yea, no additives in the fuel of any kind (injector cleaner is not necessary in most cases) the fuel pump in IN SIDE THE TANK dont change it unless it is bad, it is a lifetime unit. no need to change the oil weights btwn the summer and winter unless you live in an area where the temps range from 80-90f in the summer and -10 or less in the winter, definitely change the plugs, use copper core champion gapped to .040 and make sure the air filter is clean

 

WOW

Dude said he has 50K and it's a 4.7l in the first post, details in user info show 03 durango.

To me, none of the things you mentioned are relevant, or even closely related to the problem he is describing with lack of pressure upon start up.
after having tore down my own 4.7l and a 2.7 (another poorly designed engine) with a knock I replaced my oil pump with a Melling for a $100. If I had my way I would have motor swapped the 4.7 for a 5.2 or a 5.9, but the extent needed for a proper conversion is far too involved to not just go get a truck with what you want. I will vouch that in the past year onmy 99 neglected 5.2 2wd Durango I have had no problems after plugs,cap,rotor,wires and a thermostat gasket. The $.7 however has not run right since I bought it and that's after $1,300 worth of new parts.

 

you (or the previous owner) have most likely not taken care of the engine properly, i have a 4.7 in my truck and it has had NOTHING except for basic maintenance done to it(change the oil spark plugs ect) and w/ 96k on it still starts and runs like it was brand new, im sorry you got a truck w/ an abused engine, but that does NOT make it a bad OR poorly designed engine

 

Then you miss read the oil weight then. If the oil was too light then he would have a low pressure issue. Also a failing sensor and a number of other things.

As far as your issue with your truck, you dropped $1300 bucks into the incorrect parts, that isn't the trucks fault, it's your fault for a misdiagnosis. Besides, regular maintenance runs up a tab. For instance, I had a shop go through mine and replace trans filter adjustment & purge the trans, pull the diff covers and inspect and flush the diffs, and flush and camera the T-case, that in it's self was $475 with Fully Synthetics. That is regular maintenance of a vehicle, they cost money to run.

 

I don't see how or where I said anything about weights or viscosity of oil. I run 5w-30 Valvoline Synpower. Also you said I dropped $1,300 on incorrect parts.... Not quite sure what you are talking about there unless you are making mention of the $178 ebay timing kit that I took out and shipped back. You live and learn.

I do know that most of the budget was the reman heads, as mine were roasted pretty good.

As for tyhe OP, I think he will agree these 4.7's along with the 3.7 and 2.7's are junk. Five minutes of google searching will pull up TONS of articles about rod bearings failing in most every Chrysler with a 2.7. No one else ever found it odd to see old Mercedes 300D's and 1988 Toyota Tercels still rolling around today, but you can't find a running 300m to save you life without a Knock knack knock like Curly from the 3 stooges is is under the hood.

Here's a link to a thread on DT about 2 4.7s's that had dropped valve seats.
http://www.*********.com/forums/arch.../t-145680.html


Some motors are great, and some are muff cabbage. The 318/5.2 is a good solid motor, obviously because they made it for 30 years. Yet the 3.7l,4.7l and 2.7l ran for less than 5 years.... coincidence? I think not. Most car companies save money on tooling by producing the same thing and it gets cheaper and they can be more competitive down the road. An across the board engine redesign is a clear indication that even Chrysler recognized they made a boo boo somewhere and though like most car makers getting them to admit they f'ed up is like pulling teeth. A total redesign IS about as close to a admission as you're going to get.

 

if so many 4.7s have this problem how come none of the members on this site have had that problem with their engines? o wait bc its NOT a problem if you actually take care of your engine, 2 cases does NOT make it a common problem, sorry, but the 4.7 is a pretty solid engine in not only my experience but that of many on this site, are they a little bit picky about maintenance? some have claimed that, but im not perfect and have not had any problems w/ mine (mine is 9 years old now and while is a low mileage engine 9 years is quite a bit more than the 5 years that you are talking about)

 

And you stated:

What do I have to spell it out for you?

Then you stated:

And therefore I stated you fixed the incorrect parts then! You are the one that said it, I explained what you couldn't comprehend! It's not my fault you aren't a English Major and it shows!


Second, the 5.2L and 5.9L share the same block and have so for years, not to mention they have the HEMI 5.7L which shares the basic same block as the 5.2L and 5.9L and the basic building block for the last few years of HEMI motors.

I think you need to find your way back to school dude!

 

They are not the same block anymore than the all the different displacement small block chevy motors. They share the same basic design but are not the same block. If you crack the block on your 360 you cannot use a 318 block to replace it the bores are different sizes as well as the stroke being different on the crank.

 

Really I thought when hydra said they're the same block that meant they were the exact same thing... So the 318 and the 360 are not the exact same thing? They have differences?!

OMG why do people have to be so literal.

 

You may not believe this but some people really won't know this fact. Do you know which SBC motors do share common blocks? I checked just to make sure my thoughts where right and they where not the same because I am rather mopar ignorant. There really is a lot of good info here and I like the site but some of the people on here are not very mechanically inclined and simple thing like this could have them buying the wrong stuff because the read it on here and assumed the rest without asking questions.