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[V8Cowboy]

Helly guys,

I'm desperate right now. I came home on friday, put the car in the harage, everything fine. Yesterday evening it just wouldn't start.
It is turning, you smell the gas, but it just won't come to life. No fault code stored, no flashing of the MIL.
After checking some fuses in the engine bay by removing them one at a time I somehow seem to have confused the system, suddenly the immobilizer put fault codes, flashing MIL, recognizing different keys though.

I called the automobile Club and at least the guy could solve the immobilizer issue... simply by cutting off battery for a few minutes. The main problem persisted. No spark on all 6 plugs. Tried another coil - the same. Coils have ignition line and ground, but don't seem to be feeded by the ECU. You can Access it and read fault codes, measure data and so on.

I'm not sure if I can suspect the crank sensor, the guy from the club said he sees an rpm signal. Some years ago I already replaced it, but the symptoms then were stalling when warm, no problem at all starting cold.

I had to leave the car at home for this week and don't really know where to look. Should I buy a new crank sensor just for fun and try it? Had anyone of you a similar problem and perhaps a solution?

I really really appreciate any input and help, my weekend so far is a catastrophy anyway, besides this trouble.

Thank you!
All the best, Kristof

[BazaJT]

I'd still go with crank sensor,if nothing else you'll at least then have a spare.I've never had a 3.2 so I don't know if they suffer any issues specific to that engine.Others will be along with better advice soon I'm sure.

[Lazydocker]

Sounds like crank sensor to me too

[V8Cowboy]

Thank you for your replies.

I was just wondering, if a failing crank sensor shouldn't block the fuel pump too?

[05omegav6]

Thank you for your replies.

I was just wondering, if a failing crank sensor shouldn't block the fuel pump too?

Fuel pump runs to prime on ignition switch on, then cuts pump until engine fires...

[V8Cowboy]

So fuel pump runs anyway when turning the ignition on, no matter if crank sensor works or not, did I understand it right?
The engine should get just enough gas to cough IF sparks where working.

Hmmm... I ordered a new crank sensor (and cam sensor as well  as it was only a few Euros more, who knows...good to have one on spare) and I hope it arrives in time on friday at the latest. Changing it is not that hard and at least another factor to be ticked off.
I'm still curious, as the guy said he gets a rpm signal, anyway strange. From one day to another...

[K_V6]

If there are no gas, may be injection relay??

[V8Cowboy]

No no, gas is there, enough to fill the whole garage after a few starts, it's definitely the sparks that are missing.

[K_V6]

Ok, so is possible the crank sensor

[V8Cowboy]

Hello guys,

just to give you a little feedback. It indeed was the crank sensor. I was sceptical, but you proved me wrong. After measuring infinite ohms on the plug it was clear even to me. Runs again And again I could learn something! 

Thank you all for your advice and please forgive the typing Errors I made  Didn't find any button to edit it later.

Have a nice evening!

Kristof

[BazaJT]

Glad you're sorted

[sjc]

Was the previous one a genuine GM crank sensor or a pattern one?  And what about the replacement, GM or pattern?

[V8Cowboy]

Hi,

sorry sjc, I somehow didn't get a notification or failed to recognize it.
Both sensors, the one I replaced back in 2008 and now, are Bosch sensors. I was taught not to use any cheap aftermarket brands on the Omega, as this would most likely result in buying it twice

Anyway, being happy the car started again I drove it a few days ago the first time. After maybe half a km I got the MIL lighting up, together with losing power. I stopped and blinked out P0325 knock sensor 1. Ok, it was late, I had to drive, car drove somehow, let's try it. After another 8 km or so the MIL suddenly disappeared. Car ran fine again. Since then, I get the MIL every day, but only for a few seconds. Car runs fine with full power though.

As I understand the fault code, P0300 -306 are for actual misfire the knock sensors register, while P0325 is a knock sensor malfunction itself? I was not able to check wiring right now, hope to do this tomorrow evening. I was just wondering, as this came once again very suddenly, if this can be somehow related to the crank sensor issue, or maybe because the mechanic unplugged coil pack 1 for testing? And did not snap it in correctly?

[Shackeng]

 I think that unless you use a genuine GM OE crank sensor, you can never be 100% certain of its reliability, and even then they fail. Many of us carry a spare GM crank sensor in the boot.

[terry paget]

Thank you for your replies.

I was just wondering, if a failing crank sensor shouldn't block the fuel pump too?

Fuel pump runs to prime on ignition switch on, then cuts pump until engine fires...

I'm sure you're right Al, but somewhere I got the impression that fuel pump operates, ignition on, when either the starter is cranking or the engine is turning at 400rpm or more, as advised by the crank sensor. This tallies with the OP stating that he had plenty of gas, after a few cranks the garage stank of it. Please explain to me how pump knows when engine is primed.