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  Topic Review (Newest First)
08-26-2011 01:18 PM
6Sixathome
Re: Puddle of coolant on the garage floor today!

I get it now, thanks guys



08-26-2011 10:48 AM
GM Customer Service
Re: Puddle of coolant on the garage floor today!

Quote:
Originally Posted by 6Sixathome
What does a knock sensor do?
The knock sensor is a sensor that detects the point of detonation in the engines cylinders. The knock sensor sends this information to the cars PCM, which makes adjustments to keep the engine operating near its detonation limit and running more efficiently.

Tricia, GM Customer Service.
08-26-2011 12:00 AM
medicrxdoc
Re: Puddle of coolant on the garage floor today!


Answers.com > Wiki Answers > Categories > Cars & Vehicles > Auto Parts and Repairs > Car Electronics Electrics and Lights > Car Computers and Sensors > What does a knock sensor do? Answer: Improve

It allows the engine to run with the ignition timing as far advanced as possible. The computer will continue to advance the timing until the knock sensor detects pinging. At that point the computer retards the ignition timing just enough for the pinging to stop.

A knock sensor assures that you're getting as much power and fuel economy as is possible from your engine.




knock sensor



The knock sensor responds to spark knock caused by Pre-detonation of the Air/Fuel mixture. As the flame front moves out from the spark plug ignition point, pressure waves in the chamber crash into the piston or cylinder walls resulting in a sound known as a knock or ping. This is caused by using a fuel with a low octane rating, overheating, or over advanced timing. Sometimes it can be caused by hot carbon deposits on the piston or cylinder head that raise compression. A knock sensor is comprised of Piezoelectric materials; Crystals that when impacted, generate a voltage (same idea as a BBQ ignitor). This voltage is monitored by the computer, and when an irregularity is detected, the computer corrects timing in VVT (variable valve timing) engines, or triggers a DTC Diagnostic Trouble Code) in older vehicles.




Read more: http://wiki.answers.com/Q/What_does_...#ixzz1W6H0F2Be
08-25-2011 11:47 PM
ls973800
Re: Puddle of coolant on the garage floor today!

Basically the knock sensors detects "ping" caused by poor fuel/poor combustion conditions. It causes the engine timing to be changed to prevent the pinging which could otherwise damage the engine.

Many cars which say to operate only on premium fuel can run on lower grades of fuel because the knock sensor and other sensors will adjust the engine to run on the lower grade of fuel. The mileage and power will be somewhat negatively affected, but there are those who say they have never run the "required" premium fuel in their engines with no problems.
08-25-2011 01:48 PM
6Sixathome
Re: Puddle of coolant on the garage floor today!

Quote:
Originally Posted by medicrxdoc
From what I understand, knock is the same as/close to pinging caused from fuel combustion problems.

So somehow the sensor measures this?
Maybe it's able to tell if you got bad fuel or something.



08-24-2011 10:35 PM
medicrxdoc
Re: Puddle of coolant on the garage floor today!

Quote:
Originally Posted by 6Sixathome
What does a knock sensor do?
From what I understand, knock is the same as/close to pinging caused from fuel combustion problems.

So somehow the sensor measures this?
08-24-2011 07:54 PM
6Sixathome
Re: Puddle of coolant on the garage floor today!

Quote:
Originally Posted by tev9999
Replaced the knock sensor and all seems well. No complaints about the dealer (Hamilton Chevy, Warren MI). These are the first functional issues I have run into in 48,000 miles, and hopefully things "come in threes", so I am done. Also hoping an odd coincidence that all three appeared within a few days.
What does a knock sensor do?



08-24-2011 03:31 PM
tev9999
Re: Puddle of coolant on the garage floor today!

Replaced the knock sensor and all seems well. No complaints about the dealer (Hamilton Chevy, Warren MI). These are the first functional issues I have run into in 48,000 miles, and hopefully things "come in threes", so I am done. Also hoping an odd coincidence that all three appeared within a few days.
08-24-2011 01:37 PM
GM Customer Service
Re: Puddle of coolant on the garage floor today!

Quote:
Originally Posted by tev9999
Looks like I have the same problem on my 2008 XR FWD. I've found a puddle on the driveway the last couple days. Probably a 12-16" diameter wet spot after it sits for 4-8 hours. Thought it was oil since that was low, so I took it to Goodyear for an overdue oil change and tire rotation. They told me the oil is fine, but the water pump is leaking. They also found a transmission leak at the right side axle seal.

I assume both of these issues would be covered under the 100K mile powertrain warranty. I'm close to 48,000 now.

Is this a multi-day job for the dealer? I'm not really thrilled with the service I got at the Chevy dealer that will shuttle me to work. I'd rather take it somewhere near home and get a loaner, but they usually fight on that if they are not keeping it overnight.
Keep me updated in regards to your progress at the dealer. Feel free to send me a private message if you have any questions in the meantime. Thank you.

Tricia, GM Customer Service.
08-24-2011 08:06 AM
6Sixathome
Re: Puddle of coolant on the garage floor today!

Quote:
Originally Posted by tev9999


Got it home fine. Next start the engine light was on. Back to the dealer and it is giving knock sensor codes. They immediately agreed to a loaner, so waiting on Enterprise to open.
Did they get it fixed or have to order parts?



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