1995 Mercury Marquis Lincoln 4.6 engine swap

Tiny
KRAZYKRITTER
  • MEMBER
  • 1995 MERCURY MARQUIS
Electrical problem
1995 Mercury Marquis V8 Two Wheel Drive Automatic

I have a grand marquis I ran up almost 300,000 mi on, God bless it the rings gave out. I wasn't going to fix it but I picked up a 4.6l engine that came out of a 93-94 Lincoln for $200. Well the engine is replaced, all hooked up and plugged in. The problem is the engine turns, gets good compression, but won't start. The only clue seems to be the 50A fuse (#9) under the hood keeps popping when I crank it. I 'v rung it out for a short but can't find anything. It ran before the engine swap it just spit oil into the upper cylinders. I suspect the Lincoln wire harness and chassis wiring has something incomparable, my old harness was swiped by the junk scraper while I was at work. If something can be rerouted or changed that would be great but I don't have that kind of detailed wiring info, just the little from a Hayes Manual. So I'm looking to the pros because I mechanically work on industrial motors, controls, generators, ect. For a living. I work on cars when I have to.
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Monday, April 26th, 2010 AT 12:33 PM

3 Replies

Tiny
RACEFAN966
  • EXPERT
OK first off I need the engine code off the side of the block it will be F. This will let me know which 4.6 you picked up. Now on the other note look for any wires that may have gotten pinched between the block and the trans and or engine mounts etc. Now I do need to know did you swap the intake manifold and such from the original engine to the replacement? Let me know how the swap was done.
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Tuesday, April 27th, 2010 AT 9:52 AM
Tiny
KRAZYKRITTER
  • MEMBER
You were on the right track but, I already resolved the problem. The ignition had a previous failure and had been modified. A wire in the ignition harness got intermittently shorted to the dash frame. The recent engine swap and the wire wearing through were only a coincidence. I had realized later the problem had to be a shorted ignition wire so I started tracing out the wire that went to that fuse. When I was checking the wire color on the ignition block I found a wire worn through. I was going to rerun the wire but I got lucky and just repaired it. Thanks for your effort and keep the donation. I will be posting another question about the ac system and a plug that does not match up to the pressure cut off switch, because the ac compressor won't come on now. I will be posting the question after I get a little more information and maybe a photo. If you are pretty familiar with the 4.6L Fords then feel free to respond if you see it posted.
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Tuesday, May 4th, 2010 AT 11:05 PM
Tiny
RACEFAN966
  • EXPERT
Ok great glad to hear it is fixed and running. Now on the A/C question ask away as soon as you are ready just reply to this post and we wil take it from there. It may be just a switch change or compressor change or? We will find out.
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Wednesday, May 5th, 2010 AT 11:19 AM

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