Muffler and AHC Issues..Help!

[fumetsu]

Hey guys,

I own a 2002 LX470. It goes from N to H and to L flawlessly, but at N, the passenger side rear is about 2" higher than the passenger side front. The fronts are even. Also, the rears are both higher than the fronts by about 2", but I assume this is normal (?) Can anyone chime in about this?

Also, my muffler rusted out and is in need of a replacement. What tubing diameter should be used? I am not looking for a louder truck. Just an inexpensive, stainless steel muffler that won't rust out on me. Would something like this do the job?

Amazon.com: Magnaflow 12256 Satin Stainless Steel 2.5" Oval Muffler: Automotive

Thanks for your inputs.

 

[fumetsu]

Some pictures for further clarification:

<a href="http://www.flickr.com/photos/84021572@N03/7693052172/" title="photo (1) by 2002lx470, on Flickr"><img src="http://farm8.staticflickr.com/7251/7693052172_3d7013e355.jpg" width="500" height="373" alt="photo (1)"></a>

<a href="http://www.flickr.com/photos/84021572@N03/7693052414/" title="photo (4) by 2002lx470, on Flickr"><img src="http://farm9.staticflickr.com/8028/7693052414_0a6317c74b.jpg" width="500" height="373" alt="photo (4)"></a>

<a href="http://www.flickr.com/photos/84021572@N03/7693052272/" title="photo (3) by 2002lx470, on Flickr"><img src="http://farm8.staticflickr.com/7255/7693052272_9f5dcaa2c5.jpg" width="500" height="373" alt="photo (3)"></a>

Front Passenger:

<a href="http://www.flickr.com/photos/84021572@N03/7693052622/" title="photo (6) by 2002lx470, on Flickr"><img src="http://farm9.staticflickr.com/8011/7693052622_f09e9f99a3.jpg" width="500" height="373" alt="photo (6)"></a>

Rear Passenger:

<a href="http://www.flickr.com/photos/84021572@N03/7693052518/" title="photo (5) by 2002lx470, on Flickr"><img src="http://farm9.staticflickr.com/8010/7693052518_9fc80e1e7c.jpg" width="500" height="373" alt="photo (5)"></a>

 

[2000UZJ]

Can't comment on the AHC issues, but I just installed a Flowmaster 50 Series and it sounds fabulous. It's starting to open up (about 25 miles on it so far) and it's getting a little bit throatier. I'll post up in a few days once everything has opened up (high flow cats, new muffler).

 

[agaisin]

Hey guys,

I own a 2002 LX470. It goes from N to H and to L flawlessly, but at N, the passenger side rear is about 2" higher than the passenger side front. The fronts are even. Also, the rears are both higher than the fronts by about 2", but I assume this is normal (?) Can anyone chime in about this?

I believe 2" difference is a bit more than normal. I'm assuming you have stock TBars and stock Springs in the rear and your vehicle has a full tank of gas and nothing loading it down in the front. Also, do you have any AHC DTCs?

Given the above qualifications, it could be a faulty height sensor (probably rear but possibly fronts) but if your height is consistent when in L, N and H and everything else works fine (i.e. no AHC DTCs), I'd guess you just need a slight tweak to the height sensors. So then the question is whether your fronts are too low or your rear is too high.

The FSM doesn't provide the spec the way folks on this site like to reference it (center of wheel to fender lip).

See the FSM for the official steps to check and adjust vehicle height.

For AHC, in short, you want to get the height set correctly front and rear, then adjust neutral pressure.

Here's a brief summary:
1) on level ground, vehicle unloaded, and full tank (at least according to fsm)
2) check your height at each corner as described in the FSM to determine whether you need to raise front or lower rear. To paraphrase, you're measuring a difference b/w the center of spindle to the center of the lower control arm bolts and making sure the number you get is within a range of the FSM specification.
3) make your adjustments to the height sensor in the rear or to the height sensors in the front.
4) verify your front is level and the sensor readings are the same in the front. if not level in the front, use TBs to adjust accordingly.
5) once your height is set properly, then use procedure in the FSM to check/adjust neutral pressure.