Hello,

im just about to freak out with my problem.

​​​​​I rebuild a 2005 Corvette C6 LS2 Manual where the engine was in pieces in the trunk cause of camshaft bolts that came lose, chain broke and the valves kissed two pistons - i rebuild the whole engine already and installed it in the car.
I fitted everything back together and wanted to start it for the first time but it only cranks and i have no spark.
I have rebuild several cars and vettes in the past.
I only have the p0336-00 code in the pcm.
Crank sensor is also new from ntk and its a black one for 2005 modell like mine also cam sensor is a new one from gm.

I checked the following already:
- all ground spots cleaned and tight
- the 3 ground spots on the engine also
- i also have ground to the main coil connector
- all 3 wires from crank sensor to ecu
- i have 12volt on crank sensor
- i have fuel pressure and the pump primes
- i disassembled fhe fuse box and checked everything already
- all relays in the under hood fuse box are good
- all fuses are good
- reluctor wheel is good on crank
- its the right crank sensor for that reluctor wheel
​​​​​

I cant figure out what could be the problem.
I ordered a new original gm crank sensor that should arrive the next few days to check.

I only can read rpms from the crank sensor with my obd tester und during start it shows a few times about 200rpm dont know if thats on the range where it should be?

Could one of the following reasons be the problem or cause a no spark issue:
- i havent installed seats yet
- i havent fitted front wheel speed sensors
- i havent fitted the front electric fan
- the under pressure system isnt attaches yet
- belts are not installed yet
- hood isnt installed yet


Maybe some of you have any more ideas what if could be?


Thank you very much for your help!




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If you have injector control but no spark it’s not a crank sensor…did you check the coil pack grounds ??…I think on your car it is G107 on the right rear of engine….do you have a test light and know how to use it ??

 

Thanks for your answer @C5 Diag

I have a fault code p336 crank sensor in fhe pcm
I surely checked g107 and getting ground connection to the coil pack connectors.

​​​​​I took the Multimeter to measure continuity on coil connector plug to ground on engine and it "beeped"

How would you recomend testing g107 any further?
I can buy a test light for sure

Regards

 

Continuity is not the best method to check grounds…I use headlight bulbs of different wattages to test.

 

G107 is the ground for the coils, but it is located on driver's side of the block between the head and the oil filter. It is sometimes overlooked when a motor is replaced.

G105 on the front of the motor under the PS pump is another one that is frequently missed.

 

@wjnjr They are all in place and tight.
Only thing i could remember is that the g107 was damaged - the connector was broken off and i resoldered a new one i will double check that but there must me at least contact cause of the continuity test.

@C5 Diag i buy a testlight today and test it again.

Maybe someone has a diagram where i can see where the g107 goes from block to the ignition coil plug (what exact cables on the connector should get the g107 ground)? I only can find diagram where it says that g107 goes to the coils but nor what exactly cable or pin on the connector plug?
I can check with continuity but just to be clear that its only one cable per connector?
Thank you very much for the help.

Regards

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My Alldata for your 05 shows coil pack wiring below…G107 location may be wrong unless someone with an 05 can verify !!

 

Yeah, good point. '05s have some unique features and parts not found in other c6s. The shop manual picture I posted is from the '09 manual because I could not find a similar diagram in the '05 digital manual. So it may not be accurate. And aftermarket manuals have been known to be wrong too sometimes. I'll keep trying to find a GM '05 diagram from other sources, like an '05 GM paper manual if I can find one.

Just part of the fun of working on 20yr old cars. So wherever it is, make sure your coils have a good ground. Hang in there, you'll figure it out

 

@C5 Diag @wjnjr

Thanks for your help so far i got a new oem gm crank sensor today. I write here as soon as i trsted it if it works or not (:

Otherwise i try to rewire a new ground cable to the coil connectors maybe that will help.

Regards

 

G107 on my 08 is driver side next to the cat.

 

OK, that corresponds to the '09 shop manual diagram. The GM ground labeling standard is odd numbers on the driver side, even numbers on the pass side. For what it's worth, the '05 coil wiring schematic shows all 8 coils grounded at G107, same as the all data diagram. Only difference is which side of the car it's on.



Still looking for a 2005 engine wiring harness diagram...

 

Could not find a specific engine harness for an 05 but this lists all the connector numbers.

 

Not sure about this, but I thought I would mention it anyway. Are you sure that you have fuel coming out of the injectors? The reason I ask is that as I recall, under some circumstances the RCDLR will not allow fuel and/or spark until it is sent a certain code (or something like that. Maybe someone more knowledgeable will comment.

 

Good call on the coil wire connectors. We just need to find C139 & C140. "Above the left & right cam covers"??

 

No spark and injector pulse would normally be a bad crank sensor.

 

Seems like the crank sensor is working since he does read 200 rpm while cranking.

 

So i tried the new gm original crank sensor.

And it started right on the first turn

So the new ntk sensor i had previous was defect

Thank you all very much for your help

Regards Flo​​

 

Thanks !!….maybe I missed that !!

 

Thanks for sharing your experience. Glad to hear you found & fixed the problem! Now enjoy the car!