2001 Buick Lesabre engine races

Tiny
BBOERSMA
  • MEMBER
  • 2001 BUICK LESABRE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 10,200 MILES
This is my girlfriend's car. She said that late last week (Thursday or Friday) she was driving along and pushed the gas pedal to pass someone, but when she let her foot off the gas, the engine kept racing. She had to shift into neutral and kill the engine to stop it. After she re-started the car, it was back to normal, and the problem hasn't surfaced since then. She had it examined by a mechanic (not a dealership), and this is her description of what he told her: He said she had a bad temperature sensor, but in order to replace that, he also had to replace a "gasket", and "something else related to the engine". She questioned him further, and he told her that if he didn't replace the gasket and the other thing that she could end up with coolant leaking into her engine. The total comes to about $800. I have three questions: 1) Can a temperature sensor account for uncontrolled accelleration, 2) what parts do you think he was talking about, and 3) does $800 sound reasonable? Thanks for your advice.
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Monday, September 27th, 2010 AT 7:46 PM

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Tiny
BLACKOP555
  • EXPERT
No temp sensor woudl cause that. And guess what. No temp sensor has a gasket either unless its a MAF and IAT integral and they rarely have a gasket and no where near a 800 fee, and it also wouldnt cause coolant to get into the engine.

Is the vehicle electronic throttle or does it have a manual throttle. I.E you can see throttle cables going to it and your able to move the throttle plate open or close by hand like on an older vehicle.
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Monday, September 27th, 2010 AT 9:26 PM
Tiny
BBOERSMA
  • MEMBER
The throttle has a cable. I checked it and it seems to move freely. Regarding the temp sensor, the garage told her that the sensor was reading -40 degrees and it could cause her car to be hard to start.

What if it was a coolant temp sensor? Is there major dissassembly involved to get to it? Like a head gasket or something?

I'm going to make sure she gets a second opinion.

I'm concerned that even if she has a bad temp sensor, that's not the real problem. This is a safety issue. Any idea what would make the engine race like that?
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Tuesday, September 28th, 2010 AT 3:07 AM
Tiny
BLACKOP555
  • EXPERT
-40 is a default value for a temp sensor when theres an issue. Sensor may be bad or the wiring may be bad either way it will show -40. Its not hard to do at all. I just simply unscrews and the new one screws right back in. Pretty simple.

Onlything to cause a cable actuated vehicle to race like that is for the iac to possibly be binding. I would be making sure the cable isnt internally damaged or pedal catching on anything first. Maybe broken spring on the throttle body
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Tuesday, September 28th, 2010 AT 6:00 AM

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