Engine Performance problem
1990 Ford F150 6 cyl Four Wheel Drive Automatic 160000 miles
i have a 1990 ford 150 with a 4.9 and EFI. Its getting harder and harder to start in the mornings. I checked for vacuum leaks and found none. I checked fuel pressure, key on and engine running, and it holds 50 psi with key on and a little higher when running. I replaced the MAP, IAC and coolant sensor. I but a new EGR valve on it a week ago but it was getting hard to start before that. The plugs are good and the cap and rotor plus the plug wires are pretty new. It also feels like it is surging a little at highway speeds. It idles perfect when warm and starts up great when warm. The surging and hard cold starts are what im trying to figure out. I also did a wiggle test with the code reader and nothing wrong there. Any ideas on where next to look.
have the same problem?
Wednesday, September 23rd, 2009 AT 7:19 PM