[matomorizo]

Hey guys,

I really need your help to get my '85 911 3.2 running again. It is a US model which I brought back to Germany 5 years ago.

So, far it ran perfectly. No Problem, never. but then this winter came.

After winter it wouldn't start anymore. Battery is fine, it crankes, but just won't start.

The crazy thing is that it ran about a day after using some starter spray. Then it stood for a day and again wouldn't start anymore, also not with the spray.

So, the work began:

This is what we have lready checked thanks to this fabulous forum (checklist) as well as Bentleys Manual.

- all sensors regarding ignition and fuel injection,, ignition System (coil, rotator, distributor, cap, etc), fuel supply, fuel pump, DME, spark plugs exchanged, injectors cleaned, and all sensors described to check in Bentleys
- fuel injection and ingnition working properly (fuel and spark is fine)
- opened the ECM, Looks fine

Now, we realized something:

There seems to be something about the air flow sensor, MAF:

- When the MAF is detached, the car starts, however runs poorly, so we deinstalled the MAF and opened it.

No Problem to see, except only one thing is strange: The Potentiometer has a slight interruption (it jumps from 0,5 kOhm to 0,8 kOhm and then it continues not regularly (0,7 ... 0,9 ... 1,0 ... 0,8 ... kOhm), as it should be (according to Bentley)). Is that really a sign for a faulty MAF?

So, we think that either the MAF is the Problem (if that Ohm values are the Problem) or the ECM does something wrong with the values it gets from the MAF.

What do you think? Could the MAF be the Problem? Any idea how to be sure about it?

I never read about a failure of MAF or Problems with it so far. Also, I could not Imagine how it broke from Standing.

- Is there another way to check the ECM/MAF except exchanging it? Do we miss or oversee something here? maybe a vacuum leakage? So, far nothing found.

Again, the strange thing is that it ran after giving it some help. I made a 1h ride, stopped, started again, everything fine. Then, 2 days later after Standing - Nothing.... it crankes, and crankes but doesn't want to start.


I did not find a solution to that Problem yet in the forum, but if you find something, let me know, please.

Thank you in advance for your help! A Garage would be the ultima Ratio... as it should be.


Best wishes from rainy Germany,

Mato