96, 4.6L misfiring

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cbrown2

New Member

Oct 1, 2004

4

0

0

San Francisco, CA

Oct 4, 2004

#1

• Oct 4, 2004

• #1

My car has been misfiring for several days now. It is most noticable when I am in 5th gear and begin a grade on the highway. I changed the plugs and wires and had no improvement. I pulled the diagnositc codes and found "p0303, cylinder 3 misfire" and p0304, cylinder 4 misfire" Can anyone give advice as to my next step?

 

1tirefire

New Member

Jun 2, 2004

118

0

0

Northern Bay FF/SS

Oct 4, 2004

#2

• Oct 4, 2004

• #2

Maybe check your coil packs.

 

C

cbrown2

New Member

Oct 1, 2004

4

0

0

San Francisco, CA

Oct 5, 2004

#3

• Oct 5, 2004

• #3

What are coil packs, where are they located and how do I install them? Is there an easy way to search archives of this forum so that I don't ask redundant questions?

 

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TNstanggurl

New Member

May 27, 2004

153

0

0

TN

Oct 5, 2004

#4

• Oct 5, 2004

• #4

coil packs

They are the things that your plug wires are hooked up to on the left and right.They serve the same purpose as a distributor.They are not hard to replace at all.

 

bierbelly

Dirty Old Men Need Love Too

Founding Member

Oct 17, 2001

1,598

4

58

Sterling, VA

Oct 5, 2004

#5

• Oct 5, 2004

• #5

Wild guess...either a leak in your exhaust system upstream of the O2 sensors, or a bad O2 sensor.

 

PG98GT

Founding Member

Apr 5, 2001

687

0

0

Mt. Carmel, TN

Oct 5, 2004

#6

• Oct 5, 2004

• #6

Have you made sure your plug wires are fully seated on both the plug and coil packs? Seen a corroded coil pack end cause a misfire, so check it for corrosion. Are they stock plug wires? Maybe you have a bud that'll let you try their good #3 and #4 plug wires? Hope it's not the coil packs because the #3 and #4 are connected to different coil packs.