99 3.0 runs really rough.
#1
99 3.0 runs really rough.
stumped on this one. its had the 401 code for quite awhile without issue but now it is running really rough and is very low on power.
we replaced the spark plugs which were pretty much completely worn out electrodes worn down to the porcelin and it ran great for a week then the stumbling came back. We replaced the egr and dpfe and the codes are not reappearing so far but it still runs terribly.
When I checked the fp the guage only showed 25 psi. we replaced the fuel filter and now fuel pressure is 55psi. but it still runs really rough. No codes.
What do we do next?
we replaced the spark plugs which were pretty much completely worn out electrodes worn down to the porcelin and it ran great for a week then the stumbling came back. We replaced the egr and dpfe and the codes are not reappearing so far but it still runs terribly.
When I checked the fp the guage only showed 25 psi. we replaced the fuel filter and now fuel pressure is 55psi. but it still runs really rough. No codes.
What do we do next?
#5
#6
yeah they really go bad, really. If they never went bad we would never need to replace them. It might not set any codes either.
#7
Yep clogged injector will deffenitly cause it to run ruff. So id clean those out and sea foam the intake as well, my ranger ran alot soother after i ran sea foam. And yeah plug wires can go bad and same with the coil pack. But test each plug for spark and that will well u if its that or not. And i dont think it would thro a code unless it was the coil pack. But just test for spark and see whats what
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#11
I need a cliff to drive this thing off! I had one plug that was arcing out to the head, (i could see sparks around the plug) so I moved it to the next cyl and it did the same thing in that hole so I replaced the plug and its better but still not right. argh I guess I will replace all the plugs again and swap out wires, then go to coil. I will also put some injector cleaner in too, I guess seafoam brand.
#12
Ok hold up. Iv had the best luck with the lucas EFI cleaner. That will clean ur injectors. The Sea foam will clean out the valves, intake and tops of the pistons not so much the injectors but idk it might. But if the injectors are so dirty that there maken the motor run ruff id take them out and clean them with BRAKE cleaner. because the EFI cleaner works really good but over time like on tank of gas. It sounds like ur needed to fix it quick
#13
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FordCigarMan
1987 - 1996 F150 & Larger F-Series Trucks
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06-26-2017 08:28 AM