Check Engine Light - Not CPS or TPS ..

Anjum · 17th October 2006, 00:58

Guys, My 1st post here, but have been posting on the BM3W board for a while now.. proud owner of a 2001 CB with Heritage leather.. in the UK

but... My Check Engine light came on after changing my MAF's (VW ones bought form the US).. Now I do not have any MAF faults, but the engine was still going into Limp mode.. (however this evening it has not -read below)

Earlier this evening I had the Codes:
170 Minumum Flow of Secondary Air
58 Sensor supply1, Master
132 DSC Message Time out
19 SECONDARY AIR PUMP RELAY
58 Sensor supply1, Master
26 IGNITION COIL, CYL 8
128 Deviation Idle Speed

The light would periodically dissapear but the car would not be responsive. It has been like this for over a week now. Every morning when i start her up she would drive well, and then after a while without any drama become sluggish again, and if the light was off, it would turn on again, and stay on for the rest of the day.... Very strange.

I just had the system reset about 4 hours ago and re-adapted all sensors, and after a very hard 140m trip (upto 150mph!!) the light came back on whilst cruising at 80 and slowing down to about 60mph.. but this time had no difference to the performance, and the car still pulled like crazy (as it should). I have not checked the codes again, and will do tomorrow..

Over the last week or so there have never been any CPS or TPS codes.. But after changing the MAF's I did on 2 occassions get additional Vanos and fuel supply errors, which are not there any more (after 2 resets)!

I have searched through the threads in hope of finding a similar problem but have not been sucessful.. any ideas out there would be very welcome!.. Could it be CPS's that need replacing? if it were the CPS's they would throw a fault for sure?? My bro has an M5 as well identical, and his does not sound or go like mine.. his just seems more civilised.. my exhaust sounds alot noiser than his.. although they are the same..

Otherwise a truely awesome car ! with an eye out for easy to clean 19's!!

Anj

pantony · 17th October 2006, 01:22

My m5 SES light came on with the fault codes 105 & 232 recently. Still working to resolve this issue. This happend after the car stalled (low on fuel). The car was parked for 2 days at a slope (sideways) with low fuel. Although the gauge was well 1/4 inch above the empty line and the range was about 39 miles. This has never happend before. A total of 8 fault codes showed up and 6 of them were directly related to the low fuel. But 105 and 232 wouldn't go away.

105 - engine coolant temperature plausibility
232 - Evaporative emissions, purge valve functional check

They tried changing the engine temperature sensor, and that didn't do a thing. The next option is to check and change the fuel tank breather valve for the code 232. That's goin' to cost around $500. Again they're not sure about the 105. They will try to change another temperature sensor valve.
Sort of trial and error. Someone else on the boad were discussing about checking carbon deposits on the sec. air modules, and related. That will end up costing around 8K or so, because they've to take the whole engine apart.
That's not a feasible option.
My whole confusion is that, just by running low on fuel once, how many goddamn things can go wrong!!!. It's unbelievable for a machine like the m5. And it pisses me off, as this trial and error stuff only drains my wallet. At the end there will be new parts and valves on my m5 that may not even be reqd in the first place.

My advise: Never let your M5 run low on fuel. When I mean low, it means even at 2 or 2.5 gallons (about 50 miles range). The service advisors say that the range sensor is not that accurate and due to various things you can still run low on fuel closer to 50 miles range. I'm learning the lesson the hard way. So never run your fuel below 50range range. It's best to fill up fuel as soon as it's around 1/4 tank.

Anjum · 17th October 2006, 01:27

Running Low on fuel.. does all that.. Damn.. I'm sure many have gone down that road.. I'll keep that in mind, and hope it all works out with your car!..

Does ur car still run poor? or just the light on the dash ?

pantony · 21st November 2006, 02:33

Quote:

Originally Posted by Anjum

Running Low on fuel.. does all that.. Damn.. I'm sure many have gone down that road.. I'll keep that in mind, and hope it all works out with your car!..

Does ur car still run poor? or just the light on the dash ?

I first took the car to Dinan, Mountain view, and they said, they'd change the temperature sensor (about $100) to begin with for code 105. 1 week later , same problem. Again I got 2nd, 3rd opinions from 2 other service centers, including the bmw dealership at mountain view. They, all swore that changing the thermostat would fix everything. So I went back to Dinan and they changed the thermostat for parts + labor about $600. I waited for couple weeks, drove around ,and then I started getting engine multiple cylinder misfire codes (199, 200,201) and the old codes 105 and 232. I started loosing power occasinoally at high rpms (between 5 and 6000 rpm) in 3rd gear. Then I lost my patience and told them I was tired of the trial and error method. They did some DME software upgrades and replaced my battery (as it was old, and the voltage was also low). Drove aroudn for a day and again, the old code 232 reappeared today. Along with that code 208 (Misfire During Warmup Cyl #4). That was weird, as the light came on when I was already driving on the freeway. The engine was already hot enough.
So again, back to Dinan tomorrow. Everyone , including dinan don't have any proper clue on what exactly is going on. They're just goin' by the books. I wish I kept my car stock. Atleast it's simpler to diagnose. Otherwise the dealer blames Dinan, and so on and so forth. I'm so fed up and sick of this.

chrisj · 21st November 2006, 03:00

The engine coolant temperature plausibility code is thrown all the time. My car threw it when the CPS code was thrown. After replacing the CPS, I have never seen the coolant temp code again.

If you are seeing it, but your car is not overheating, it most likely is a dead end. Do a search about code readers and I think you will find most owners reporting it when they also see other problems. I can't recall a post where that code was actually indicative of overheat / thermostat / etc.

I would definitely search the board as they already have you many $$$ in for something that, IMHO, is a red herring. I mean, if your car was overheating to the point you were losing power and having noticeable issues, I would think you would notice it was hot.

Not to mention, you have an established point in time and a low fuel condition that created the original issue. So you ran so low on fuel the car threw codes, and one of them that remained has to do with the fuel system. Seems like that is the first place to look, not the last. Questioning the dealer - not you by any means -

Am I missing something?

Anjum · 21st November 2006, 09:40

all my codes went after changing the CPS.. it never even cam up as a fault until BMW pulled the Codes up for me.. HAve not looked back since! We could have tried the trial and error replace everything till it works.. but fortunately the code did show up eventually!

Anj