Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

cold starts

Old Jun 22, 2005 | 10:13 PM
  #1  
htrdss's Avatar
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Joined: May 2005
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From: pomfret ct
Car: 84 4x4, 86 iroc 67 chevelle
Engine: 350, 305 TPI, 327
Transmission: 4sp, auto, 4sp
cold starts

in the morning i have to crank the hell out of my 86 iroc tpi but once its warm starts fine
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Old Jun 23, 2005 | 04:48 PM
  #2  
Danno's Avatar
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Joined: Aug 2001
Posts: 1,896
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From: Warrington, PA USA
Car: "02 z-28
Engine: LS-1
Transmission: 4L60E
Long crank time can be caused by a bad fuel pump relay. When you turn the key on, no crank, cold, have someone listen at the fuel tank for the 2 sec prime. Generally you hear a whine as the pump ramps up to speed. If you don't have prime what is happening is the oil sender unit has a sw inside for the fuel pump also-the pump has 2 sources of power. When you crank it cold the oil needs to get to 4-5 psi then the sw in the sender closes turning on the pump. Try cleaning the fuel pump relay socket and the relay pins with some contact cleaner, many times thats all it is. Welcome, Dan
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