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No spark from passenger coils

4.8K views 7 replies 4 participants last post by  Roush  
#1 · (Edited)
What can cause no spark to one side? I only tested one coil so far. Can bad ECU cause this? If not that, where is a good place to start looking? Thanks
 
#2 ·
If you only tested one coil so far, then all you or anyone else knows is that you have one bad coil. First test all the coils impedance for in or out of spec...then you need to test the voltage output to the connectors that plug into the coil to see if you have a problem that is upstream from the coils. My bet is that you have a bad coil.
 
#5 ·
I've read many posts about same issue, some have had problem due to ignition key. I believe I only have the valet key. If I do not have correct key or it's not communicating with ecu/ipdm will that cause no spark issue? I did read if you do have bad key, will not start no matter what.
 
#6 ·
Well, truck was towed to dealership last Thurs, called me on Sat to tell me they had not figured out the cause. Service guy said they called the factory to get some advice. I'm hoping it's something simple, I can't see it being a big deal especially when it was running fine before I did the work. I'll let you guys know.
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