Community Forums

TandW · 09-22-2016, 01:06 PM

Well, I see I can post replies OK. I have attempted to post a new thread twice about my P32 Anti-lock brake sensors. In a word, how many channels does the 2001 P32 employ? I see cables to the front wheels but non to the back. We had a zinginging noise that appeared suddenly, suddenly disappeared and then the Anti-lock warning came on and stays on.

tomwalt · 09-23-2016, 06:32 AM

Quote:

Originally Posted by j2inspect

Yes, a loose heat shield that rubs on something is what it sounds like but why only when moving at 35-40 mph, not a steady noise and not affected by steering, gas pedal accelaration or coasting, this is crazy!
Raspy sound seems to be coming from in front of drivers foot area down by chassis/master cylinder or front end components but that has been checked. I do have air bags inside my springs but noise not tied to bumps and also have large springs attached to leveling jacks that could make such a noise but...? We bent an engine manifold heat shield away from the exhaust just incase and I also drove with wheel covers on front removed, still no change!! Brake shoe dust shield? HELP!

I would Check the brake temps with an IR gun - that era P32 might have a caliper starting to stick (happened to me). Having an IR gun and checking rotor temps after a drive is a good habit to get in anyway.
Also look for any uneven tire wear on that front left tire or just rotate the tire. Feel the rotor for uneven/grooves/slight warp.

j2inspect · 09-24-2016, 07:49 AM

Tom, I had all the brake components replaced since the BOSCH fiasco with sticking calipers and, I roll with a tire monitoring system that reports wheel temps as well as pressure readings. My next course is to drive the RV at 40 mph with engine cover removed while a friend hovers over the engine bay to pinpoint the noise. I do appreciate your input!

j2inspect · 09-24-2016, 07:53 AM

Tand, I am not too familiar with the ABS on my 03 chassis -thankfully. I did begin to think my noise might come from the pump but been driving like this since last year and no dash warnings...

Thanks!

lonfu · 09-24-2016, 08:08 AM

I assume you have already jacked it up and checked the wheel bearings.

j2inspect · 09-25-2016, 08:06 AM

Lonfu, thanks for the input. I have replaced rear hubs and had front bearings checked last year but not recently. It is possible the driver side is binding or worn and only tells me at 40+- mph so I will check both front bearings! Also when wet not as much noise...hmmm. Will follow-up when I remedy the mystery!

Thank you, Joe

lonfu · 09-26-2016, 08:44 AM

I had these, I'll call them mud guards, in front of the tires. I noticed that they were sheets of metal that were welded to the top of the wheel well and a single brace on the bottom. I had to use some spray foam to connect them to the side wall to keep them from vibrating at certain speeds. Might check those. Also, most exhaust manifolds have some sort of heat shields attached to them, sometimes they come loose with age and miles. Some RV's have water shields too.

lonfu · 09-26-2016, 08:50 AM

Lastly, some RV's have water shields that are made from sheet metal that are mounted on the frame to prevent water from hitting the exhaust manifolds. they are just sheet metal. I had to put a couple of braces on these and tie down some of the fuel, cooling, electrical lines that were attached to them. Harmonic rattles are tough to track down, hope this helps.

okcnewbie · 09-26-2016, 09:01 AM

Can you accelerate slightly and avoid the vibration?

Torque converter?

j2inspect · 09-27-2016, 06:06 AM

Your idea about harmonic vibration with shields/guards was my first suspicion and still have not ruled out. Thing is, the vibration/raspy noise does not happen when I rev the engine (in park) at different RPM,s and when rolling shifted into neutral either! Acceleration/deceleration does not affect the noise when it is happening.
The metallic rasp is fleeting, lasting only a second or two at a time and will repeat in random succession as long as coach Winnie is moving between 35-40 mph. I can feel the slight harmonic vibration in the pedal & steering when it occurs.
I recall last season it used to occur at lower speeds and when slowing down to a stop... CRAZY!!!

j2inspect · 09-27-2016, 06:15 AM

BTW, want to clarify, when rolling at 40 mph and noise is occurring shifting into neutral does not have any effect. I am not considering the transmission. At first I thought I had some piece of road garbage caught in my wheel well but I have spent alot of time beneath the front end just looking and probing for any clue!

Thank you, still confounded! Joe

tomwalt · 09-30-2016, 10:33 AM

Joe, I just had a look at my Tiffin and it has steel plates tack welded on for heavy duty 'wheel wells'. The 3 plates are located in front of, above, and behind each front tire. If you have this, you might want to try taking a rubber hammer or 2X2 piece of wood and see if you can find a loose plate. Another (and maybe better) option would be to wedge paper/cardboard in each one to prevent/absorb vibration and take a drive.

litewave · 10-02-2016, 10:06 AM

It could be a front brake dragging slightly that could be speed subjective due to centrifugal force at different speeds. I have had this happen on my cars which turned out to be a rusted caliper. It could also happen wit a regular brake drum system if the wheel cylinder parts get rusty and sticky or retract springs and mechanism get weak and or dirty. You might be able to find the bad wheel by feeling each rim for heat after driving for awhile. The hottest rim could be the culprit. Good luck.

j2inspect · 10-03-2016, 08:27 AM

Litewave, the mystery noise sounds like it could be a brake component but not likely since that raspy noise is not affected by break pumping at all. Thought maybe the drum brake for the auto park system but if it gets any slack in return tension the dash light will tell you, besides the noise is somewhere seemingly forward of the engine.
There is a hydraulic HWH pump and a auto park system pump at the very nose but all appears to be working as it should. Thank you for suggestions!