no fuel no spark after rebuild please help

[freezing14]

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its a 99 996 , original had a big end failure , was completely rebuilt

now , no fuel no spark

check crank angle sensor, its good , or at least there is 2-3 volt on the pins when i crank

car had been of the road for about 1 year

cheched fuel pump relay , ok , fuel pump ok ,

i have read about immobilizer, door switchs , is there a way to check if its that

key fob does not unlock the doors , whats the switch in the dash with the key on it ( should light be on )

does not have scan tool!

closest dealer is 100 miles away and he is the worste for screwing up peoples, like a 300 $ for an alignment that he did not even do , so i would like to avoid him

thanks in advance

[mikefocke]

Not possible to diagnose without additional info as the history isn't clear so let me ask some questions.

Once the engine was rebuilt, did it ever work?

Were there any symptoms that were noted just before the "no spark/fuel"?

[freezing14]

never ran since rebuilt ,

and lets say worste case , no rebuilt properly , there should still be gas and sparkthere is only 2 possibility that i can think and its the CAS whcih i have checked and the immobilizer

i know the cas sensor works , i will followthe signal all the way up to the dme and if it there , it will mean immobilizer, any other tips

[freezing14]

i am at a loss

changes the crank angle sensor, still no fuel no spark
trace the wiring all the way to the dme , and its good
tested relay all around and they all seems to work
tested all fuses made sure there was voltage going to it and yes

car still cranks over

i am sure its just a stupid thing i have overlooked

what is the logic of the computer , whatv does it do , what does it check first ? anyone has any idea

any help apreciated

[j911brick]

You need a Durametric to do some testing.

[bell]

seems to be a slight language barrier so bear with me....

1.....you are checking fuel pressure at the rail yes?
2......what is it reading?
3......how are you checking for spark?
4.......by removing coil with spark plug with threads grounded.

the crankshaft position sensor is the most important sensor, at times when it fails it will not even show any codes and will not let the dme know the engine is turning, which will keep you from getting spark and fuel.

[freezing14]

here are the answer

1.....you are checking fuel pressure at the rail yes? yes , better than that the fuel line is disconnected and no fuel is comming out
2......what is it reading?
3......how are you checking for spark? new spark plug on coil pack connected and grounded
4.......by removing coil with spark plug with threads grounded

Crank anlge sensor is new and i traced the wire all the way to the DME and it reads voltage

i think i will buy a durametrics tomorrow

but i have tested most of the engine sensor with a voltmeter , they all have a ohm reading

but as far as i know there could be a lot of disconnected sensor but the car would have one or the other , why are both out ( fuel and spark)

i have also check the immobilizer under the seat for corrosion but everything is mint , check all the ground point i could find , steel brushed them all and grease them

the car used tu spew gas when the key was turned , even without the engine in the bay ( i was told by the PO)

[j911brick]

If it was a 944 I would say DME relay or CPS.

[freezing14]

996 or 944 probably the same logic

but tested the relay for the dme , fuel pump( that if i jump it pumps)

that relay as well as a few other one in there , have power all the time and they are activated by a ground signal

was told that if it was the immobilizer , it would not crank

dont want to send it to the stealeship , its gonna cost me 600$ just in towing!!!

what else then the CAS wil cut off fuel and spark?

[bell]

ok....being it's a 99 996.....
iirc....the plate the crank trigger mounts through is adjustable, meaning you can adjust how close it gets to the flywheel.
I have seen the bracket get to far away and will keep the sensor from reading properly.
have you checked this?
this sensor tells the dme to turn on spark and fuel. I am suspecting the gap is to much.

[bell]

also this thread mentions the airbag cirquit which shuts down the fuel pump if a bag deploys..
http://forums.pelicanparts.com/porsche-996-997-forum/609279-engine-wont-start-h-e-l-p.html

[freezing14]

not to doubt your expertise , but the original sensor did not have an adjustment , the pet does not show it either so i dont think it is adjustable

one question

what is the difference between the crank angle sensor and the engine speed sensor, there is 2 different one on the wiring diagram and the wires are present at the engine connector , but o dont see where they go from there

i know the crank angle sensor is located near the bell housing and reads the tooth on the back of the fly wheel ( and i do have voltage at pin 1 and 2 )

where is the engine speed sensor??? would that be the issue ,

[freezing14]

i went throught the tread and seems to have the same issue , no spark, and no fuel,

but i did not disconnect any airbag and my airbag light was never on, it is on now as i remove the dirver seat to be able to check relays under there without having a pint of blood rushing throught my head

how do you reset the dme ( airbag) without the durametric system?

[bell]

there is only one sensor for the flywheel, it monitors rpm and the firing of each cylinder through the dme.
the earlier air cooled cars use 2 sensors....
I will check tomorrow if the 996 n/a has the adjustable mounting plate, I have the factory manuals, pet, and a couple other programs I can check.
I think you're right and it doesn't have one.....

there are 2 cam position sensors but those will not keep it from firing up.

you will need durametric or the factory pwis to reset the airbag light, but only a deployed airbag scenario will trigger that, not the seat being unplugged...

I will check some things tomorrow,

did you check that the 2 large round engine harnesses on the right side of the engine didn't get mixed up? I don't believe they can be plugged into each other....but have seen stranger things...

[freezing14]

i did double check the 2 round connector and they cannot be mixed

but i found it weird that the wire at position 9 and 10 are there for the engien speed sensor thats not there( or where is it )

the wiring diagram does show 2 hall sensor , and 1 engine speed sensor

thanks for the help