V6 (1994-2004) MustangsTechnical discussions on the 3.8L and 3.9L V6 torque monsters Sponsored by Optima Batteries
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Hey all, I just purchased a 2004 Mustang V6 3.9L.....
Heres the story. Got it home and it was idling rough at about 30-40 mph - took it to O'reillys to check for error codes (check engine light did come on). did have a couple error codes as in Cyl 3 was missing. I replaced the engine coil with a new one I purchased at O'reillys.... At this point it got bad. The car now wouldn't even get power enough to make sound like it was going to turn over.
So, I put back on the old coil thinking the new one may just be bad. Now, I did number the plugs so they would go back on the same.... So, here I'm scratching my head - the darn car won't turn over at all now! It sounds like it might (which is better than the new coil sounded) but it just wont turn over! UGH.
Any ideas what may be going on?
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Okay. Let's clear some things up first. Idle is only what the car does at a complete stop without touching the gas. When you say turn over you mean start? That's actually two different things. When you turn the key does the motor spin at all? That's turning over.
Have you checked the plugs? Could be a whole list of issues.
Go for a full tune up, plugs, plug wires, fuel filter, air filter, see what that does.
When buying a coil never buy the OEM spec replacements, only ever get Motorcraft or a respected brand like MSD. I'm at work at the moment so I can't get to my car to give you a wire layout for the coil.
04 3.9l Convertible- Daily driver
94 5.0l Convertible- Work in progress
92 5.0l Hatchback- Another work in progress
Yes, that is correct. It will turn... That's the strange part - it started up before messing with the engine coil. I've checked the plug wires again and again, I've reset the ECU, I replaced the battery and cleaned the conections, I've checked all the fuses twice, I reset the relays, I've double checked the fuel cut off button in the back.....
I guess the next thing to do is to check the spark plugs for spark along with the engine coil just to make sure.... I'm running out of time - I may just have to break down and tow it to the shop....darn.
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