hey I'm having a no start issue that i cannot figure out. Everything started after I changed two exhaust lifters to fix a ticking noise. A list of parts that were replaced during this job include: timing kit (chains, guides and tensioners), water pump, all new gaskets, both belts, external oil cooler, camshaft sensors and crankshaft sensor. After putting everything back together the car cranks over but doesn't start. I checked and I have injector pulse but no spark from any of the coil packs. i checked for voltage from the battery to each of the coil packs and its a full 12volts. Also the coils have good grounds and .4v coming from the computer. I have also taken the timing off and re checked it twice so i know the timing is not the issue. does anyone know of any engine sensors that would disable spark to the coils. The only one i can think of is the crank sensor, which has been replaced once with one from autozone then replaced with an OE one. all the wires going from the crank sensor to the ECU have .3ohms of resistance and no opens or shorts to ground. Does anyone have any ideas or thoughts on possible problems. also a possible test to see if the ECU is still good.
any help would be greatly appreciated

 

Maybe a problem with the immobilizer? If your key code is lost, it will crank but with no ignition. Throwing any OBD codes? The dealership will have to program your key into the ECU if it is lost.

 

No codes and the security light turns off when I put the key in

 

Cranking but no spark sounds like NATS issue to me - at least that's the direction I'd be looking.

 

We'll the NATS has to do with the security system and the security light turns off when e key is installed and turns off when the key is removed. Also the BCM doesn't have any codes in it and usually when the immobilizer is disabled it will throw codes. But at this point it could be a possibility. Do you know if you have to have 2 sets of keys to reprogram he system

 

I'm not sure. When I had issues with mine, I just took it to the dealership.

 

It could also be a a crank or cam sensor. When my crank sensor went bad i didn't get any spark.

 

This is likely the cheaper route.

OP, have you tried probing the sensors themselves?