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mtnman1224's avatar
mtnman1224
Explorer
Jul 09, 2014

Hard Starting

When engine is warm, difficult starting, cold starts fine, but when warm will crank for 8-10 seconds before starting. had a complete tune up, all filters, new plugs and wires, but did not solve problem. Any ideas?
  • On that year 454 it is either leaky injectors or bad fuel pressure regulator. The original injectors leak down and flood the engine when hot. Buying new injectors of the same type will not help. You can either buy Lucas injectors new or Bosch injectors for the ford mustang used to fix this issue. Other than that you can live with it. I have a 2000 454 and so far I am living with it. If I ever need to take the plenum off I will buy the lucas set. They are about 325-350 for the set of 8. Also if the plenum ever comes off replace the fuel pressure regulator and check that distributor.
  • If year is in the 2000+ check out the crank position sensor. Year and engine would be a great help.
  • Try starting it without ever touching the accelerator. Don't give it that startup pump.