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  #1  
Old 08-16-2010, 10:44 PM
n2spd n2spd is offline
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Default 5.7l Hemi is cutting out at high rpms

The truck is a 03' single cab Dodge Ram 1500 wih a 5.7l Hemi. 135000 miles. Driving the truck normal it drives great but If im driving around 40 mph and I accelerate hard, it cuts out when the rpms reach 4500. It will cut out and drop to 3500 and then kick back in again and so on. My first thought was it was not getting the right amount of fuel at the higher rpms but I was hoping someone on here might know before I start throwing parts at it. Thanks for your help.

Last edited by n2spd; 08-16-2010 at 10:51 PM.
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Old 08-16-2010, 10:54 PM
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If its cutting out it sounds more like an electrical issue, needs to go on the computer to get the best read on the problem. Fuel issues tend to be more hessitations in nature. With out putting it on a computer you will have as much luck as Hellen Keller picking out the right shade of red lip stick.
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Old 08-16-2010, 10:58 PM
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A fuel pressure problem is easy to confirm or rule out. Do a pressure, volume and leakdown test. If all is well there, I would start looking at the crank sensor.
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Old 08-17-2010, 03:55 PM
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both the above sound like very valid ideas. you may also want to check fuel filter, pump and spark plugs.
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Old 08-20-2010, 01:18 AM
n2spd n2spd is offline
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I have a hypertech programmer and I just put my truck back to stock settings the same day It started messing up. Im sure it has nothing to do with it but it seems odd to me. Im not getting any codes or lights but I will have it checked out anyways. Truck is still running great as long as you dont floor it. It doesnt idle rough,miss,or anything like that. I will keep you guys updated just in case someone else runs into the same problem. Thanks for your help.
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Old 08-20-2010, 01:21 AM
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Good luck! Let us know how it goes and if you find the problem.
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Old 09-06-2010, 02:25 AM
n2spd n2spd is offline
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Update on the truck. I have not had anymore problems untill today. Getting a P0300 code. Truck idles like crap and wont smooth out untill 2000rpm. Random missfire. Ordered a fuel pressure tester and Im going to clean the injectors so any other ideas.? Thanks
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Old 09-06-2010, 12:48 PM
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P0300 is actually a multiple cylinder misfire. Did you get any other codes such as P0301-P0308? If it's smoothing out at higher rpm's, I'm inclined to lean toward the ignition system.
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Old 09-07-2010, 02:07 AM
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I did a compression check today and got 180 psi on 2,4,6,8,1,3, and 5 was the winner. 0 compression. Anyone have a direct link to a write up on this. Seems like it might be easier to pull the engine.
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Old 09-07-2010, 03:41 AM
n2spd n2spd is offline
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I pulled the valve cover and the exhaust spring on the #5 cylinder is loose. The rest of the springs you cant turn by hand. Would that mean it is broke? Thanks for your help. Again Im getting no compression from the #5 cylinder. Thanks for your help.
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