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V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters
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Old 10-25-2011, 10:36 PM   #1
Rapscallion Stallion
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Question Why? Misfire in cylinder 1.

2002 Mustang V6 Coupe
105,000 6spd

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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Old 10-25-2011, 10:42 PM   #2
jthorn9
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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.
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95 Mustang SVO - 400 RWHP 400 TQ sold
08 Mustang GT - 285 RWHP 305 TQ sold
99 Mustang Cobra - 280 RWHP 290 TQ sold
11 Mustang V6 - 270 RWHP 260 TQ sold
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00 Mustang V6 - 145 RWHP 184 TQ sold
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Old 10-25-2011, 10:47 PM   #3
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Thanks a lot!
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Old 10-25-2011, 10:52 PM   #4
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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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Old 10-25-2011, 11:39 PM   #5
Daehawk
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Motorcraft only.
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Old 10-26-2011, 09:09 AM   #6
jthorn9
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Use motor craft for the coil pack. Probably the best thing out there for all V6s except those in excess of 350 hp.

For plugs I like NGK v copper plugs. Really good quality plugs that are exremely durable and resistant to rust. Motor craft is good but does get rusty over time.
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13 Mustang GT CS - 380 RWHP 370 TQ
13 Mustang V6 PP - 270 RWHP 260 TQ

95 Mustang SVO - 400 RWHP 400 TQ sold
08 Mustang GT - 285 RWHP 305 TQ sold
99 Mustang Cobra - 280 RWHP 290 TQ sold
11 Mustang V6 - 270 RWHP 260 TQ sold
97 Mustang GT - 190 RWHP 250 TQ sold
00 Mustang V6 - 145 RWHP 184 TQ sold
98 Mustang V6 - 125 RWHP 210 TQ sold
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Old 10-26-2011, 09:09 AM
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02, 08, 1, 2001, 39l, cly, cylinder, fox, gt, gt40, ignition coil, location, misfire, missfire, mustang, plug, spark

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