Hi All ,

This past weekend I changed the coil packs and reset the check engine light by disconnecting the neg battery terminal for 15 mins and reconnecting it. I took the car for a drive and everything seemed fine.

This morning my daughter came back from vacation and took the car for work and now she says the car does not go over 50.

Any suggestions on what to look for ?

Thanks in advance,
MP.

 

There are lots of things to look for. I suggest first to scan the computer for any potential trouble codes which might help steer us in the right direction.

 

She brought it to advanced auto and there are 2 codes now p0358 and u1900.

 

DTC P0358 Ignition Coil H Primary/Secondary Circuit Malfunction

You most likely didn't plug the #8 coil properly. For U1900, that's harder to troubleshoot without more info as it is more like a generic communication error on the network between the modules. If you have an OBD-scanner (bluetooth or USB), use FORScan (free) to find out which module is throwing that code, or ask that Advanced Auto shop about which module had that code. It can be a simple fix, like a broken wire or connector needing cleaning and reseating, or it can be an internal fault in a module.

 

I did reseat the coils ? I will look again and reseat them again. Advanced should be able to tell me the underlying module for u1900 ?

 

Depends on their diagnostic scanner tool, but if they have a professional one with access to all systems they should be able to see the underlying module and the associated code with it.

 

Thanks very much

 

Swap the #7 and #8 COPs (your engine doesn't have coil packs) and drive it to see if the problem stays with the #8 coil driver circuit or follows the COP to #7.


The U1900 indicates a communication error over the CAN Bus network. (Your vehicle supports three different network protocols so that the various modules can share data between them. Its prolly gonna take a Ford high end scan tool to identify the problem. You could at least double check your COP swap work to see if you may have cause a boo boo to the wiring harness, and also check that no fuses have blown.) And it may run fine with the U1900 - just depends on what data is not getting through which network.)

 

Actually, FORScan can read the codes well enough to pinpoint a U1900 fault including the accompanying fault code. And it's free. I recently stumbled across it myself, and it's truly awesome together with a simple bluetooth OBD adapter

 

He's talking about the 2-wire connector going to the #8 coil. The 0358 code indicates a break in the electrical connection to the #8 coil.