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Old 02-14-2014, 20:12   #1 (permalink)
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P0300,P0301,P0302,P0303, P0316-Taurus2005 Vulcan

aurus2005 Vulcan, almost 100k miles, rough idle, hard to accelerate, and hear like clicks from near the gas pedal when try to accelerate, the codes: P0300,P0301,P0302,P0303, P0316.
It looks like the problem popped up when it became cold. What's my first step to address this? Thx!
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Old 02-15-2014, 06:57   #2 (permalink)
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Re: P0300,P0301,P0302,P0303, P0316-Taurus2005 Vulcan

In case you didn't look them up, all are misfire, 300, random, 301-303, cylinders 1, 2 and 3, and 16 is at start. If the coils are original, they may be at the end of life. I recommend when replacing a coil, replace them all, since they pretty much share the same load and their life span is pretty much the same. Check plugs and wires, if they are original, or have been their for a while, they may be due. I would definitely start with pulling the plugs. Their condition can tell you if your just getting poor spark or if something else is causing the deterioration of your fire.
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Old 02-22-2014, 10:47   #3 (permalink)
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Re: P0300,P0301,P0302,P0303, P0316-Taurus2005 Vulcan

The spark plugs and coil are good.
Can feel and hear clicks when pressing gas pedal attempt to accelerate. The car then slows down and makes surfing like about to stall. Throttle body pro?

Thx

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Originally Posted by CatSkinner View Post
In case you didn't look them up, all are misfire, 300, random, 301-303, cylinders 1, 2 and 3, and 16 is at start. If the coils are original, they may be at the end of life. I recommend when replacing a coil, replace them all, since they pretty much share the same load and their life span is pretty much the same. Check plugs and wires, if they are original, or have been their for a while, they may be due. I would definitely start with pulling the plugs. Their condition can tell you if your just getting poor spark or if something else is causing the deterioration of your fire.
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Old 02-22-2014, 18:45   #4 (permalink)
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Re: P0300,P0301,P0302,P0303, P0316-Taurus2005 Vulcan

Not sure what could be causing the clicks, could be coincidental. Anything that I can think of from the throttle body that would show up in the plugs. Lean would throw a code, as well as rich, and rich would show up in plugs. Which plugs are you running?
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Old 02-22-2014, 18:58   #5 (permalink)
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Re: P0300,P0301,P0302,P0303, P0316-Taurus2005 Vulcan

Based on the codes, the 4 5 6 plugs on the front bank are running good, the 1 2 3 plugs on the rear bank are misfiring.

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Not sure what could be causing the clicks, could be coincidental. Anything that I can think of from the throttle body that would show up in the plugs. Lean would throw a code, as well as rich, and rich would show up in plugs. Which plugs are you running?
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Old 02-22-2014, 21:28   #6 (permalink)
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Re: P0300,P0301,P0302,P0303, P0316-Taurus2005 Vulcan

what's the difference between the front bank and rear bank of this engine?
Thanks a lot

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Not sure what could be causing the clicks, could be coincidental. Anything that I can think of from the throttle body that would show up in the plugs. Lean would throw a code, as well as rich, and rich would show up in plugs. Which plugs are you running?
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Old 02-23-2014, 06:54   #7 (permalink)
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Re: P0300,P0301,P0302,P0303, P0316-Taurus2005 Vulcan

Nothing, the spark signal is pretty much intertwined in a paired fashion:


At this stage, I'd be looking for coolant leak from the intake manifold, a mis-wiring, or wrong plugs. I've got 5.0 in my truck, cylinders 3 & 4 misfired like crazy and cylinder 2 occasionally, all on the same bank. In reality, all 6 of your cylinders could be misfiring, but the other bank is not as frequent so not throwing a code. If you know which brand and style plugs you have, might want to ask around and see if anyone else has a good or bad opinion for them in your application. In the mean time, look for signs of coolant loss and wiring issues. You can have the wires on the right plugs, but, due to induction from the wires they're next to, can cause a misfire (had that problem once, too)
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Old 03-06-2014, 19:40   #8 (permalink)
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Re: P0300,P0301,P0302,P0303, P0316-Taurus2005 Vulcan

Got new codes today: P0300, P0301, P0303, P0304, P0352, P0353, P0174
Took out the coil pack, and found 4 cracks, replaced it. Hope the problem has been fixed, while do not understand why P0174 came out? Vacuum leak there? Thanks!

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Originally Posted by CatSkinner View Post
Nothing, the spark signal is pretty much intertwined in a paired fashion:


At this stage, I'd be looking for coolant leak from the intake manifold, a mis-wiring, or wrong plugs. I've got 5.0 in my truck, cylinders 3 & 4 misfired like crazy and cylinder 2 occasionally, all on the same bank. In reality, all 6 of your cylinders could be misfiring, but the other bank is not as frequent so not throwing a code. If you know which brand and style plugs you have, might want to ask around and see if anyone else has a good or bad opinion for them in your application. In the mean time, look for signs of coolant loss and wiring issues. You can have the wires on the right plugs, but, due to induction from the wires they're next to, can cause a misfire (had that problem once, too)
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Old 03-16-2014, 13:35   #9 (permalink)
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Re: P0300,P0301,P0302,P0303, P0316-Taurus2005 Vulcan

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Originally Posted by peteryjg2008 View Post
Got new codes today: P0300, P0301, P0303, P0304, P0352, P0353, P0174
Took out the coil pack, and found 4 cracks, replaced it. Hope the problem has been fixed, while do not understand why P0174 came out? Vacuum leak there? Thanks!
The P0174 set because the rear bank was misfiring so much it sent all the air in the cylinders down and out the exhaust unused for combustion hence the high o2 content and fake lean condition.
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Old 03-16-2014, 17:34   #10 (permalink)
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Re: P0300,P0301,P0302,P0303, P0316-Taurus2005 Vulcan

Woulda never thought of that. I'll muddle that someplace between the ears.
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