AJamesR
New Member
- Joined
- Sep 26, 2007
- Messages
- 7
- Reaction score
- 0
- Points
- 0
- Age
- 39
- Vehicle Year
- 1994
- Make / Model
- Ford
- Transmission
- Automatic
I have a 1994 Ford Explorer that I put a 92 explorer engine into a while back. My problem is this: sometimes it starts and runs perfect, but other times it doesn't start at all, if I turn the key on and hear the "hum" of the fuel pump then I know it'll start, but if I turn it on and don't hear that it doesn't start.
I've tried a lot of things and figured stuff out that just confuses me more. first when I turn it to the "on" spot normally the check engine light will come on until it's started, but the times the pump doesn't turn on the light doesn't come on either. I bought a new Fuel pump Relay, and it didn't change anything, however I know now that if I have the key on and it won't start I can get out and tap the relay and it'll click and then I hear the fuel pump and it starts, however often when I do this I'll drive about a mile and it'll just die on me, until I do it again.
And the other thing the confuses me more, is I know if you unplug the fuel pump safety switch so the fuel pump doesn’t come on, the engine will start and run for a little while before it runs out of gas and dies, but when it's having this problem where I don't hear the fuel pump turn on, it won't start at all, like there's no spark or whatever.
I'm wondering if this could be a problem with the PCM but if it is, it doesn't make since to me why taping the fuel pump relay would cause it to start. Is there a ground wire for the PCM or fuel pump I can check. And does anyone know where the PCM is on the 94 explorer? The book says it's on the firewall on the left side and I can't find it there for the life of me. Thanks
I've tried a lot of things and figured stuff out that just confuses me more. first when I turn it to the "on" spot normally the check engine light will come on until it's started, but the times the pump doesn't turn on the light doesn't come on either. I bought a new Fuel pump Relay, and it didn't change anything, however I know now that if I have the key on and it won't start I can get out and tap the relay and it'll click and then I hear the fuel pump and it starts, however often when I do this I'll drive about a mile and it'll just die on me, until I do it again.
And the other thing the confuses me more, is I know if you unplug the fuel pump safety switch so the fuel pump doesn’t come on, the engine will start and run for a little while before it runs out of gas and dies, but when it's having this problem where I don't hear the fuel pump turn on, it won't start at all, like there's no spark or whatever.
I'm wondering if this could be a problem with the PCM but if it is, it doesn't make since to me why taping the fuel pump relay would cause it to start. Is there a ground wire for the PCM or fuel pump I can check. And does anyone know where the PCM is on the 94 explorer? The book says it's on the firewall on the left side and I can't find it there for the life of me. Thanks
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