P0304 misfire code

Reply Subscribe

Thread Tools

Search this Thread

Jun 6, 2018 | 07:47 PM

ThirdsACharm

Thread Starter

Tuned

Joined: Feb 2011

Posts: 265

Likes: 31

From: Fort Worth, TX

P0304 misfire code

I'm 700 miles into New sparkplug and boots on a 2011 ecoboost. Today at the tail end of my commute home, the truck couldnt accelerate, shuddered, and the pending code via my obdii reader was p0304.

I pulled the plug and checked the boot on cylinder 4 (first cylinder on driver side) but didn't see anything obvious wrong. I'll buy a new plug and boot tomorrow and see what happens. Anyone else see this sort of thing?

Side note, after putting evrything back together for the night the truck threw and ABS/check brake system code too. IM guessing vaccum pump because I noticed nearly no braking the first time I hit them recently, but I will take a look at that once the engine is back running right.

Jun 7, 2018 | 05:20 AM

tseekins

Super Moderator

Joined: Jan 2008

Posts: 40,003

Likes: 1,517

From: Maine, Virginia

A similar thing happened to me after I changed plugs and boots. 7K miles after, the #2 coil went out. No issues since then.

As for the vacuum pump, it's under warranty for 10 years or 150K miles from Ford. Take to any dealer, they'll settle it for you.

Jun 7, 2018 | 06:15 AM

ThirdsACharm

Thread Starter

Tuned

Joined: Feb 2011

Posts: 265

Likes: 31

From: Fort Worth, TX

Thanks Tseekins, I hadn't considered the coil may be bad. I'll replace that along with the plug and see what happens.

Jun 7, 2018 | 06:52 AM

ThirdsACharm

Thread Starter

Tuned

Joined: Feb 2011

Posts: 265

Likes: 31

From: Fort Worth, TX

... while I'm waiting for the parts counter to open, I'm told the F150 doesn't have a vacuum pump by the service advisor. And that's why I do all the work I can on my own. SMH

Jun 7, 2018 | 08:32 AM

ThirdsACharm

Thread Starter

Tuned

Joined: Feb 2011

Posts: 265

Likes: 31

From: Fort Worth, TX

I'm all set. She likes the new coil and plug. Thanks again.

Jun 7, 2018 | 05:01 PM

tseekins

Super Moderator

Joined: Jan 2008

Posts: 40,003

Likes: 1,517

From: Maine, Virginia

Quote:

Originally Posted by ThirdsACharm

... while I'm waiting for the parts counter to open, I'm told the F150 doesn't have a vacuum pump by the service advisor. And that's why I do all the work I can on my own. SMH

I recommend you find another dealer then, it's under warranty and they'll fix it.

Jun 7, 2018 | 05:20 PM

ThirdsACharm

Thread Starter

Tuned

Joined: Feb 2011

Posts: 265

Likes: 31

From: Fort Worth, TX

Quote:

Originally Posted by tseekins

I recommend you find another dealer then, it's under warranty and they'll fix it.

Eventually he did find it via VIN and was still a %%%% about it even after it stared at him in the face. So I won't go back there for the work. Hardly expect someone to know everything about every model year and model and component. But if I start the conversation, don't like being spoken to like I'm the idiot. Even IF I was wrong, just a bad customer service strategy. Now if only they'd order my headlight bearings...