[V8] Bogging Down

[Dave Saad]

The timing sensors should throw codes if they are going bad, and you can test them out of the vehicle pretty easy.
Also note that the test procedure can MAKE them bad too if you are not careful.
To test, lock a sensor in a vise, connect a ohm meter to the signal wires, and evenly heat the sensor with a hot air gun.  If you see the resistance rise then open (infinity ohms) then you have a bad sensor.  Don't get too crazy with the heat or you may break an otherwise good sensor.

The sensors are just a iron bar with a lot of turns of very fine copper wire - and heat cycles cause expansion which eventually breaks the wire.  As it cools, it makes contact again.
It appears that all sensors will fail at some point.
I have had some kludged up ABS sensors in my car for about a year with no problems.  Not sure if I recommend it to anyone else, but it is cheap (as in free) but possibly not reliable.

Dave

On May 30, 2011, at 10:43 PM, Paul Jager wrote:

> Sensors seem to be good .....hmmm don't like the sound of that. You have to know they are good and have been replaced on that engine My sensors went at the same mileage at it is term exposure heat that does it, like clockwork too. I thought it was the fuel pump as well.
> If you can spray ice water on the area when the failure occurs you'll know right away.
> 
> MAF failures are typically no start.And if you do get it going...horrible running. Unplug and run in limp mode
> TPS ques the idle control to function. Might do some other stuff in motronic.
> Knock sensors are a timing trim. They retard the timing so it would be loss of snappiness but I have never seen any of them fail.
> 
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> 
> ----- Original Message ----- From: "Jeff K" <jkaliszewski1 at roadrunner.com>
> To: <v8 at audifans.com>
> Sent: Monday, May 30, 2011 9:06 PM
> Subject: [V8] Bogging Down
> 
> 
>> Car has 131,000 miles, new fuel filter, sensors seem to be good, no starting issue or stalling. Might try a new MAF. Anyone got an extra for a reasonable price?
>> Jeff
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