Engine lack off power 60kph top speed

[glenn_a]

Hi, Just wondering if anyone out there could help me... I have a FRIEND and need a help for his 1998 Ford Explorer SOHC which lacking of power, he say's he replaced AIR FLOW METER + SPARK PLUGS + FUEL PUMP + FUEL FILTER + CRANK ANGLE SENSOR + CHECKED EXHAUST SYSTEM + CHECKED TRANSMISSION & still hard starting from first time and lacking power when he drove it and top speed only 60kph...
NO ERROR CODE on the SCANNER...

please help!

 

[8111870]

Check for blocked catalytic converters.

 

[glenn_a]

Check for blocked catalytic converters.

thanks! but that's been checked already and its all good...

 

[8111870]

Fuel would be all thats left. Check the pressure at the rail on startup , idle and 2000 rpms

 

[SoNic67]

If he replaced the fuel pump and filter, it might have a clogged fuel line. Does it have a fuel pressure port?

 

[koda2000]

what year did the FPR move to inside the fuel tank? I believe in 1998 it was still on the fuel rail. worth checking.

 

[glenn_a]

If he replaced the fuel pump and filter, it might have a clogged fuel line. Does it have a fuel pressure port?

he say's that the first thing he checked and replaced fuel filter andthe pump and the pressure is all good never drop...

 

[glenn_a]

what year did the FPR move to inside the fuel tank? I believe in 1998 it was still on the fuel rail. worth checking.

what is the FPR?

 

[glenn_a]

he was thinking maybe its the transmission problem before, when he had this problem the car only runs around 25-30kph and it backfires plus hard starting...
but then he started replacing the fuel pump and filter and so on then it went a little better so now we think it not the transmission....