Hi Scotty. Thank you for taking my question. I have a 2005 Dodge 1500, with the 4.7 engine, 211,000 miles. I bought this truck new. It has been a very good truck and it would cost bundles to replace. However, I have got a real problem. It will start and drive okay until I reach 58MPH and then start up a hill on the interstate or highway. I can feel the engine start to stumble, then vibrate, the check engine light starts blinking, and the speed drops off. The cruise control tries to maintain the set speed and will pull the accelerator all the way to the floor. I get the same results, except the movement of the accelerator without the cruise control on. I put my scanner on it and all it reads is "multicylinder misfires" and code P0300. I changed all the coils and plugs. I took compression reading. But the problem remained. Now for some reason, Dodge service centers will not work on any vehicles over 10 years old. (Sucks) So i took it to a local shop that has given me good service before. The best guess was the fuel injectors. They were replaced. Still have the same problem. I replaced the PCM, the CMP sensor, and the CKP sensor. It still has the problem. The shop said the fuel pressure readings were good. I feel that the fuel pressure is dropping off when driving and it needs a new pump/filter and the lines blown out. The shop also checked the converters, and they were okay.
Do you have any thoughts?
Dodge service centers will not work on any vehicles over 10 years old. (Sucks)
They're too busy fixing their new junk XD
Your truck is one of the last years of decent quality from dodge (obviously, given its age & mileage).
I bet its the fuel pump. Sounds like classic misfire due to lack of fuel, and assuming the new injectors are functioning properly, I think it has to be the pump (unless you have a very clogged fuel filter).
"A weak pump may deliver enough pressure and flow for low-speed driving but “starve” the engine of fuel when engine speed and load increase, causing the engine to misfire, hesitate, or even stall." - FCP euro blog
I feel that the fuel pressure is dropping off when driving and it needs a new pump/filter and the lines blown out.
I suspect this too.
If you can have the fuel pressure analyzed while driving around that could confirm this theory before you spend anymore $.
