MAF sensor or Fuel Pressure Regulator going bad?
#1
MAF sensor or Fuel Pressure Regulator going bad?
So i've been trying to figure out what's been going on with my discovery, Any time i reach a hill, The disco has a tough time maintaining speed, much less accelerating; and the gas mileage has dropped to about 11mpg from 15mpg in town driving. I changed the spark plugs, fuel filter, air filter, oil, and nothing changed. Then did an induction cleaning, and cleaned the throttle body, still nothing. I was talking to someone and they suggested MAF sensor or the fuel pressure regulator going bad, probably the fuel pressure regulator. Any thoughts from you guys?
1998 Discovery
138,000 miles
1998 Discovery
138,000 miles
Last edited by herblatham; 01-03-2010 at 01:08 AM.
#2
If you know someone with a tester, there's a port on the fuel rail to test fuel pressure. You could try cleaning the maf with CRC maf cleaner(wouldn't use anything else). People will say not to, it will ruin it,but thats on the D2's with a bosch maf. I've done mine and if you follow directions, works fine. 6 months and hasn't died yet. Plug wires?
Last edited by kenk; 01-03-2010 at 09:57 AM.
#7
Got in to jacksonville today, and my check engine light comes on, and starts flashing. Had it checked out and it was a bunch of misfires and the crankshaft position sensor. I've read a bunch of threads on here dealing with crankshaft position sensor, and my disco has a lot of the same symptoms. You think i should still have the fuel pressure tested, or just replace the crankshaft position sensor, see where it goes from there.
#8
One reason I asked about your cold starts was because if it cold starts OK, there is a good chance it is not a fuel issue cause your pump is not bleeding down over night which can be the first indication of a failing pump.
Consider replacing the fuel filter and if still acting up, you may have a VSS failing, which is common and will cause what you are describing.
Consider replacing the fuel filter and if still acting up, you may have a VSS failing, which is common and will cause what you are describing.
#9
#10