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1998 Volvo S70 engine trouble

Tiny
LOCKIE
  • MEMBER
  • 1998 VOLVO S70
  • 2.4L
  • 5 CYL
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
My 1998 s70 volvo starts and runs for about 5 minutes, then it dies and will not restart for about 2 hours, or it cools off.I replaced fuel pump, fuel pump relay, fuel filter, air idle control valve, ignition coil and module. It still done the same thing, so I checked for fuel and fire, it had fuel and fire.I let the car cool down and restarted it and checked the vacum to the fuel pressure regulator while it was idling. It had no vacum to the fuel pressure regulator, so I checked all the vacum lines. The vacum lines were in great shape, no leaks. Is there some way I can bypass the vacum canister and run vacum straight to the fuel pressure regulator with out damaging the fuel pressure regulator, Please give me your thoughts and any other tips I might use to correct my problem
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Wednesday, November 5th, 2014 AT 3:35 AM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,139 POSTS
If you have spark and fuel, it should run. Tell me, have you checked to see if there is power to the fuel injectors? Also, is the spark a hot blue snapping spark?
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Wednesday, November 5th, 2014 AT 7:01 AM
Tiny
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The spark is hot and blue, it has power to the injectors, but its not getting enough fuel to run.
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Thursday, November 6th, 2014 AT 8:05 PM
Tiny
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I have good blue spark and fire to the injectors. Not getting enough fuel to run.
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Thursday, November 6th, 2014 AT 8:14 PM
Tiny
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Okay, if you have spark, the injectors are getting power, but you don't have enough fuel pressure to run the engine, either you got a bad pump, there is a plugged fuel filter, the hoses were put on wrong at the tank, the fuel supply line is bad, or you have a regulator that is bad and not allowing fuel pressure to build.
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Friday, November 7th, 2014 AT 6:15 AM
Tiny
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I have no vacum to the fuel pressure regulator. The vacum lines are fine, no leaks, there is just no vacum. Why do I have no vacum?
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Friday, November 7th, 2014 AT 10:41 PM
Tiny
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  • MECHANIC
  • 108,139 POSTS
If the vacuum hose doesn't have vacuum, there has to be a leak or it is disconnected. However, removing the vacuum supply to the regulator will increase the pressure. The problem has to be either a plugged fuel filter, bad pump (even though you replaced it), or the hoses are on wrong at the tank.
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Saturday, November 8th, 2014 AT 6:54 PM
Tiny
LOCKIE
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  • 5 POSTS
Fuel filter is fine, fuel pressure is good, it runs to good then just dies. Its got to be something warmin up then dieng
could it be the computer shutting it down?
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Saturday, November 15th, 2014 AT 4:44 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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When it dies, do you then lose pressure? If so, have you checked the fuel pump relay?
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Saturday, November 15th, 2014 AT 5:08 PM

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