98 taurus spark problem
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98 taurus spark problem
I finished changing engine in my 1998 taurus 3.0. the fuel pump would not kick in when I turned key on, further investigation found no spark. It does crank over and every thing else seems to work. anybody have any Idea what to test? boy I miss the days of my 78 f250.
Last edited by woodsmaster740; Feb 2, 2007 at 01:25 PM.
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I was pretty thorough with the plugs. Im sure every thing is hooked up. On a hunch from a buddy I changed crank position sensor ( I know test first ) but to no avail. I had bought the haynes book, but the color of the wires don't seem to match.
I also noticed the check engine light does not come on when I turn the key on.
I also noticed the check engine light does not come on when I turn the key on.
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From: Frequently frozen MN
Just a primitive thought. maybe your PCM is dead. Had a problem with my 89 F150 -- turned out to be a bad power connection to the PCM.
This is not as absurd as it sounds.
TFI ignition will fire without the PCM, but NOT with a dead PCM loading it down.
Obviously no injector pulse
And, of course, no CEL
Just a thought,
ford2go
This is not as absurd as it sounds.
TFI ignition will fire without the PCM, but NOT with a dead PCM loading it down.
Obviously no injector pulse
And, of course, no CEL
Just a thought,
ford2go
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I have a parts car and I tried using the PCM out of that, it didn't do anything different. Testing the PCM connector is one thing I have not done yet. I was able to make the fuel pump work by jumping a wire at the power distribution box but that does not do much good if there is no spark. Do you know how to test the PCM connector?
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Had to park the car outside and pull my sons 95 f-150 4x4 5spd extend a cab in. His slave cylinder is leaking. I am glad its a straight six. When it rains it pours.
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Cargo Master
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From: Frequently frozen MN
When I had a problem, I could see a spark if I disconnected the one pin connector. This is the one that you're supposed to disconnect to set the base timing. The deal is ( I think your ignition still works this way), that the PCM is supposed to modify the timing by putting some feedback on this wire.
If the PCM is dead, it loads this wire, which prevents any spark. Disconnecting the connector lets the TFI make the basic spark.
On my F150, there was a relay that sent power to the PCM. It was actually the connection to the relay coil that was bad. I don't know if yours is the same. You just need to somehow see if the PCM is getting 12 V and ground.
- You can probably just measure it on the connector since you know how to take out the PCM.
- Besides the relay, I imagine that there's a fuse.
Good Luck,
ford2go
If the PCM is dead, it loads this wire, which prevents any spark. Disconnecting the connector lets the TFI make the basic spark.
On my F150, there was a relay that sent power to the PCM. It was actually the connection to the relay coil that was bad. I don't know if yours is the same. You just need to somehow see if the PCM is getting 12 V and ground.
- You can probably just measure it on the connector since you know how to take out the PCM.
- Besides the relay, I imagine that there's a fuse.
Good Luck,
ford2go
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Cargo Master
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From: Frequently frozen MN
When I had a problem, I could see a spark if I disconnected the one pin connector. This is the one that you're supposed to disconnect to set the base timing. The deal is ( I think your ignition still works this way), that the PCM is supposed to modify the timing by putting some feedback on this wire.
If the PCM is dead, it loads this wire, which prevents any spark. Disconnecting the connector lets the TFI make the basic spark.
On my F150, there was a relay that sent power to the PCM. It was actually the connection to the relay coil that was bad. I don't know if yours is the same. You just need to somehow see if the PCM is getting 12 V and ground.
- You can probably just measure it on the connector since you know how to take out the PCM.
- Besides the relay, I imagine that there's a fuse.
Good Luck,
ford2go
If the PCM is dead, it loads this wire, which prevents any spark. Disconnecting the connector lets the TFI make the basic spark.
On my F150, there was a relay that sent power to the PCM. It was actually the connection to the relay coil that was bad. I don't know if yours is the same. You just need to somehow see if the PCM is getting 12 V and ground.
- You can probably just measure it on the connector since you know how to take out the PCM.
- Besides the relay, I imagine that there's a fuse.
Good Luck,
ford2go
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I got the boys truck going again, those 4.9's are great to work on. I have the haynes book I will try and figure which wire feeds power and which one grounds the PCM. There is about 30 pins for the PCM connector. What 1 pin connector are you refering to ?
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Ahh.. would have helped us a lot to know you were using the harness from the other engine (I'm assuming it was a used assembly)...
Next time you post it'll help a LOT to include this sort of information.
Oh well, at least you got it running. Congratulations!
Next time you post it'll help a LOT to include this sort of information.
Oh well, at least you got it running. Congratulations!
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