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Discussion Starter #1
My 97 4.6L misses badly when accelerating. I replaced the plugs, have relatevely new wires too. I just replaced one coil pack and it solved the problem for a week or so. I will proceed to replace the other, as it is similar in symptom, but I cant believe that both went bad at the same time. The car does have 114K miles on it though, and they look to be original packs...

Any other suggestions while I wait for the new pack to arrive?

Thanks :)
Bob
 

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well your already replacing the other coil pack so id wait and see if that clears it up. when was the last time you changed your fuel filter?
 

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Have you checked for codes? If not, get them read, write them down and post.
Also you don't have to have a check engine light for codes to be present.

Chris................;)


There, that reads a little better.:rolleyes:
 

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Fry Rice Specialist
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you better be already cleaned the maf....:uppoint:
 

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just curious i have symptoms that are very close to what you are describing. i would like to know how you checked the coil packs and found out that they were the problem. my car has a bad miss during heavy acceleration..thanks
 

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Bob, could you elaborate on your problem? Specifically, what vehicle speed, engine speed, tranny gear, throttle position, and engine temperatures does it occur at?
 

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Discussion Starter #13
It would occour at any speed or gear, any engine speed or car speed, and any throttle other than the most light application to simply maintain speed. The car would miss, and you could easily feel it. I had already changed the plugs and wires recently, so it had to be the coil packs. I checked and there is no way that I could find to test your own coil packs unless you have special dealer like equipment. The packs were only $40 anyway.
 

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huh do the 96 an 97 have external resistors on the coil packs like the 95s ive read that these are not needed and cause coil packs to go bad when the resistor is bad just a thought out loud
 

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I have a rough idle and little bit of sputter coasting down the road like right when I let off the gas and part throttle to were the engine is just barely keeping tension on the trans. I think it might be my plugs but not sure. It all started after I put the UD pullies on. I had left the passenger side coil unplugged because it was in the way of the breaker bar for the belt tensioner. Well, I started the car and forgot about the coil being unplugged. It ran on 4cyl for about 5 sec and I quickly remembered that it was unplugged. After that it has a little bit of a rough idle and a little bit of sputter while coasting. I have NGK V-Power plugs gapped at .050 and did a file job by cutting back and rounding the electrode. It ran perfect before hand. It still runs great on acceleration. I was just curious if maybe I gas fouled the 4 that didn't fire a little bit. I also have the MSD coils, too.

Clay
 

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Fry Rice Specialist
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only gap at .050 instead of the minimum .054???
 
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