billiards

Here are the codes... P0302, P0340

The check engine light came on a little over a week ago. Had the codes run. The P0340 came up. Changed both the cam sensors along with the crank sensor (since it wasn't changed last year when the P0340 code came up then). I cleared the codes afterward.

Today, the code - P0340 - came back. The truck was still running fine until I stopped for lunch. Got back in, started it up, and it ran like crap! Got back home and ran the codes again. This time, P0302 (cylinder 2 misfire) and P0340 (camshaft bank 2 position sensor).

I got online and did a little research. I pulled the wires to the two cam sensors and the truck ran fine again. Did a little more research and reconnected the cam sensors and disconnected the VCT sensors. Went back to running bad.

I'm at my wits end. WHAT DO I DO TO FIX THIS?????

PLEASE HELP!!!!

billiards

So, here's what I have found so far. Also want to get some opinions as to what the right course of action should be...

It is appearing as though this is a major issue with the cam phasers/timing chains, etc... MAJOR problem and at least somewhat big money to fix (somewhere in the $1500 to $2000 range). This still won't fix the underlying issue of the motor having right at 300k miles on it.

I found a local shop that will put in a rebuilt Jasper engine in it for $4300 plus fluids and tax (engine included). So, roughly $4800. Although it will be a bit tight, I do have the funds to get it done. I've kinda been expecting the motor to quit at some point anyway.

I paid $18,500 for the truck back in '08. I've put a new transmission in it about 8 months ago. That was another $2000. If I'm into a motor for $5000 and I replace the interior with leather for another (on the high side) $3000, I will be into the truck for a grand total of $28,500. Now, I have already gotten 8-9 years out of it and 300k miles. With all this work, I should get at least another 8-9 years out of it. The truck at this point will basically be back like new. I'm thinking this is kind of a "no-brainer".

For less than the cost of a new truck, I can have two truck lives out of this one.

Am I missing something? Or is this the right way to go?

techrep

iTrader: (1)

Still trying to figure out how tax and fluid adds up to $500.. but, I agree with you on the re-man with your current motor having over 300k miles on it.

billiards

Tax here is 9.75%

$4300 x 0.0975 = $4719.25

techrep

iTrader: (1)

Ouch..

billiards

So, I still have a slight dilemma.

I know that USUALLY a misfire is caused by an electrical problem. However, I also know that this motor is almost completely "fly-by-wire"; meaning, it is POSSIBLE that the cam sensor is sending some goofy signal to the computer and, thus, telling it to fire out of time (the P0302 code and the miss).

If this is a relatively simple repair (costing less than $1000), I'm willing to do the repair and stave off the inevitable motor swap. If I can get another year or so out of this motor, it's worth it. BUT, if it's an internal motor problem causing this and the repairs are in excess of $1000, I think it would be worthwhile to just go ahead and replace the motor.

I'm still looking for anyone's input on this. Anyone else had this? Anyone know (for certain) that internal or cam phaser/timing problems could cause a misfire on just ONE cylinder?

nrivera04

I had a cam follower (rocker arm) seize up and scored one of my cam lobes causing a cylinder 3 misfire. So it is POSSIBLE. At that mileage I would be inclined to do the motor swap as well though. Mine happened at 110K and the mechanic was confident the motor would be fine. 3 years in and it's still going strong at about 155k.

Fordguy9269

So, did you figure out the original issue of this post? Also at 155k you were still going strong were my truck decided to go nuts around thar milage.
Any help would be appreciated! 2010 5.4 a/t, it been a great truck honestly, regular maintenance is always done, and I stay on top of any possible issues as soon as I find them. I've replaced the variable timing solenoids, and had the valve body replaced ( thanks Amazon & Dorman Products!) within the last year, but she ran like a new one and averaged 20mpg constantly until the transmission works, but recently I was heading to town and it dies for no explainable reason, as it coasted to a stop I noticed the idiot light on. So I grab my scanner to check codes, P0302 & P0340 (#2 misfire & cam position sensor) I'm like okay I can't leave it sitting here so. It acted like the battery was dead, so I got a jump start to get 6 miles home, made it about 4 1/2 miles. Pulled the scanner back out, nothing new, finally got a ride town to get part I thought I should need, spark plug, coil pack, cam Sensors, crank sensor ... get back only to check #2 spark plug and see its been sheared off! Now these plugs have been in for 8000 miles or so, so I decided to see if I can manually turn the engine over, breaker bar with a pipe and I'm not able to do it. So I'm lost as to what happened and why? This engine went from running perfect to not running like the flip of a switch the the 1 time it did run it ran BAD, I should have shut it off but was trying to get to a doctor's appointment.

techrep

iTrader: (1)

that post is 7 years old.

Fordguy9269

yes I'm aware of that which is why I apologized for bringing up an old thread...