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Old 07-21-2018, 05:16 PM   #1
Bruce Rock
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Join Date: Sep 2007
Location: Kaukauna, WI
Posts: 230

2000 SL2
2006 VUE 2.2L
Default Bad ground caused muffler blowout

I had worked on the ground at the starter after my wife came home from a 250 mile trip during which she had neither A/C or a reliable speedometer. I cleaned up the ground on the starter and that seemed to fix the speedometer. Thanks to fdryer's posting on how the temperature sensor on the expansion valve effects the compressor operation, the air was fixed.

On the way home from another 250 mile trip, the cruise and speedometer stopped working. Decelerating down an off ramp, she heard a LOUD BANG! and than loud exhaust noise. She was sure she did not hit anything in the road

As DrewBrews stated, a bad ground can cause a backfire that will cause a muffler to blow. How that raw gas can get past the converter is beyond me (I hope it doesn't mean my cat is bad).

While the first time I didn't follow Waiter21's advice to add additional ground wires between different points in the engine compartment, I feel, after loosing a muffler, I did it one better. I changed out the negative battery bolt with one having an add-on post and ran three additional ground wires (14 ga) off it to the three existing ground points Waiter21 used.

While I feel these additional grounds make the engine more reliable, They did not solve the speedometer problem.
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