04 Mercury Grand Marquis

Asked by mark Aug 30, 2020 at 04:21 PM about the 2004 Mercury Grand Marquis LS Premium

Question type: General

Rebuilt fuel pump, replaced crank and cam sensor, still no fuel to injectors, also
replaced fuel filter, squirt gas into throttle body runs a bit but very rough even at
wide open throttle, any ideas on this?

2 Answers
41,220

TDolby answered 4 years ago

Did you check the fuel pressure yet? It could be the fuel pressure regulator if the pressures don't come back within spec?

Mark helpful
35,325

lrodri911 answered 4 years ago

Determine the cause by foolowing troubleshooting procedires vs guessing. First find out if it's gasoline supply issue by checking fuel pressure at the rail. If pressure is low, concentrate on fiel supply like the pump, filter, leaks etc. If fuel pressure is ok, connect to live data read computer and see if crank sensor is pulsing and see why ECM not sending signal to fuel injectors

Mark helpful

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