Final troubleshooting for Ford 460 motorhome, advise?
Hello again everyone!
Been a while since I got a post up concerning the major work I have been doing on my 1988 gulfstream motorhome with the ford 460 7.5L V8.
I was very successful finally in getting the reman crankshaft and new bearings installed, as well as oil pump, oil pan, and other parts listed below over the last 2 months.
I am now to where the engine will start well, idles fairly well (maybe not perfect) and revs well returning to idle rpm correctly. It has been an insane battle to get to this point every step of the way. Haha
Almost all of the issues are resolved now. The new oil pump fixed the oil pressure issue, the new crank and bearings are running smoothly, and the issue starting when the engine is hot seems like it was the fuel pressure regulator I replaced.
Seemingly the final issue I am facing is a lack of accelleration and power when starting from a stop. Not that the engine isnt trying, it sounds like it is trying to climb a hill. Understandably this is an 11,000 lb motorhome fully loaded, but I am talking craaaawling from a stop until I hit at least 15 or 20 mph and then it seems to level out and stop working so hard for so little and run better. There seems to be a strong rich exhaust smell afterwards as well which leads me to assume incorrect air/fuel mix for one reason or another. The fuel pressure regulator fixed the issue not turning over when hot, but the lack of power from a stop remains. Doesnt sound like misfires or any lurching in speed, just lack of. The issue does seem more prevalent once the engine has warmed up, but I feel even from cold start it isnt quite what it should be.
I just patched a small leak in the EGR system just prior to the EGR valve, as well as cleaning the valve itself (it wasnt that dirty) but havent had a chance to run it since.
Through researching it sounds to me most likely to be either EGR, fuel pump or filter, fuel injectors, or possibly an ignition coil issue (though the engine starts just fine now) maybe I am missing something but what do y'all think would be tbe next best step?
I will list all the parts replaced in the last 2 months below:
Crankshaft
Main bearings
Rod bearings
Oil pump
MAP sensor
PCV valve
Purge valve solonoid
Checked and replaced any problem vacuum hoses
Starter
Battery
Fuel pressure regulator
All spark plugs
All plug wires checked
Timing checked
All new seals for pans and covers
Full fluids change with Lucas additives
Been a while since I got a post up concerning the major work I have been doing on my 1988 gulfstream motorhome with the ford 460 7.5L V8.
I was very successful finally in getting the reman crankshaft and new bearings installed, as well as oil pump, oil pan, and other parts listed below over the last 2 months.
I am now to where the engine will start well, idles fairly well (maybe not perfect) and revs well returning to idle rpm correctly. It has been an insane battle to get to this point every step of the way. Haha
Almost all of the issues are resolved now. The new oil pump fixed the oil pressure issue, the new crank and bearings are running smoothly, and the issue starting when the engine is hot seems like it was the fuel pressure regulator I replaced.
Seemingly the final issue I am facing is a lack of accelleration and power when starting from a stop. Not that the engine isnt trying, it sounds like it is trying to climb a hill. Understandably this is an 11,000 lb motorhome fully loaded, but I am talking craaaawling from a stop until I hit at least 15 or 20 mph and then it seems to level out and stop working so hard for so little and run better. There seems to be a strong rich exhaust smell afterwards as well which leads me to assume incorrect air/fuel mix for one reason or another. The fuel pressure regulator fixed the issue not turning over when hot, but the lack of power from a stop remains. Doesnt sound like misfires or any lurching in speed, just lack of. The issue does seem more prevalent once the engine has warmed up, but I feel even from cold start it isnt quite what it should be.
I just patched a small leak in the EGR system just prior to the EGR valve, as well as cleaning the valve itself (it wasnt that dirty) but havent had a chance to run it since.
Through researching it sounds to me most likely to be either EGR, fuel pump or filter, fuel injectors, or possibly an ignition coil issue (though the engine starts just fine now) maybe I am missing something but what do y'all think would be tbe next best step?
I will list all the parts replaced in the last 2 months below:
Crankshaft
Main bearings
Rod bearings
Oil pump
MAP sensor
PCV valve
Purge valve solonoid
Checked and replaced any problem vacuum hoses
Starter
Battery
Fuel pressure regulator
All spark plugs
All plug wires checked
Timing checked
All new seals for pans and covers
Full fluids change with Lucas additives
