Engine miss

[Ken parker]

I have a 5.7 hemi that has a consistent miss on cylinder 5 . To date I have swapped coils . Replaced plugs and also pcv valve . It also is getting gas in the oil to the point oil pressure starts dropping after about 1500 miles or less and smells like gas . Fuel pump replaced 2 years ago . Higher rpm’s cause engine miss to get worse and stays missing badly for a few minutes after high rpm’s like 4k plus .

 

[EdGs]

Have you swapped injectors to see if problem follows?

Mileage?

 

[CheechDogg.0n37s]

I have a 5.7 hemi that has a consistent miss on cylinder 5 . To date I have swapped coils . Replaced plugs and also pcv valve . It also is getting gas in the oil to the point oil pressure starts dropping after about 1500 miles or less and smells like gas . Fuel pump replaced 2 years ago . Higher rpm’s cause engine miss to get worse and stays missing badly for a few minutes after high rpm’s like 4k plus .

What grade of gas are you using? If you are using 87 or 89 switch to 91 ... getting gas in the oil is not a good thing and hopefully it hasn't damaged your engine already, but a dude I know with a hemi was getting gas in his oil, started running 91 and it went away ...

Now don't think that just by switching to 91 that you will be good to go, you should still find out if anything was damaged since you have already had the gas in the oil ..

Not directed at you right now, but I don't understand why saving a few bucks at the pump is worth risking damaging your car's engines by using mid and low grade gas ... I ran nothing but 89 on my truck for the last year and just switched back to 91 in September ... my truck was not running like it did when all I used was 91 .... these threads keep popping up everywhere not just here about misfires, engine knocking, blown this and that ... the one thing they all have in common is using 87 and 89 octane in their trucks ....

You might have to replace your coils again, maybe other things, but make sure you find anything that is already damaged and seriously switch to 91 !!!!!

 

[Sillygoose]

What grade of gas are you using? If you are using 87 or 89 switch to 91 ... getting gas in the oil is not a good thing and hopefully it hasn't damaged your engine already, but a dude I know with a hemi was getting gas in his oil, started running 91 and it went away ...

Now don't think that just by switching to 91 that you will be good to go, you should still find out if anything was damaged since you have already had the gas in the oil ..

Not directed at you right now, but I don't understand why saving a few bucks at the pump is worth risking damaging your car's engines by using mid and low grade gas ... I ran nothing but 89 on my truck for the last year and just switched back to 91 in September ... my truck was not running like it did when all I used was 91 .... these threads keep popping up everywhere not just here about misfires, engine knocking, blown this and that ... the one thing they all have in common is using 87 and 89 octane in their trucks ....

You might have to replace your coils again, maybe other things, but make sure you find anything that is already damaged and seriously switch to 91 !!!!!

once again, you're on some stuff man...
To the original poster, swap injectors to see if the misfire moves to another cylinder. If not, pull a valve cover and check rocker arm movement on cylinder 5. Symptoms sound like cam/lifter problem.

 

[CheechDogg.0n37s]

once again, you're on some stuff man...
To the original poster, swap injectors to see if the misfire moves to another cylinder. If not, pull a valve cover and check rocker arm movement on cylinder 5. Symptoms sound like cam/lifter problem.

Man oh man it's you again, rent free eh ?

If you can't afford 91 just say so

Like I said before, the stuff I'm on it's simply too much for you kid ...

 

[huntergreen]

What grade of gas are you using? If you are using 87 or 89 switch to 91 ... getting gas in the oil is not a good thing and hopefully it hasn't damaged your engine already, but a dude I know with a hemi was getting gas in his oil, started running 91 and it went away ...

Now don't think that just by switching to 91 that you will be good to go, you should still find out if anything was damaged since you have already had the gas in the oil ..

Not directed at you right now, but I don't understand why saving a few bucks at the pump is worth risking damaging your car's engines by using mid and low grade gas ... I ran nothing but 89 on my truck for the last year and just switched back to 91 in September ... my truck was not running like it did when all I used was 91 .... these threads keep popping up everywhere not just here about misfires, engine knocking, blown this and that ... the one thing they all have in common is using 87 and 89 octane in their trucks ....

You might have to replace your coils again, maybe other things, but make sure you find anything that is already damaged and seriously switch to 91 !!!!!

I to am baffled on how switching octane would cure gas getting into the oil. How does a hegher octane plug a leak ?

 

[huntergreen]

I have a 5.7 hemi that has a consistent miss on cylinder 5 . To date I have swapped coils . Replaced plugs and also pcv valve . It also is getting gas in the oil to the point oil pressure starts dropping after about 1500 miles or less and smells like gas . Fuel pump replaced 2 years ago . Higher rpm’s cause engine miss to get worse and stays missing badly for a few minutes after high rpm’s like 4k plus .

On my phone so no idea what year your truck is, but suggest pulling the valve cover and check the movement of cylinder 5. I also suspect you have a lifter failure. If all checked out, then check out the fuel injector.

 

[CheechDogg.0n37s]

I to am baffled on how switching octane would cure gas getting into the oil. How does a hegher octane plug a leak ?

It doesn't ... that's why I said make sure you find what has been damaged and replace it ... then switch to 91 and stick with 91 ... bad quality gas is causing a lot of misfire in these trucks but people don't want to admit it or even believe it ...

This is one subject on these Ram trucks that I am keeping a close look at, every chance I get to talk to people who work on these trucks the one question I ask is the octane that should be used ... they all say 91 but if you want to save money go with 87 but expect issues down the road and early down the road ...

 

[huntergreen]

It doesn't ... that's why I said make sure you find what has been damaged and replace it ... then switch to 91 and stick with 91 ... bad quality gas is causing a lot of misfire in these trucks but people don't want to admit it or even believe it ...

This is one subject on these Ram trucks that I am keeping a close look at, every chance I get to talk to people who work on these trucks the one question I ask is the octane that should be used ... they all say 91 but if you want to save money go with 87 but expect issues down the road and early down the road ...

My manual states 89 preferred 87 acceptable. If you are correct, guess I’ll be using that lifetime warranty. Lol.

 

[Ken parker]

Have replaced injector already on cylinder 5 which is where computer keeps insisting miss is at . Swapped coils with cylinder 1 and no change still says cylinder 5 is where miss is at . Replaced plugs next and cylinder 5 had both plugs black others were all clean but due to be changed . No change. So replaced injector yesterday again no change . Pcv was done 2 weeks ago first time I had to change oil due to gas in the oil and thus dropped oil pressure . Thoughts of map sensor or maf sensor but if they were having issues you would be expecting them to be throwing out their own code but it’s not. Only codes are for cylinder 5 miss, air ratio imbalance and after I have accelerated hard a code for multiple cylinder miss comes up. I do not today it’s starting to miss at idle where before it did not . Before it was only under load or heavy acceleration And btw my first time ever using a dodge forum .

 

[Sillygoose]

Sounds like you've swapped around everything you can with the same result. Time to pull a valve cover and check rocker arm movement on cylinder 5. You most likely have a cam lobe chewed down from a seized lifter.

 

[Burla]

Most likely cam/lifters but the gas in oil gives a bit of hope it is not, but the gas could be secondary to the misfire. It even sounds like a cam, usually those first happen under load. Cam/lifters are a known issue with rams, the dealer uses the oil control valve to decide whether to fix or replace engine. If you pull the oil control valve and there is metal shards, game over.

Mileage?

One unique thing about ram forum, follow others and lubrication strategies with the new cam. Hemi tick has given us a window to real in depth solutions, as in follow the science you can actually kill hemi tick with an oil change at a 80% success rate proven over a decade.

 

[CheechDogg.0n37s]

Have replaced injector already on cylinder 5 which is where computer keeps insisting miss is at . Swapped coils with cylinder 1 and no change still says cylinder 5 is where miss is at . Replaced plugs next and cylinder 5 had both plugs black others were all clean but due to be changed . No change. So replaced injector yesterday again no change . Pcv was done 2 weeks ago first time I had to change oil due to gas in the oil and thus dropped oil pressure . Thoughts of map sensor or maf sensor but if they were having issues you would be expecting them to be throwing out their own code but it’s not. Only codes are for cylinder 5 miss, air ratio imbalance and after I have accelerated hard a code for multiple cylinder miss comes up. I do not today it’s starting to miss at idle where before it did not . Before it was only under load or heavy acceleration And btw my first time ever using a dodge forum .

You still didn't say what gas octane you are using ... 87, 89 or 91 .... can you answer and say which one ?

 

[Sillygoose]

And what did you have for breakfast....

 

[Ken parker]

180k on miles

 

[CheechDogg.0n37s]

180k on miles

So you don't know or don't want to say what octane gas you use ... got it !

 

[jws123]

So you don't know or don't want to say what octane gas you use ... got it !

I have been running the cheapest gas possible im my 2011 abused the hell outa it and she still runs great over 200k.

 

[CheechDogg.0n37s]

I have been running the cheapest gas possible im my 2011 abused the hell outa it and she still runs great over 200k.

Great , keep doing it, if it's working for your truck then you have nothing to worry about right ?

 

[Burla]

Sad about the lifter situation, nobody wants to carry them because "people" believe lifters are the source of hemi tick. So vendors don't want to touch them, too many examples of brand new lifters causing tick. They'll sell you a cam, just not lifters. Imagine that is you, and 1/3 of your customers are pizzed because they put in new lifters and they tick. Like just punt and not carry lifters? I see their point, but they wont even carry mds delete kits/lifters either.

Here is cam thread. Amazon still sells lifters for now, few others do. One reason I really like amazon, much of the products they sell I simply can't get local. If it is lifters and cam those components are not the issue, look up lubrication strategies and do your best to protect the new ones. May not make you feel better but 180k miles on hemi lifters should be considered a success story. look up lifespan hemi lifters...

 

[blackbetty14]

Are you seeing metal in the oil/filter? I bet if you sent the oil out to blackstone you would see high metal and gas due to the lifter grinding away the came lobe then your dumping raw fuel past the cylinders or backing up if its an intake valve and moving elsewhere. Pull the valve cover and watch the rockers as you rotate the engine over... the one that moves less is the toasted one. You will still need to pull and check all as they have a tendancy to wipe out others when they go.