98 f250 5.4 wont start after replacing the top end of mottor

Asked by Mechanic101 Oct 30, 2018 at 02:14 PM about the 1998 Ford F-250 3 Dr XL 4WD Extended Cab SB

Question type: Maintenance & Repair

We have a 98 f250 5.4 we were losing
compression so we've replaced nearly everything
on the top of the motor. Just got finished putting it
back together and it wont start. It will crank but not
start... any ideas??

3 Answers
27,570

oilyspill answered 6 years ago

Battery has a full charge and connections all good? Engine cranking, you have compression--spark at the plugs-- proper fuel pressure--fuel injector pulse? Any applicable trouble codes? I haven't checked about your security system?

Mark helpful
40,015

beatupchevy answered 6 years ago

you need to test for proper fuel pressure and spark , something may have gone bad by pure coincidence while the work was being done , I would think the rings would be suspect when compression is lost

Mark helpful

Your Answer:

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