Hey ya'll, need help.
2010 Ram 5.7, had a collapsed lifter in #7 (P0307). Two years ago I had to put new cam/lifters in her. Ran great since then, until I got the #7 misfire. The lifter was barely squishy and I caught it in time where did not damage the cam lobe.
Ordered the same lifters (non MDS) and got it all back together, programed it and tried to start it. Cranked but no fire, unless I mashed the pedal down but wouldn't stay running.

Had the head machined
New head bolts
New (16) spark plugs
New head and intake gaskets of course
Still doing the same thing, my fuel pump turns on. Didn't check the fuel presure but feel like its fine. Tested the coil packs, took off and cleaned the Throttle Body. Map sensor looks fine. Still the same Random misfire/Mutiple miss fire (P0300)

Any thoughts on what is going on here. Thanks.

 

Got a scanner? See what the PCM thinks engine temp is.

 

I have a Predator 2 that came with the 2 year old cam kit, not sure if that will tell me the engine temp. I'll have to put it back together. I took the intake off last night and was going to go back through the work I did. Also have a cheap code reader. Probably not gonna do it....

 

I'm just baffled, it wasn't running terrible and would start right up without touching the pedal before I shut it down and had towed back to work on it.

 

So, I forgot to mention that I left my intake sitting outside overnight by accident and it did rain on it, had it drying out for 2 day hot days. Had a towel in the throttle body but it all got soaked..

Yes I am not the smartest at times but do you think it could have messed up the throttle body??

 

Shouldn't......

 

So today at work I got a hold of an engine builder from AMS, where I originally bought the cam kit years back and where I ordered the lifters for this recent job.

Last night I found that #5 and #7 extaust rockers where both tight when they shouldn't have been. He ask if I soak the lifters in oil before install and I said well of course. He said you do not want to soak them at all, they can get stuck full of oil, then he told me to use the push rod and bailling wire to depress the tiny vavle inside the lifters to squeeze out the oil to make them function properly. Did all that and believe or not the rockers were not tight as hell like they were before under no load..

Felt very hopeful that this was the issue but of course it wasn't, all back together and acting the exact same. Not saying he didn't help a little but I feel very defeated at the moment.

Should I try crankshaft and cam pos sensor for the hell of it.... Lost lol

 

What does the PCM think engine temp is? Is the temp sensor plugged in?