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Old 08-08-2015, 12:33 AM
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Exclamation 5.7L surging under acceleration...help!

05 WK 5.7,limited awd. 73,000 miles. No check engine lights or anything (aside from a air bag light that I can't seem to get rid of)

We have had the Jeep for about a year and a half. I noticed even then a slight "surging" under acceleration. when we bought the jeep from the dealer they gave us the service history on it and I could see that it had a complete tune up at around 50,000 miles I believe it was (we purchased it at around 60,000 miles).

However lately the surging seems to be more pronounced. It runs great,idles great,in park/neutral it revs up quickly,it shifts through all the gears great. Around town it runs normally.

But when you accelerate quickly from a stop sign,to pass a vehicle in front of you,merge from an on ramp onto a highway or completely mash the accelerator,There is a definite "surge/chugging sensation" and at times the engine almost sound like it boggs in a way like it is not hitting the rpm's that it should or as quickly/smoothly as it should. The issue is present rather I am in tow haul mode or not,traction control off or on,manually shifting or automatically shifting. It doesn't ALWAYS seem to do this.....but a good 75% or more of the time it will do this....

The best way I could explain it would be almost like on a older carburetor car someone holding their hands over the carb throat slightly and opening and closing them over the carb rapidly under acceleration. almost like it is being starved maybe?...if that makes sense?.

The air filter is clean, I could not tell you if the fuel filter is original or not, I would assume the cats are fine or it seems like I would have other issues and/or a check engine light. The jeep otherwise runs good.

I am not sure if maybe this is a common issue that someone can steer me in the right direction on or if someone here has experience the issue and knows what the culprit is. But I would really appreciate the help on figuring this out. My family rides in the vehicle and I don't want to have to worry about it breaking down or something. I would like to solve the issue and be done with it finally.

Thank you in advance for the help guys!.

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Old 08-08-2015, 06:20 AM
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Re: 5.7L surging under acceleration...help!

I would start checking the fuel pressure and when ok, the exhaust back pressure, to see if there is no restiction in the exhaust.
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Old 08-09-2015, 01:37 AM
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Re: 5.7L surging under acceleration...help!

Ill look into it. Thanks

Anyone else have any ideas?
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Old 08-09-2015, 07:20 AM
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Re: 5.7L surging under acceleration...help!

Maybe an other item to check is the accelerator pedal position sensor. If you have a scanner with live data, you can see if the value changes proportionally with the movement of the pedal and that it doesn´t show any spikes.
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Old 08-09-2015, 08:01 AM
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Re: 5.7L surging under acceleration...help!

A '05 WK 5.7 with 70,000+ miles is quite a find. My 2010 had a similar problem until I installed an oil catch can, cost $98 bucks. Under heavy acceleration, the hemi sucks oil and the stock emission system forces it into engine through the throttle body. Now I am burning just gasoline and not a gasoline/oil mixture under heavy acceleration. My 2 cents.
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Old 08-09-2015, 11:19 PM
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Re: 5.7L surging under acceleration...help!

Quote:
Originally Posted by Frango100 View Post
Maybe an other item to check is the accelerator pedal position sensor. If you have a scanner with live data, you can see if the value changes proportionally with the movement of the pedal and that it doesn´t show any spikes.
I had also thought about that. I even went as far as looking into a TPS....when I realized that the throttle pedal on these basically controls what a TPS would on other vehicles. Then looked at the price.....and I am not willing to blow that kind of money on a guess lol. But yes I agree that it sounds like that COULD be part of the problem. First I will try other ideas/cheaper fixes and see if I can get it fixed. But I will definitely keep that in mind if I can't get it fixed before long and maybe I can get the accelerator scanned.

Actually, I have always thought the throttle pedal has felt kind of "weird"...not sure if it is related. I always just chalked it up to being use to cable driven systems and then switching to electronic drive by wire system. But I guess the best way to describe it is that the initial press of the accelerator seems to read correctly 0%-30% or so I would say but then there is a almost desensitized "dead zone" from say 30%-50% press of the accelerator. (its not that it isn't accelerating during this....just that the engines increase in rpm's doesn't seem to correlate with the amount of throttle input being given). And then when you give it more accelerator (50%-100%....its like it goes from cruising speed to what almost feels like smashing on the gas pedal and throws you into your seat).

Its not so much that it is kicking down into passing gear that I am feeling so much as it is I think feeling it not transitioning smoothly through the entire motion of throttle travel...like it skips from 30% throttle right to %50. Hard to explain, sorry if you cant understand what I am trying to put down lol.

But, I am not sure if that issue and the issue I originally posted about are related being that the original issue is mostly when accelerating to pass,get on highway,take off fast and such that is normally more toward the end of accelerator travel.
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Old 08-09-2015, 11:50 PM
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Re: 5.7L surging under acceleration...help!

Quote:
Originally Posted by cornax View Post
A '05 WK 5.7 with 70,000+ miles is quite a find. My 2010 had a similar problem until I installed an oil catch can, cost $98 bucks. Under heavy acceleration, the hemi sucks oil and the stock emission system forces it into engine through the throttle body. Now I am burning just gasoline and not a gasoline/oil mixture under heavy acceleration. My 2 cents.
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!
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Old 08-10-2015, 06:26 AM
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Re: 5.7L surging under acceleration...help!

Since you have a jeep, a scanner is almost a thing which must have come with it from the factory.
If you have a smartphone, you can get a cheap bluetooth or a bit more expensive wifi dongle of e-bay and download the free Torque app. You can then monitor many live data, like the throttle position. You can also see and errase DTC´s.
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Old 08-10-2015, 09:18 AM
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Re: 5.7L surging under acceleration...help!

I had a similar problem until I replaced crankshaft and camshaft position sensors. Not sure which (if either) was responsible. My vehicle did stall out once when doing this.

No code was set when this happened to me.

Other things to check that are common on the hemi (though wouldn't necessarily lead to exactly your symptoms...but could):

EGR valve
Throttle body
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Old 08-10-2015, 05:40 PM
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Re: 5.7L surging under acceleration...help!

Thanks for the ideas guys. Any one else with input please feel free to chime in.
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Old 08-11-2015, 01:24 PM
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Re: 5.7L surging under acceleration...help!

My 07 5.7L has done this since I bought it, from 50K to now 80K miles. It doesn't do it every time, but I'd say about 50% of the time, under full throttle I can feel the surging you described. I haven't really tried to diagnose it because it's random and only happens under full acceleration which I don't do every day. It's more of a nuisance than a serious problem.

I can say that after installing a catch can, and new crank position sensor that nothing has changed. My intake, filter and throttle body are all clean.

The only time I came close was when I replaced the front and rear diff fluid and the xfer case fluids. For about 5k miles after that I didn't really notice it much but now it feels the same as when I first bought it. It still pulls like a freight train so I simply ignore it when it happens.
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Old 08-13-2015, 11:47 PM
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Re: 5.7L surging under acceleration...help!

I noticed the last 2 days in a row when I was with my wife in the Jeep that on the first start of the day.....When you put the key in and crank the engine over it will " crank crank crank crank crank crank crank " for a good 5 or 6 seconds or so and then VROOM it first up and runs fine. It never use to do this.

After that, for the rest of the day from what I have noticed it always fire right up almost instantaneously after you start to crank the key (maybe 1 or 2 second long crank before it fires up).

Have also noticed when idling in park or in drive sitting still that the idle seems SLIGHTLY rough. but not enough to fluctuate rpm's on the tachometer. Just seems to not be QUITE as smooth as it use to be.

Not sure what it could be but I would hate for it to break down on her somewhere so I hope I can figure out what is going on before it gets any worse. Most of it hasn't got to the point that it is causing major issue....more so annoyances and I know it didn't use to do this stuff so it is bugging me and I want to fix it.

Anyone have any ideas.
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