Crank no start the ever not so popular subject.
03-04-2019, 12:46 PM
#47
As I remember the 996 only has a 58 tooth or 60 minus 2 reluctor wheel, and I think it’s the same for the 997 , but not 100% but as with any aftermarket part the margin for error is usually higher than the OEM. When I do a project like this I certainly like to take the unknown problems out of the equation, or questions like this seem to come out. There are lots of variable possibilities of the cause, usually it’s a simple one, but finding it is the hard part. You definitely need the scan tool for further info.
03-04-2019, 03:47 PM
#48
Originally Posted by cdk4219
As I remember the 996 only has a 58 tooth or 60 minus 2 reluctor wheel, and I think it’s the same for the 997 , but not 100% but as with any aftermarket part the margin for error is usually higher than the OEM. When I do a project like this I certainly like to take the unknown problems out of the equation, or questions like this seem to come out. There are lots of variable possibilities of the cause, usually it’s a simple one, but finding it is the hard part. You definitely need the scan tool for further info.
03-13-2019, 03:07 PM
#49
That's what I was told that the count is the same for the models. Now that location was different don't know if it was the 993 or 964. That the position sensor was also place different.
On another note, talking to a local supposed Porsche tech. He says look closely at the grounds, he mentions that if its cranking, and fuel pump relay latches during the cranking portion, and I've checked to make sure injectors are getting the signal then per him that the DME is doing its job. But if the ground is weak that it would lead to weak or dirty signal causing poor operation to not operating at all. He asked if I had an oscilloscope, that it would show if the signal was strong or on the weak side. I guess that makes sense. I pulled codes and no DME codes show. I'm getting the usual code 47, and 60 from the alarm, but I have't read anyone having a starting issue with these codes.
On another note, talking to a local supposed Porsche tech. He says look closely at the grounds, he mentions that if its cranking, and fuel pump relay latches during the cranking portion, and I've checked to make sure injectors are getting the signal then per him that the DME is doing its job. But if the ground is weak that it would lead to weak or dirty signal causing poor operation to not operating at all. He asked if I had an oscilloscope, that it would show if the signal was strong or on the weak side. I guess that makes sense. I pulled codes and no DME codes show. I'm getting the usual code 47, and 60 from the alarm, but I have't read anyone having a starting issue with these codes.
03-13-2019, 06:00 PM
#51
Well at this point anything is possible from the looks of it. I'm sworn by the ECU repair shops that its impossible for the immobilizer to be it cause the engine is turning over and fuel pump relay latching while cranking, And yes fuel pressure its been verified. But I'm all at a lost. Wish I could find someone that's had the same issue in the exact same manner that will point they way to repairing this. I don't like shotgunning anything, I always try to approach things with logic but in this case it isn't happening.
03-13-2019, 06:35 PM
#52
Well at this point anything is possible from the looks of it. I'm sworn by the ECU repair shops that its impossible for the immobilizer to be it cause the engine is turning over and fuel pump relay latching while cranking, And yes fuel pressure its been verified. But I'm all at a lost. Wish I could find someone that's had the same issue in the exact same manner that will point they way to repairing this. I don't like shotgunning anything, I always try to approach things with logic but in this case it isn't happening.
03-13-2019, 07:45 PM
#53
RL Community Team
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I always thought it was the immobilizer and still do.
03-15-2019, 05:34 PM
#54
Up date had the supposed Porsche guy take a quick look. Again checked spark its there, checked fuel with plug off you can smell and see the mist in the cylinder. I asked him if its the immobilizer even he says no. He says it wouldn't crank nor spark or fuel. Then he said you bought this engine used I said yes, Why? timing might have been jacked with tho no indication of tampering by the looks of it. He says timing need to be ruled out. Like he said if no spark or fuel that it electronics but not when its can be verified. Now the question can this bee done with the engine installed. He says he has never done it in such a manner.
03-15-2019, 06:18 PM
#55
Drifting
Up date had the supposed Porsche guy take a quick look. Again checked spark its there, checked fuel with plug off you can smell and see the mist in the cylinder. I asked him if its the immobilizer even he says no. He says it wouldn't crank nor spark or fuel. Then he said you bought this engine used I said yes, Why? timing might have been jacked with tho no indication of tampering by the looks of it. He says timing need to be ruled out. Like he said if no spark or fuel that it electronics but not when its can be verified. Now the question can this bee done with the engine installed. He says he has never done it in such a manner.
03-15-2019, 06:21 PM
#56
RL Community Team
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And if timing was the case like that, at 9.4:1 CR, wouldn't you hear the valves tagging the tops of the pistons?
03-15-2019, 06:34 PM
#57
Drifting
03-15-2019, 07:49 PM
#58
RL Community Team
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Did this "Porsche guy" plug it into a Porsche factory computer and check to see all the modules were communicating with the ECU?
03-15-2019, 09:05 PM
#60
In earlier posting I mentioned that it will spit and sputter with ether and I did asking why with ether. He says ether is hotter and he thinks its pre ignition. Compression is good so the valves should be ok. When I told him about the aftermarket flywheel he suspecting that"s were the fix will be. AS he puts it thats the only difference in the engine.