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help needed desparately

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Old May 27, 2017 | 01:53 PM
  #31  
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need help desperately

Thanks for all your help. If I get it running will let ya know.
 
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Old May 27, 2017 | 02:55 PM
  #32  
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Originally Posted by GoinBoarding
confirm if 45 psi KOEO fuel pressure is adequate for an 87' 4.9L?
45-50 PSI is spec. 45 PSI is plenty under idle condition.
 
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Old May 27, 2017 | 11:09 PM
  #33  
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A possible cause could be a failing coolant temperature sensor, or failing TFI module/Ignition coil.
 
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Old May 27, 2017 | 11:38 PM
  #34  
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Originally Posted by Lead Head
A possible cause could be a failing coolant temperature sensor, or failing TFI module/Ignition coil.
Could you explain how/why a coolant temp sensor would affect the fuel delivery? I had issues with a hot restart, replaced mine, and all is good. I erroneously thought it was an ECM shutdown, but was informed the ECM does not have this capability. So, how does the coolant temp sensor fit into the equation? I'm not doubting one bit it does, I just want to know how it does. Thanks.
 
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Old May 28, 2017 | 12:12 AM
  #35  
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Originally Posted by one_bolt_short
Could you explain how/why a coolant temp sensor would affect the fuel delivery? I had issues with a hot restart, replaced mine, and all is good. I erroneously thought it was an ECM shutdown, but was informed the ECM does not have this capability. So, how does the coolant temp sensor fit into the equation? I'm not doubting one bit it does, I just want to know how it does. Thanks.
The coolant temperature directly controls temperature-related fueling. Cold engines need more fuel than hot engines.
 
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