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  #13  
Old 08-16-2015, 12:35 AM
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Re: 5.7L surging under acceleration...help!

A few days ago on the first start of the day. Before I started it, I cycled the ignition from off to on 5 times . I then started the Jeep and it fired right up without hesitation. The last 2 days in a row on the first start of the day the Jeep has started up just fine on the first key turn without hesitation aswell.

I wouldnt think it is fuel pump/pressure related as it likely would not be an issue that would come and go. Which leads me to believe maybe crank/cam sensor maybe?. Im just throwing rocks in the dark hoping to hit something at this point lol.

I am planning on doing a full tune up soon and also replacing items that may be common problems so I can have a better chance of fixing whatever issue it may have and also the peace of mind of knowing all of those things have been done and won't have to be worried about for some time. (plugs,wires,egr valve,air filter,crank sensor,cam sensor,map sensor,pcv valve,fuel filter...etc...etc..).

Just wanted to toss that little update out there. If anyone has any input please feel free to chime in. Thanks

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  #14  
Old 08-16-2015, 02:40 PM
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Re: 5.7L surging under acceleration...help!

Quote:
Originally Posted by XxSNOTRODxX View Post
Thanks, I was planning on putting one on it eventually because it seems to be a common mod for all the hemi's. But I wouldn't think its sucking enough oil to make it run oddly. But I have seen stranger things lol. thanks.

Anyone else have any ideas?. The more the better!
Here's a quote from a post on another Jeep forum by Mike at Diablosport, the tuner manufacturers.

"No, this is where I comment on lost power due to oil contamination in the intake tract/combustion chamber. I will assure you that after having seen as many logs of as many HEMIs as we have here at DiabloSport, not to mention the numerous HEMI vehicles we have had on our dyno for R&D, I can say, without a doubt, that the HEMI's PCV/Oil Vapor control is the worst of anything we deal with. All you have to do is pull your intake manifold to see the puddles of oil collected in there, and realize that it eventually gets in the combustion chamber, and oil don't like to burn, thus, detonation occurs.

There is no gimmick here. HEMI's have KR issues. The KR issues are 99% of the time contributed to by oil contamination in the intake charge, reducing the effective octane in the combustion chamber, and leading to a loss of performance.

Plenty of people have seen solid power gains on even stock vehicles when getting rid of an oil issue by adding a catch can that works properly."
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Old 08-17-2015, 01:09 AM
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Re: 5.7L surging under acceleration...help!

I've noticed it loses about maybe 1/16th of a quart of oil in 4,000 miles or so. So I am sure it has some of the hemi oil consumption but I don't think it is enough to change how it would run. I had a ram years ago that had a bad valley pan gasket and sucked 3 quarts of oil into the cylinders in one day ( not a typo lol) and it still ran like a raped ape.

Not saying a catch can isn't a good mod to have, It is definitely on the list of things to get. I just don't think that is the cause of these problems. (not ruling it out, just looking to exhaust other possibilities first).
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Old 08-24-2015, 03:12 PM
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Re: 5.7L surging under acceleration...help!

Decided to do a few things as preventative maintenance and if it fixed the issues in the process than awesome and if not....atleast I know they have been done.

Did an air filter because it was due for a new one. Installed a new camshaft position sensor, installed a new crank shaft position sensor and installed a new EGR valve.

I haven't noticed any extended cranking on start up as of yet but the issue was sporadic to begin with so I will continue to monitor it. I notice the throttle response does seem to be a little better. BUT I do still notice that the surging seems to still be present.

I heard that the cam and crank position sensors were known for going bad and I heard the egr valves are known for failing within 50k miles....in which case mine was 20k miles overdue anyhow. And it needed a new air filter so I don't think any of it was a waste.

Removing the egr was dumb. They put the alternator right in front of one of the mounting bolts for the egr and requires removing the alternator. I didnt want to mess with all of that so I backed the bolt out as far as it would go and then used a rotors bit on my dremel tool and cut the bolt off. Then the egr valve came out and what was left of the bolt backed right out by finger as it was only hanging on by a couple threads. When I installed the new egr I used a slightly shorter bolt so I wont run into that issue in the future need I ever have to do an egr valve again.

While I had the old egr sitting next to the new egr valve I did measure the ohm resistance of the two. And there was a couple of terminals that varied in ohms. one of the terminals was about .3 lower than the new egr and the other terminal was about .7 lower than on the new one. As to what that difference means during operation I don't know....but it was lower than the new egr none the less.

Next on the list I suppose I am going to do a set of plugs and wires and go from that point.
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