Stalling

[Tiger]

A good drive will tell you if you solved the problem or not.. CPS is a tricky thing to test regardless of how the manual tells you so. In BMW, it is very very very common to go bad. in older MB of same era or older... not common at all. The new MB has CPS problem at higher mileage... typical symptom will be engine dying when engine is hot... pretty consistent to temperature. In winter... not so much.

Other thing with CPS is that you might notice the engine is running hotter with faulty but functioning CPS. After change, the engine runs cooler. This is observed on my friend's MB.

[shogun]

and check the fusible link(s) for haircracks
BMW E34 Website

fuseable link location pic


my E32 750 has 2 fusible links, not sure how many your model has.

[Tiger]

So Ferrett 1962... what is the verdict?

[Ferrett 1962]

Still waiting for the part, $200 to buy here and even the dealer said it was on back order got it from UK for $37 incl post just waiting for it to get here.

[Ferrett 1962]

OK so the new part arrived and installed car started fast and seemed to pull better but now cutting out, idle fine then almost stop then jump back to normal. I replaced the CPS and the car started fine, drove around the block and all seemed well untill the car cut out and ran fine again so I headed to the driveway and let it idle and it stopped again, waited five minutes and it started at 700rpm ran for a while and slowly dropped to about 500 to 600 rpm almost stalled and reset to 700 rpm for a while. so I held the throttle about 2000 rpm and the car seemed to do ok but again almost stalled and jumped to 2000 rpm. This is ongoing, the car seems to run well but will not rev above 3000rpm and continues to almost stall and then rev until cutting out, I removed the maf connection and the car revs dropped for a second then acted like before with reving then cutting out them reving again. Strange situation even with a lot of heat the car seemed to run but not right, I have not reset the system by removing the battery for a while so could that help or any other ideas?

[Tiger]

Mmm... sounds familiar... let's see if others knows the answer.

Sounds like a plugged cat converter to me... but I may be wrong. It may also be a bad CPS... what brand is it? What is the resistance?

I'd reset the computer just to have it recalibrate the engine.

[Tiger]

Just remembered something similar to this... it was the position of the crankshaft position sensor... make sure it is absolutely tight!

And check the clearance between the sensor and the cogs.

[632 Regal]

Not much adjusting to do, they pretty much bolt in and thats it. I'm old school and still betting on fuel delivery issues, gunk in the tank or something if the filter seemed to be clogged and that helped.

Another thing that would seem similar is a weak ignition, same symptoms as lack of fuel. Plugs/wires/cap/rotor all good? Check that aspect so you can wipe the board of the issue. This is as stupid as my 850 not starting after driving it into the garage.

[Ferrett 1962]

So after last night tried to start today and started ran for a bit and stopped and would not go, I pulled the negative off the battery for 30 min or so and it started again for a short time and stopped now just no go at all, checked new sensor and and got 703 so it seems it might be a dud, refitted old sonsor but still no start will crank over just not start it seems whatever was failing has gone I am starting to think it might be the fuel pump so I will start checks on that starting with the relay. I will not be beaten by this I will find and fix the problem, no more parts, I did not mind the couple of things I changed but no more without a lot of tests. I can't get to a place that can read codes so I will do it the old way check and check, mine is a 95 with seperate coil packs and I don't see all them going at once so if it is spark it must be the triger that makes them work is the problem but for now research forum for fuel pump and go from there.

[632 Regal]

The word is anything but the expensive sensors (CPS) at the dealer are junk. you can buy 4 and 3 will not work, so do think of that angle. Just cause you got new dont mean they work is what I have read.

Run a small wire from the pump up to your volt meter where you can see it to count that out. Stupid **** always catches me off guard.