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Hard Start, Rough Idle after Injector Harness Replacement
This is my first forum and post, look forward to learning a lot as I have already and for everyone's support. Hope yall can help me with my issue. Sorry for the long post and thanks in advance.
I recently purchased and early 04 f250 CC with 138k miles. Owner had taken it to a shop at 134K and they added a new oil cooler, oil stand pipes, coolant filter, injectors, and EGR cooler. Have been going through and doing all the maintenance on it including a thorough coolant flush. In the last couple of months the throttle has cut out on me about 10 times while accelerating or high fuel demand and the water in fuel light has come on as well. After some research in the forums I learned either a dirty HFCM or bad injector wire harness. I pulled and cleaned the HFCM, was not too bad. I ordered an injector harness and figured I would swap it in before my last coolant flush since I had the degas bottle out of the way and can easily reach the FICM. Learned about the chaffing issues and decided to address those as well while swapping the harness. During my coolant flushes truck ran absolutely perfect.
Yesterday I pulled the old harness off and installed the new harness making sure to route it correctly. I also taped up the engine harness in several spots that had been worn and looked at the connectors in various spots. The VGT solenoid connector needs to be replaced as it is all cracked. When I looked at the old injector harness it was in bad shape, several cracked wires at the connectors. One connector had all the wires cut and they were soldered and taped up!! Horrible job not sure why they did not replace the harness when they did the injectos! Connected the new harness to the FICM and injectors and reinstalled the FICM and other components. FICM has a sticker that it is a REMAN. Being pretty proud of myself for replacing the harness I start truck and it has a hard time starting and runs really rough idling like it is missing or loping! Sounds horrible!! My dad asked me if I unplugged the batteries when puled the FICM, nope, totally forgot!! Was too excited to get the harness swapped out. Do you guys think I fried something?
After being on the forums last night/early morning I am thinking I need to check the FICM voltage and the voltage at the IPC sensor which I plan on just stabbing the wire on the back side (I know bad practice, all I have it a volt meter). I probably need to check for codes as well but do not have a scanner at this point. I plan to check the FICM first. Just confused how it went from running great with a bad harness to running terrible with a new harness. I am also thinking of swapping the old harness back in just to see if the new harness is faulty somehow.
Any other thoughts? Could I have fried something since I did not unplug batteries. Pretty ticked off at myself at this point.