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Old 01-07-2013, 08:48 AM   #1 (permalink)
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Default P0305 Mis fire on #5 cylinder

Hey Gang:
I've been on X-mas vacation and traveling through the Rocky Mountains when I got a P0305 MIL. I did some research about the P0305.

When I got my P0305 MIL the engine wasn't under a load, I was going down the back side of a hill foot off of the accelerator.

Since I was traveling I got gas at various locations.

I want to get to the root cause why the P0305 tripped.

Only thing I can think of right now is bad gas (water in fuel), the coil pack or vacuum leak.

Right now I'm thinking vacuum leak or intermittent coil pack. If it is a vacuum leak can anyone give a list of the top 10 locations to check on a 1997 Duratec engine?

My Motorcraft spark plugs have 30K miles on them. Thanks.

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Old 01-07-2013, 09:17 AM   #2 (permalink)
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Vac. leak(s) should trip po171/174 lean codes. Most common 1 on your eng. is the upper u-shaped pcv hose directly under the throttle body. Check/replace plug(s), wire(s) or coil for misfire code(s).

Last edited by sheila; 01-07-2013 at 09:20 AM.
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Old 01-07-2013, 09:37 AM   #3 (permalink)
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Do you have a scan tool with you that will show fuel trims? If so, they will tell you if you have a vacuum leak or not.
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Old 01-07-2013, 10:33 AM   #4 (permalink)
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Well it probably isn't a coil because coils either don't work at all, or have issues under load. It would probably miss under load as well if it was a coil. (or am I wrong?)

I agree check fuel trims, but you probably don't have a vacuum leak if you don't have the P0171/141 like Sheila said.

Go ahead and read the misfire sticky, should help you out: How to Understand and Diagnose Misfires
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Old 01-07-2013, 05:47 PM   #5 (permalink)
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PCM runs a misfire check when you're coasting. It would probably be fuel or vacuum related.
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Old 01-07-2013, 11:28 PM   #6 (permalink)
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Quote:
Originally Posted by behlinla View Post
PCM runs a misfire check when you're coasting. It would probably be fuel or vacuum related.
behlinla:
I think you nailed it. I've cleared the P0305 code and it hasn't returned. I'm going to look for the elbow piece beneath the throttle body and check for cracking / dry rot. Thanks gang.

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