Narrowed down to Lifters or failing Timing component.
The dealer is correct (it can happen) that he needs a motor due to compression of cylinder 2, so timing or lifter issue will obviously be addressed with the engine swap.
Customer is cost conscious and we start looking at salvage yards www.car-part.com for 2006 F150 4.6L engine. $1000+ for motors with higher mileage than this damaged one!! BUUUUT WAIT the 2010 Lincoln Town Car 4.6L Flex Fuel engine is only $600 with 50K miles. Shows it wont fit, but I look at part numbers between the Block, Bare Heads, Crank, Camshaft, Timing Pieces and these all match. I figure I can make it work with a few swaps.
Plus I will pretty much be resealing the whole motor and not worry about leaky used motor. These must be so much cheaper because of lack of demand and too many available... Iím guessing
Comes in super clean and without the intake. Maybe this was damaged in the original vehicles accident. I think they normally include the intake, but no big deal.
Have to swap intake, valve covers, timing cover, oil filter adapter, oil pan, coolant tube (waterpump to heater core buried by intake),
And decided to Upgrade Plastic timing hydraulic tensioners to all metal better sealed versions.
How did this happen? The Engine install went smooth. One of the least problematic engine swaps Iíve done (less the forgotten bolt holing the transmission dipstick to the motor causing small transmission leak when yanked with the motor. Fixed with 1/2 quart of fluid and jabbing the dipstick tube back in the transmission) Fuel Trim seemed off a bit, but no codes on long test drive. We are good!
Customer brings truck back in 4 days for much needed Suspension work.
Yes, Code P0302. Cylinder 2 Miss-Fire. Fuel Trims show Bank one rich and trying to lean out taking away fuel. Bank 2 shows good.
Took Injectors and swapped from bank one to bank 2 AND Trim followed suit.
This rules out Computer, Oxygen Sensors, ENGINE!, or bad wiring or harness.
Has to be injector -- Barring information I either do not know yet or doesnít exist,,, the injector.
I am done troubleshooting and replace the injector.
Hey, its never a 100% in this profession until it is.
Replacing the injector in Cylinder 6, exactly the same injector that was in Cylinder 2 before last troubleshoot procedure. Trims all good and no codes after a few weeks now.
Iím guessing this is probably the case.
Engine Lights are a necessary diagnosis and troubleshoot procedure. Just pulling the codes as the parts stores do is only the first part of repair. The codes give you a starting point for the trouble shooting process.