Camaroron73

Below 40f crank won’t start almost does every time soon as it over 40 outside you would think I’m nuts fire right up runs incredible I’d get lucky and fired below 40 will always restart until aleast sitting 4 hours in the cold then it’s a gamble brand new battery and fuel pump oem and I resgistered battery any info would be great suspecting freezing fuel pump module maybe

seanjordan20

I don't know if anyone can will be able to understand what you are trying to say after that first line

tstiglich

Hard to follow a running sentence. Cranks/starts above 40 degrees. Cranks/no start below 40 degrees (after sitting a while). Is that correct?

Get a scanner capable of reading/clearing BMW specific codes. Start there.

Camaroron73

Yes exactly no codes in system occasionally when this happens cam sensor codes ordered both of them yesterday assume from trying to start

FormerE30Owner

Please use punctuation - commas, periods etc. - to help us understand your description. At the very least, use a Capital letter to start your next phrase. Eg. You say (I think) there are no codes, but then say the "cam sensor codes". Are you using codes as a verb or a noun in that part?. I am not trying to be pedantic or such, just trying to understand your problem.

Camaroron73

Am I in high school your correcting my gramma I’m an ase l1 master certified tech 30 years in industry very simple cranks no start only in cold weather has codes occasionally not all the time have bmw factory level scanning laptop and snap on Zeus with every option

tstiglich

I used to write the code for an engine management system: 1 cam sensor, 1 crank sensor. Without a valid cam sensor, one would not know when to initiate spark. No spark = no run.

If you replace the cam sensors and the engine will still not start, AND you continue to get cam errors, I suggest the following: When the engine is running, take note of the relationship between the cam signals and crank signal as they appear at the DME. You will need an oscilloscope. Then, compare to what is seen when the engine does not start.

If they differ, the problem lies in the sensors or wiring prior to the DME. If they are the same, and you still get cam errors, I would suspect a solder joint in the DME itself.

tstiglich

Let us know how the problem was resolved.

FormerE30Owner

If I understand correctly, if you are as qualified as you claim to be and the problem is "very simple" as you say, why ask us? At least I think that you are asking us. I am not correcting your grammar, but trying to understand your problem in spite of your poor description of the problem.

With respect. Bob P.

Camaroron73

Because I covered all the basic there always one clown in these forums always something to say but not related to the issue never said problem was simple if was I wouldn’t be here Asking for info never the less having my grammar and punctuation corrected instead of some help