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Michael, Auto Service Technician
Category: Car
Satisfied Customers: 919
Experience:  21yrs.Foreign and domestic driveability diagnosis and repair/ ASE Cert./Fuel Injection Specialist.
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1988 ford f250: engine cranks wont turn..vapor lock..problems related

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1988 ford f250 7.5L engine cranks wont turn over, was having vapor lock problems. are problems related? whats causing engine to not turn over?

Do you mean it will not start?or it will not turnover(Crank)???

Customer: replied 11 years ago.
it cranks. will not start

You need fuel pressure,Spark,Air and Injector pulse for it to run.You need find out which you are not getting.I will give you the Fuel pressure specs below.To check injector pulse you will need a noid light(pictured below)Also check for spark at a plug wire.let us know what you come up with.Is there a check engilight lit? if so you need to retrieve codes from the computer.


For your 1988 FORD TRUCK F250 3/4 TON P/U 2WD:


The pressure regulator reduces fuel pressure to 39-40 psi (269-276 kPa) under normal operating conditions. At idle or high manifold vacuum condition, fuel pressure is reduced to approximately 30 psi (207 kPa). Check to make sure that the Vacuum hose to this is not full of fuel!It's located on the fuel rail.

Wilmar Noid Light Set — 6 Piece

Michael and 8 other Car Specialists are ready to help you
Customer: replied 11 years ago.
Reply to Michael's Post: thanks. it's sounds to complicated for me. i'm going to take it to a shop. thanks 4 your help.