Slight driveability problem
Well, I have had zero engine problems with my truck (97 F150 4.6L) up until now and I just hit 130,000 miles, so I have been lucky. I am having what I think is an engine problem but not sure. Here's the problem.
At about 1200-1400 RPM I get this surge or miss ( can't decide what it is doing) feeling in the truck. Best way I can describe it is to say it feels like a loaded trailer getting slack and then tightning back up. Kinda of a jerking feeling. No check engine or trans lights are coming on yet, and when the feeling of the surge hits the RPM's DO NOT change. It seems to only happen when I get up to 40-50 mph and overdrive kicks in and drops the RPM's down to the 1200-1500 range and I keep a steady throttle to stay within this speed/RPM range (kinda where the engine is bogged down a little, right before it should shift down), although I did feel it once with OD off at around 1800 RPM. I can let off the throttle and push back down and all is fine or I can just push down on the throttle a little harder and engine perks right up and runs fine.
I did a little full throttle test tonight on a long hill and the same problems appreared but a much worse rate along with the pinging nosie I am trying to figure out. I may be wrong but the two might be related. Another thing to point out is that my pinging really only happens in cold (below 50* or 40* weather) and that type of weather is when I noticed this problem also.
So far I am in the early stages of fixing this and have no real clue where to start. The plugs, wires, and fuel filter have about 22000 on them, so I wouldn't think it to be them misfiring as that would throw a code. I have been told that it could be the early stages of the fuel pump on it's way out (hope not). Any ideas out there because I really would like to get this figured out?
Sorry for the long post but I feel too much detail is better than not enough.
Lost and confused
Last edited by KYFordFreak; 11-22-2001 at 11:46 PM.