rob2337
Member
- Joined
- April 25, 2005
- Messages
- 43
- Reaction score
- 0
- City, State
- Montreal
- Year, Model & Trim Level
- 95 XLT 4x4
I have a 95 Explorer 4x4 4.0L. Every so often when I go to start the truck, it just keeps on cranking and doesn't catch. I have tracked the problem down as far as I can go and now I am stuck. When it doesn't start, I know that the fuel pump doesn't work. This is because the fuel pump relay does not engage. I did some checking with a voltmeter and when the problem occurs, the voltage that is supposed to be 12v from the pcm relay to the fuel pump relay is only like 3.5v....not enought to engage the relay(the -12v signal from the pcm is present). All the wires from the pcm relay to the fuel pump relay are good. The pcm relay is also used to give +12v to the MAF, injectors, pcm, etc. I am suspecting that there is somthing wrong with one of these things and it is shorting to ground. That would explain my voltage drop. One last thing, when the voltage is at 3 volts then jumps back to 12 volts, I can hear a slight click somewhere in the engine bay. Not as loud as a regular relay. Can't figure out what the heck it is. Injector sticking and shorting to ground, bad PCM, ...???? Pain in the but problem.... Any sugestions where to look before I start ripping apart the wiring harness and probing wires?