V6 (1994-2004) MustangsTechnical discussions on the 3.8L and 3.9L V6 torque monsters Sponsored by Optima Batteries
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Hello. About six months ago I started getting a slight misfire. I didn't think a thing about it so I kept driving. It would only happen rarely when my engine was under a load. Then it started getting worse. My car wouldn't accelerate at all without jerking violently and the check engine light started blinking so I had it checked. Misfire in cylinder 1. No problem, right?
I had no clue when the plugs and wires were last changed so I decided to change them all. All new plugs and wires.
The problem seemed to be fixed temporarily. Most of the jerking was gone but when I tried to accelerate at low RPMs (2,500 or less) I still get the consistent jerk maybe twice a second. I thought maybe my injectors were clogged so I put some seafoam in the tank and also put it in my brake booster hose and let it sit. Some white smoke came out the tailpipe but not too much. I put seafoam in the tank a maybe 5 or 6 times a year so I don't think my injectors are ever really too dirty.
But still, when accelerating at RPMs any less than say 2,500, I get a constant shutter/jerking. What else could it be? I checked the gap on my plugs before I put them in. All new plugs and wires. Clean injectors.
I ran a search and found that maybe the ignition coil (distributor) was going bad. Perhaps it's ruining my plugs making it exponentially worse? Is the distributor that black box where the 6 plug wires plug into? Beyond plugs and wires, I know little else about the spark and what could cause a misfire. Is the ignition coil a common problem with the Mustang? Any brand recommendations or can I pick one up from a scrap yard from any v6 Ford?
Any help you could give me would be greatly appreciated. Thanks a lot!
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As you have assumed, odds are the problem lies with the coil pack. Your car doesn't have a distributer and ignition coil, instead both are combined in what's called a coil pack. Change that and the misfire should be fixed.
While shopping, does brand really matter that much? American Muscle has Screamin Demon for $100. O'Reilly has Motorcraft for $108. Then there are the generics for around $70. Or I can pull one from a salvage yard. Anybody have any recommendations?
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