Ok,I`m a little wound up right now-maybe the shot of Baileys will help,here`s the story.Friday the 14th on the way home from work my truck started bucking and stalling at a red light after running fine.I nursed it to a local mecahnic with the engine light on and wepulled codes P0300 and P0307 which are a random multiple misfire and a #7 misfire.I left it with him to diagnos further and he ended up calling the dealer for advise and they told him first thing to do is change park plugs.Truck has 35,000 miles so I figure might as well and the mecjanic recommended Autolite Platinums-good for 100k.Didn`t fix the porblem and after some more diagnosis still had no luck so I called AAA and sent it to the dealer,not the dealer I usaully go to but they already had talked to my mechanic so I figured send it there.They call and tell me they think it`s a broken valve spring and order them up.I get a call today saying it`s all set to pick up.Well I get there and it starts and idles fine but when I start to drive across the parking lot I feel a BIG hesitation.I try agian and the same thing so I go right back in the dealership and ask them if they test drove it and the service guy says yes and they did notice the hestiation and thought it was like that before and that wasn`t the problem it was in for!I tell him it never had that before and he said it might be the throttle body sticking and also says it has the wrong plugs in it and that may be the cause-[Edited by Moparts - Keep it clean]!I don`t know if they screwed something up putting it together or if something else is wrong.

Would Autolite Platinum plugs not be good for this engine and cause problems?

If they screwed something up how do I prove that so it doesn`t cost me money for them to fix it?

Why would they assume I had this problem to begin with or think it would be OK to say my truck is fixed without telling me anything?

If I do think it is thier fault how do get in touch with the area service rep or other contact to resolve this?


Oh yeah,are broken valve springs a common problem on the Hemis?

You might want to make that shot a double ...

The plugs are causing the hesitation ... good one ...

First off..Modern Mopars are not real receptive to "trick of the week" spark plugs, Put in it what is supposed to be in it (IIRC RE14MCC4) and before the crap starts...if anybody has trouble believing me on that...come do my job for a while, this isn`t my first rodeo
Second, have them..or somebody clean the throttle body, Good...do not just wipe it out, remove it and clean it good, it must be spotless

While they are there pop the map sensor out and make sure it dosen`t have alot of buildup on it.


And yes some of the early 5.7`s had a tendency to break intake valve springs, It isn`t so common that every one does it, but it happens.

Just my

Rick

Rick are you saying that motor is that finiky when it comes to a plug ?

I for one don't buy into the 100K spark plug change interval , thats nuts .

Owners manual for wifes 07 4.7 says one and only one number of Champion plug every 24,000 or pre-ignition will occur.In 08 they went to 2 plugs per cylinder and I think the wrath of god warning went away.

Get it to a dealer and let them scan it further.

Could be a sensor or dirty throttle body, but it is possible that one of the springs may be getting weak or is broken. It is not very common, but can happen in 03-05 Hemis. If it is the problem, replace it or all of them with the updated version and it shouldnt happen again.

Yeah broken valvesprings are common on new hemis- even aftermarket springs break, beehives save weight at the cost of durability.

Has the hesitation gone away yet, I had a PCM problem with my 04 when it was new and the new PCM took a few days to learn, for the first 50 miles it would barely run, spit, sputter and stall out, it took about 400 miles to get back to normal, if they reset the PCM it may be the problem.

The first thing I asked them is if the computer needed to relearn and they told it didn`t and was not the problem.Got a call today saying the throttle body is no good and they are replacing it and I will have to pay another $100 warranty deductible.How do I get a hold of a zone manager to complain to?

What shape is the battery in? I would have it load tested rather than just checking the voltage with a meter.

I`ve been told they can waive the deductible which is exactly what they WILL do!