Donnyj
Platinum Member
There is 2 3.0 engines. One is the 12 valve engine, the other is the 24 valve engine. The 12 valve engine is the easier of the 2.
Actron OBDII Scanners
- Thread starter Jarrett
- Start date
- Views: 4288
OP
Jarrett
Silver Member
Well today the shudder or "miss" became pretty constant. Me and my father-in-law took the car to Advance Auto and had them scan the computer. It came back with a "cylinder 1 misfire" code, I forget the code number. The guy at Advance cleared the code. On the way home the care ran great. By the time we got home, it had started again, but only at take off. We pulled the #1 plug and found it had a couple cracks in the ceramic. The plugs (and wires) only have about 25-30k on them. They're replacement Motorcraft Platinum plugs. Made another trip to the parts store and bought 1 new plug. Put it in and the problem's still there. Tested the resistance on that plug wire. It came back at 9900 ohms. My FIL said it should have about 5k ohms per ft. Does that sound right? I don't know. Then we decided to test the coil pack as described in the Haynes manual. It said the primary resistance should be 0.5 ohms on each of the three pins of the coil pack conector. We read 0.8 ohms on each. The Haynes manual said the secondary resistance should be 13,600 ohms. We read 11,660 across #1 & 5, 11,440 across #3 & 4 and #2 & 6. We have a Taurus just like this one at work and tomorrow I'm going to test the coil pack to compare. Does it sound like that may be the problem?
OP
Jarrett
Silver Member
Well I tested the coil pack on the Taurus at work today. The primary resistance was 0.7 ohms and the secondary resistances were 13,110 ohms for 3&4, 13,060 ohms for 2&6 and 13,090 ohms for 1&5. So that's definitely different than my wife's car. Of course they're 2 different model years and the coil packs look a little different physically.
OP
Jarrett
Silver Member
Update: I ended up replacing the coil pack. It solved the misfire. However it's still not running right. It's running rough at idle, feels sluggish, and has a surge feeling around 45-55mph. The surge is nothing new. It had that last summer then seemed to go away, but now it's back. The fuel mileage isn't as good as it was. I'm thinking maybe we need to have the fuel system/injectors cleaned. I checked the injectors with a stethescope while running and they were working. I guess we're going to bring it to the dealership tomorrow. I don't really want to bring it there (bad experiences), but I don't know any good independent shops around here. Plus I'd really like to fix it myself, but we need to get this thing fixed.