Hi, I recently changed my spark plug wires and plugs to Magnacor 8mm and Bosh Platinum+4 and now my truck won't start. I suspected that I may have done something wrong so I removed the upper intake plenum and thouroughly re-inspected all connections including low voltage connections on the sides of the coils. All connections are correct. I by passed the fuel inertia switch and no change. I was wondering if it's possible that by doing this somewhat straight forward job. Communication could have been lost between the ECM which would prevent it from sending out power to the coils. I have inspected all fuses and they are all good. I immobilized and re-mobilized the vehicle several times to try and engage the ECM. I am not getting spark to any of the plugs. Please Help.

 

No spark means bad crank sensor.

 

Engine ran fine prior to changing wires and plugs. Could doing this job have upset the crank position sensor. Thank You.

 

Well it could just be a coincidence, or it could be you knocked the crank sensor loose.
But I would be leaning heavy on the cranks sensor being bad or unplugged.
You can buy it locally.

 

I checked the connection on the cps it was good. I read in one of the threads that if you change the cps on a discoveryII you have to have the ecm reset by a dealer. If this is the case could my ecm not be recognizing my cps. Thank You.

 

No you do NOT need to have the ecu reset if you change the crank sensor, it is a plug and play type of thing.

 

Thank you Spike555, I re-investigated the cks by disconnecting it. My wife was able to route the wire harness back up behind the upper manifold where I could take a good look at it. It looked good I gave each of the three wires a tug to make sure they were sound connection. I was disappointed that I did not find any obvious problems. I re-connected the harness to the ckp and the truck started right up. Before I messed with this connection I had tried starting this truck for 2 days and at least 100 cranks. Thanks.

 

You're welcome, glad your truck is up and running again.