2003 Buick Rendezvous

asked by on

Sometimes jumping it helps sometimes it starts on its own sometimes it dies driving down the road. When it dies the rpms jump around and then it dies. The last time it locked up the security system as well.

My car has 220000 miles.
My car has an automatic transmission.

A: Hi there: Once the vehicle starts, the job...

Hi there:

Once the vehicle starts, the job of the battery is pretty much done; which means if you're having issues with the vehicle shutting off, it's most likely caused by ignition system components; such as a the distributor or the crankshaft position sensor perhaps. It's possible that you have battery cables that are corroded or a battery that's losing cold cranking amps. Since there are multiple items that could be causing your issues, it's probably a good idea to have a professional mechanic complete an engine is hard to start inspection.

Was this answer helpful?

A: Hello - you don't indicate if either th...

Hello - you don't indicate if either the "no start" or "dies while running down the highway" scenarios results in a Check Engine light condition, but I would check for problem codes either way. For both stalling and no-start conditions, a failing crankshaft position sensor or a failing fuel pump/faulty fuel pump relay would behave similar to what you are experiencing. I believe these problems have the same source. I would recommend a thorough inspection of the fuel supply and ignition systems completed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: My car won't start.

Hello, thanks for writing in but you did not mention the make, model, or year of vehicle. However, this problem is most likely caused by the ignition switch not making good contact. Check and replace the ignition switch if it's...

Q: blower for heat and air

This is caused by a shorted blower resistor. Replace the resistor and it should fix the problem you're having. The resistor is next to the blower motor, located under right side of the dash. If you need some help with...

Q: I need to replace plugs and wires and need to know how far forward I can roll the engine with an awd driveshaft and pto?

I would consult your Owners Manual for specifics, but most manufacturers provision the vehicle to be towed short distances at slow speeds safely. The important factor here would be that all 4 wheels are rolling the same speed (i.e. now...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.