2006 4L V6 New Ignition Module: Now What?

[JerryB]

XLT with 4235 Miles on Jasper remanufactured engine. New plugs & wiring with engine. ~ 400 miles ago, it started showing Codes P0300, P0302 & P0306, only with higher power settings on uphill segments. No obvious missing, but significant power loss. Sometimes engine icon just flashes, then goes out. Other times icon stays on solid & above codes are set. I just replaced the ignition coils with no change.

Any suggestions greatly appreciated!

 

[Tech By Trade]

Fuel filter first, injectors, then rail.

 

[JerryB]

Tech By Trade:
Thank you for the suggestions. It already had a new fuel filter less than 500 miles ago. The injectors were replaced with the reman engine, and not certain, but I believe cylinders 2 & 6 are on opposite fuel rails.

Also, there was no 'feeling' of a misfire. Just a sudden, smooth large reduction in power and RPM, then resumption to normal in a half mile or so. Still ran smoothly, even when the power was reduced.

All:
We went looking for something else. The shop that replaced the engine did a very poor job of reinstalling the wiring surrounding that engine, so we approached this as if it was an intermittent failure in the wiring. With a little detective work and wire wiggling, several problems were found. At one point during the troubleshooting, the engine wouldn't even start due to the input voltage to the new ignition module being missing. (That shows up on an OBD scan.) Wiggling the loom would make it start, then die.

My (new) mechanic found several places in the loom where the insulation was either missing, compromised, or there were suspect connections. A couple of sessions with some new wire, a solder gun and some shrink sleeve seems to have solved the problem. Got about 200 miles on it now with no problems

I'll let all know if this holds up.

 

[pzy3339]

Sounds like they owe you some money back

 

[JerryB]

Yeah, good luck on that.

I had used the shop that replaced the engine for lots of years and was really happy with their performance and prices. It was a father / son partnership where both of them were on site, both putting hands on and closely monitoring and directing a couple of hired mechanics. Then they moved to a much larger shop, the father retired and the son (now sole owner) was seldom on site. Things went rapidly downhill after that.

When I went to pick up the truck with the reman engine, the desk clerk handed me a bill that was more than $1000 over the quoted price! Needless to say it was noisy afternoon, but the owner finally showed up and agreed to take the amount of the original quote.

I agreed not to say bad things about his operation, but I also told myself to absolutely not use them again.

I have recently found a new shop (through a friend's recommendation) where the owner does all the work, his wife does the phones, billing and parts running. Great to be back to a family owned business where the owner takes responsibility and the customer comes first.

About 250 miles on the truck now with no power reductions or codes being set. Hopefully the problem is solved.