robflying

I tried posting this in the reg 996 section but since I guess its a turbo engine, I didn't get any responce. And here we go New at least new to me engine install on to my 996 project. Here whats been checked. fuel pump relay gives momentery boost, whle engine is cranking fuel pump relay is latching. Checked for fuel at the fuel rail and its present. Checked for spark and there is. Also checked for power to the injectors and its there, I know the dme controls ground and that since I still don't have durametric hasn't been verified.
I do have a airbag failure light, but I'm told it should still run if the fuel pump is latching. But of course no vrooom. I'm also told to change the crank position sensor, but if it was really bad the fuel pump would not latch correct? What say anyone!!

32krazy!

did you reattach the ground cable on the pass side of the engine to the body?

robflying

Yes it has been reconnected. At first not, and then I noticed that the throttle wasn't responding. Thats when I noticed the engine main ground disconnected.

robflying

I'm suspecting fuel pressure being low or not to spec. From my understanding if pressure is low the injectors will not pop open. Unless its something else
. Hope others have seen such problem and can offer advise.

993GT

crank sensor would make sense... but are you getting consistent spark?
why not get someone to spray (pick your favourite ignitable) fuel down the throttle body while you're cranking and see if she barks..

993GT

is this a remove and replace engine on a 996tt or a transplant job?

robflying

I've sprayed ether and it does gives indication of starting, but of course no dice. Yes spark was checked and its present. Oh yes a transplant with all bell and whistles to boot.

Kevin

What ECU are you using? Part number? ECU, Gauge cluster, immobilizer, alarm module and keys all from one car?

robflying

ECU, gauge, immobilizer, key interogator ,and key all from a turbo car I was told that that's the way it had to be done, so it was. I know the ecu P/N 996-618-606-01. ECU Doctors in Florida said they would check every thing for me if I wish, but from our discussions that I had with them. They said its the car. If it sparks, fuel relay latch while cranking, then it should start, but of course it doesen't. The only thing I haven't been able to verified is control ground from the DME to the injectors, I verified power to then tho.

993GT

yup was going to say immobilizer issue
IIRC, immobilizer will allow 2 rounds of spark before cut off

Carlo_Carrera

Are they all from the same car? All those components have to be from the exact same car for them to be able to communicate/function.

If they are not from the same car the system needs to be reprogrammed at a dealer or shop that has the proper diagnostic computers.

robflying

Yes they are all from the same car. And acconding to ECU Doctors if it was the immobilizer it would no crank over, which it does and so does the fuel pump relay. They say the immobilier cancels the start relay from latching. Thats why they are saying the issue is the car not the electronic communicating and controlling systems.

Kevin

The following:

Do you have any CEL's?
Have you measured 3.8bars of fuel pressure at the rails? Do you have fuel going back thru the return line?
Have you done a leakdown test on your engine?
Do you have a PIWIS?

robflying

No PIWIS I'm waiting for my durametric cable to arrive, I do have fuel on the return line did verified that. Have not mesured fuel pressure yet. I'm told from others I've spoken to, that it's where my problem my lie. Leak down test, haven't done either because the plugs are very clean no oil trace, and you can feel compression while turning the engine. Even with that lets say its low it should still turn on might run like crap but it should run. Do you not agree?

32krazy!

are all of the electronics coded to your car? dme immobilizer etc all need to have your turbo vin