Engine Performance problem
1993 Mercury Topaz 4 cyl Front Wheel Drive Automatic 78000 miles
When car is cold ( I live in NY ) it starts right up all the time and runs smooth but cannot drive it for ten minutes, even in park if you step on the gas pedal it cannot rev up if in gear it has no power it wont stall but you go very slow. Once car has warmed up it runs fine but then I will be driving at 60 and it drops down to 30 I pull over and shut it off for 2 minutes then start again and away I go. The high speed problem ocurs once or twice a day in a 15 mile run somtimes not at all. Ive checked fuel pressure and it is 50 psi. I left gauge connected and watched while I drove around block when cold same symtoms pressure stayed steady. I replaced fuel filter ignition coil, plugs, wires, cap & rotor. I checked throtle position sensor with ohm meter and its smooth and steady.I have no codes or check engine light I think it may be the mass air flow sensor even though I have taped on it with no change in idle run
have the same problem?
Tuesday, March 3rd, 2009 AT 6:54 PM