2008 5.7 Hemi missing at low rpms
#1
2008 5.7 Hemi missing at low rpms
Sorry for the wall of text below but I wanted to explain everything I could.
I bought a 2008 Quad cab automatic 4x4 with the 5.7 hemi a little over a week ago with 10600 miles on it. I noticed that the truck has a miss that is very easy to feel in the 1500-2000 rpm range. I have checked for codes and none are stored and the check engine light is not on. The miss is there at any speed, as long as the rpms are low I can feel it vibrate and you can hear the engine chugging from the exhaust. It almost feels like I am running on 7 cylinders. It also seems to be related to where I have the throttle positioned. If I push it past a certain point it seems to even out (which also usually pushes it past 2000 rpms though).
I took it to the dealer and they diagnosed it as a seized clutch fan. They put a new one in today and said problem solved. On the way home the computer was telling me I was getting 15.4 mpg, which is better than the 12.1 it was stuck at since I bought it. Now the fan appears to work as intended but it didn't fix my strange miss.
I picked up a boat today (maybe 3000 pounds or so) and the truck was really having a hard time pulling it. I could barely get up to speed on an incline and the miss seemed to be there the entire time.
So, I figure that the miss is always there but not as easy to feel once rpms get past 2000 rpm and the truck isn't hauling something. The truck seems pretty powerful to me but that is coming from someone whose last vehicle was a Jeep Grand Cherokee with the big 4.0 . Has anyone had a similar problem? It is under warranty and it might be quicker to point them in the right direction rather than have them throw parts at it until it works.
I bought a 2008 Quad cab automatic 4x4 with the 5.7 hemi a little over a week ago with 10600 miles on it. I noticed that the truck has a miss that is very easy to feel in the 1500-2000 rpm range. I have checked for codes and none are stored and the check engine light is not on. The miss is there at any speed, as long as the rpms are low I can feel it vibrate and you can hear the engine chugging from the exhaust. It almost feels like I am running on 7 cylinders. It also seems to be related to where I have the throttle positioned. If I push it past a certain point it seems to even out (which also usually pushes it past 2000 rpms though).
I took it to the dealer and they diagnosed it as a seized clutch fan. They put a new one in today and said problem solved. On the way home the computer was telling me I was getting 15.4 mpg, which is better than the 12.1 it was stuck at since I bought it. Now the fan appears to work as intended but it didn't fix my strange miss.
I picked up a boat today (maybe 3000 pounds or so) and the truck was really having a hard time pulling it. I could barely get up to speed on an incline and the miss seemed to be there the entire time.
So, I figure that the miss is always there but not as easy to feel once rpms get past 2000 rpm and the truck isn't hauling something. The truck seems pretty powerful to me but that is coming from someone whose last vehicle was a Jeep Grand Cherokee with the big 4.0 . Has anyone had a similar problem? It is under warranty and it might be quicker to point them in the right direction rather than have them throw parts at it until it works.
#2
I would agree the mis is likely there when on the gas as well, it is more eveident at lower speeds because MDS is kicking in and your issue is with one of the 4 cylinders that run during MDS mode.
Plug, wire or coil would be my first guess. If you are truely getting a mis fire you should throw a code for it within 50-100 miles of the issue starting.
Do not go crazy of this though, just take it in. If it is the obvious they will be able to fix it. Warranty is a wonderful thing.
Plug, wire or coil would be my first guess. If you are truely getting a mis fire you should throw a code for it within 50-100 miles of the issue starting.
Do not go crazy of this though, just take it in. If it is the obvious they will be able to fix it. Warranty is a wonderful thing.
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Good tuner for that vehicle
The company I work for makes a good tuner for your vehicles.
https://www.sctflash.com/Products/un...nce-programmer
I'm a web developer for them, and I have a 2005 JGC 5.7L that is having serious issues with cutting out between 1500 and 2200 rpms in all gears. I have to floor it to get it out of that range. I brought it in to the dealership for a diagnostic, so we will see what they say.
I love the thing, but if I don't get this figured out soon, I am gonna trade it in on an f-150 4x4
https://www.sctflash.com/Products/un...nce-programmer
I'm a web developer for them, and I have a 2005 JGC 5.7L that is having serious issues with cutting out between 1500 and 2200 rpms in all gears. I have to floor it to get it out of that range. I brought it in to the dealership for a diagnostic, so we will see what they say.
I love the thing, but if I don't get this figured out soon, I am gonna trade it in on an f-150 4x4