Inspection 1

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Tom, have you taken your car in for the Inspection 1 service? My car goes in tomorrow morning and I believe they are going to do this inspection.

I am also going to have them check the Tire Monitoring Sensors and for a grinding in the rear end area. This is the second time. The last time they never could find the problem with it, but it has gotten worst.

For the Tire Monitor Sensors I seem to have a slow leak in the rear passenger tire. The sensor is supposed to detect variables of +-2-3 lbs. of air difference in pressure. When it detects this loss it is suppose to trigger an amber warming light. I never get this light. Instead I get a red warning light that is suppose to warn of a critical flat tire. My monitoring sensors only activate once it is down about 10 lbs. of pressure loss. Then it triggers the red warning light. Each time I think I have a flat and pull over only to find it is just low on air. I air the tire up and reset the sensor, but it happens this way each time. Either the sensor is dirty or it is bad. I will have them check it.

The grinding noise has been ongoing. The last time I took in for the rod bearings I mentioned this and had them take a look. They could not replicate the noise; hence they could not fix this problem. They did change the rear differential fluid and explained to keep an eye out for it. Since then it has become worst. A low speeds it is very noticeable (albeit the noise is not there all the time) and seems to go away at times. It could be a rock behind the break shield, a bad differential, or something else. There has been a known issue with some E46' rear ends. I talked to the dealer about this and they stated it is very very rare for the rear end to go bad. They stated they have only had one rear end change out at that dealer. I want them to check it thoroughly. It is pretty embarrassing to have the grinding sound (you can hear it very noticeably) while driving down the road, parking lots, or just backing out of the driveway. We'll see how it goes.

P.S. I will be posting picture of the M Night I attended on the 29th of Jan. There will be many pics. of all M cars. Eric Wensberg attended and spoke. For those who don’t know of him, he is the major reason that we here in America have the M cars. After the E30 M3, BMW was not going to import the M to America. He banded with many of the BMW club presidents and went to BMW and was very instrumental on getting BMW to bring the E36 M over. His main stance was to bring it over with less HP and lower cost. This was his main bargaining tool. He preached that Americans would jump on a car like this. The rest is history. Also, he was very very involved in BMW motor racing. He has been very influential with BMW in America. He was on the cover on Jan. (I think is the one) cover of Zündfolge, which I have signed BTW.
 

Big Daddy

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#2
Hey where is my signed copy? I had a grinding noise issue with the roadster a while back and found a small stone lodged in the caliper. I had to use a screwdriver to pry it out. It would quit grinding if I turned the wheel sharply and baffled me for a day or so. I hope that is all it is. By the way how was the chapter dinner?
 
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Big Daddy said:
Hey where is my signed copy? I had a grinding noise issue with the roadster a while back and found a small stone lodged in the caliper. I had to use a screwdriver to pry it out. It would quit grinding if I turned the wheel sharply and baffled me for a day or so. I hope that is all it is. By the way how was the chapter dinner?
I am hoping this is all it is too. I really don't think it is something major. i can touch the rotor and it does not seem pitted, but I want to make sure. I have not had to time to pull the wheel off myself.

The dinner was outstanding Dan. We raised over $15,000 dollars for Parkinson's Research Foundation. It was amazing. Eric was to only speak for 30-45 min., but he ended up talking for almost 2 hours. He had some great great stories. He has a wealth of BMW knowledge.
 
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#4
Does the gringing noise sound like metal dragging against your rotor?

I had the grinding noise and it was a combination of 2 things:
1 - Dealership over adjusted my e-brake
2 - The dust shield was rubing against the rotor

If this sounds like your situation, you can try going under the car and gently pulling the dust shield away from the rotor.

Like you, the 1st time I mentioned the problem to the dealership they said they couldn't replicate the noise. Finally, I got my hands a little dirty and took care of it.
 

Tom

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#5
I had my inspection one completed nearly two years ago Scott [:D].

I haven't experienced any grinding noise so I'm not sure what is exactly happening in your case. Hope it gets resolved and keep us posted.
 
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Well got the car back. They thought this was the Inspection 1, but realized it has already been done. This was just an oil service.

They finally found the culprit to my grinding noise. It was a defective backing plate. He stated that on the early models this was a design flaw. Not all cars will have this problem though. They have changed the design on current models. Good news is they had to replace the wheel bearing too so now I don't have to worry about that wheel (crossing fingers). This was also the cause of the rattling sound coming from that area when I hit a pot hole etc... This was of course free of charge. Jeez, I love that sound; free-of-charge.

There was supposedly nothing wrong with the wheel sensor. He said, because it is not actually sensing the pressure in the tire just the wheel speed that the sensor will not always detect a loss +- 3 Lbs. and that is why it kicks in with about 10 Lbs. Loss of pressure. I am not sure what to believe. He said it looked good. I received my info from the owner’s manual. I will see how it works out. The car seems to drive very well. I am keeping and eye on the rear though.
 
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Glad they fixed the annoying noise problem. As for your tire monitor sensors, I think you might just have to let it go. All the car copmanies that use this system constantly have problems up the ass. I know for 04, Infiniti gave the G35C the TPMS standard and people on G35Driver were constantly having problems with them. When my parents took delivery of their S500's, my mom's S500 TPMS worked flawlessly and my dad's S500 TPMS just didn't work at all. One time my mom dropped her car for its first service and the dealership called us back saying they had to replace one of the tires because there was a nail in it. I asked mom if the TPMS ever told her anything, and she said it would randomly give her the warning and then it would go away, but every time I used her car and checked tire pressures, everything was normal (32psi all around, as it should be).

These tire pressure monitoring systems are just insanely finicky and never really work right. I hope they work the problems out over time!
 
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#8
Emile, I can't believe that these companies are having so much trouble with tire pressure monitoring systems. The systems in the GM vehicles that I have had experience with don't have any of those kinds of problems. The monitoring system in my parents' Impala seems to work great - it has never given us an errant warning, and it correctly showed low tire pressure when one of the front tires went about 5 psi low. The low tire pressure light in my fiancee's 1997 Grand Prix GTP also hasn't had any errant problems. I can't believe that GM can get it right but these other companies can't.

Scott, I agree with the service rep - if everything checked out ok, then I wouldn't really worry about it. Since the system uses the ABS wheel speed sensors to detect differences in wheelspeed due to differences in tire pressure, I find it hard to believe that the system could be sensitive enough to detect a +/- 3 psi difference. 10 or maybe 5 psi, yes, but 3 or less psi seems like it wouldn't produce a great enough change in rolling resistance of the wheel for the ABS computer to pick up on.
 
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jrt67ss350 said:
Emile, I can't believe that these companies are having so much trouble with tire pressure monitoring systems. The systems in the GM vehicles that I have had experience with don't have any of those kinds of problems. The monitoring system in my parents' Impala seems to work great - it has never given us an errant warning, and it correctly showed low tire pressure when one of the front tires went about 5 psi low. The low tire pressure light in my fiancee's 1997 Grand Prix GTP also hasn't had any errant problems. I can't believe that GM can get it right but these other companies can't.

Scott, I agree with the service rep - if everything checked out ok, then I wouldn't really worry about it. Since the system uses the ABS wheel speed sensors to detect differences in wheelspeed due to differences in tire pressure, I find it hard to believe that the system could be sensitive enough to detect a +/- 3 psi difference. 10 or maybe 5 psi, yes, but 3 or less psi seems like it wouldn't produce a great enough change in rolling resistance of the wheel for the ABS computer to pick up on.
I agree, I was just quoting them what is in my owners manual of how the sensor is suppose to work and wanted them to check it out. The sensor does work. It just usually goes straight to RED (meaning the tire is suppose to be flat) instead of YELLLOW (when it is suppose to detect +- 2-3 Lbs. difference) meaning low tire. I am not worried at all. The thing helps me out when the tire is low and that is all that really matters.

I have a slow leak in my rear passenger tire that I need to get fixed. It is a very slow leak, but I don't anything to happen at high speeds. Sucks, because these are relatively new tires. There are only like 7k on them. I will fix and at some point replace them all. I don't usually travel at high speeds anyway at this time anyway. I am keeping a lookout though. It could resolve itself from just taking the tire off and putting back on. Stranger things have happened.....
 
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jrt, that's definitely good that GM seems to not have any problems with the TPMS on their cars. I'd say the problems with the TPMS on other cars is that it occurs once or twice and once the problem is resolved, the system doesn't give you a hard time anymore. As I said before, my dad's car came to him with the TPMS not functioning. He took it in to get it fixed and 16K miles later, it hasn't had a single hiccup. Of course there are those few people where the TPMS gives them the same problem(s) over and over until finally the dealership just disables the whole system on the car !!

M Speed, I have heard and read that the TPMS on whatever car usually will give you a warning when tire pressures are different by + or - 3psi from each other. But I can tell you that my parents are pretty bad at maintaining their vehicles' tire pressures and sometimes when I check the display, one tire will have 27psi and another will have 31 or 33psi and it will just not give me any kind of warning. I use the menu to find out the tire pressures myself. What I am trying to say is that you are FAR from alone on this one.
 
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MrElussive said:
M Speed, I have heard and read that the TPMS on whatever car usually will give you a warning when tire pressures are different by + or - 3psi from each other. But I can tell you that my parents are pretty bad at maintaining their vehicles' tire pressures and sometimes when I check the display, one tire will have 27psi and another will have 31 or 33psi and it will just not give me any kind of warning. I use the menu to find out the tire pressures myself. What I am trying to say is that you are FAR from alone on this one.
Yup, I am just happy it works. It really is a nice feature, especially when you don't drive the car all the time....
 
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///M SPEED said:
Yup, I am just happy it works. It really is a nice feature, especially when you don't drive the car all the time....
I agree, it is a very cool (and VERY useful!) feature to have. It's really awesome how it works, too IMO - a very elegant system that uses technology already in the car to create a new very useful function.

I had a very slow leak in one of my tires last year. It would run about 5 psi low every 4 weeks or so. I finally took it to a local tire shop, and they had a lot of trouble finding the leak. They did eventually find it after hyper-pressurizing the tire, and it looked like it was a defect in the rubber deep within one of the tread grooves. Shortly thereafter I bought a new set of tires. Within a week of getting my new tires, I noticed a nail in one of my rear tires while putting gas in the car. Man was I pissed!
 
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jrt67ss350 said:
Shortly thereafter I bought a new set of tires. Within a week of getting my new tires, I noticed a nail in one of my rear tires while putting gas in the car. Man was I pissed!
That is exactly what happened to me. The tire only had about 200 miles on it when I got a screw in it. That was the driver side (had it patched to my chagrin) , now it is the passenger side that has a slow leak. I haven't seen the culprit of this one. It sucks big time. The tire is a ContiSport 255/35/ZR18. Not a very cheap tire and I really should replace two being propensity to want to drive fast at times with this car. It always seems to be something. No biggy I'll just have to purchase some in the future...
 
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#15
The quality of the TPM is purely software dependent, and we all know that BMW has had its software issues!

The theory is quite simple: compare the ABS sensor pulse frequency from all four sensors. If one is faster than the others, that tire is low. But in realty it is much more complex, because front tires will turn faster/slower when turning, braking, etc. If two tires are low, it gets more challenging. Sounds like GM has it figured out, BMW is still trying.
 


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