R3ject3d23

Well, my 07 F150 went a full year with no real issues until recent. I started noticing that if I was at a low RPM (~1100) in fourth gear and slightly increased the throttle, the truck will buck until I push the gas pedal further, forcing it to downshift. It also doesn't seem to have the same get up and go. My immediate guess was transmission but then I noticed that I had unburnt fuel in my exhaust pipes when I had it on a lift doing a brake inspection. I'm thinking its an o2 sensor thats choking out the engine since it's running rich but before I start tearing into that nightmare I wanted to know if anyone else has had this problem and that theres not something way more simple that I'm not thinking of. Thanks in advance!

Summers22

iTrader: (2)

How many miles? Its my experience O2 sensors aren't the best after 75-100k. You only need to replace the 2 upstream closest to the exhaust manifolds. When was your last tune-up of plugs and coils as well as fuel filter change and throttle body and MAF cleaning? If your original O2 sensors have over 75k, they need replaced anyway for optimal gas mileage.

R3ject3d23

I just hit 172,000 this weekend. I bought it at 152,000 from a used car dealer who got it at an auction so I have no idea when or if the previous owner did a tune up on it. It could use a new fuel filter and a throttle body/MAF cleaning, I just haven't had time to get to it between going to college full time and working almost full time hours. From what I've seen the passenger side upstream is the biggest pain in the rear out of the four sensors. I was originally just going to pull all four and check and replace any that were bad but it would be midnight or later before I finished after getting off from work/school

Eric0508

if you haven't done spark plugs yet, they are almost certainly the cause of your issues. Look up some of the replacement threads and get them changed.

Martian

Plugs, coils, boots, springs. Now, before you have to replace the cats.

Soundcolor

Mine was doing the exact same thing. Pulled the spark plugs and coil packs... the electrode was completely worn down from every single plug, coil packs seemed fine. I swapped in new plugs and put in new coil packs, solved the problem immediately.

It was the most difficult spark plug job I've very done.

A few tips I learned along the way.

1. Disassemble everything you need to get to the spark plugs but done remove them. Soak them overnight in pb blaster or some other penatrating oil.
2. Buy the broken spark plug removal tool, if you buy it you probably won't need it, if you dont, you will. Murphys law.
3. If you have one, use a cordless impact to break the plugs loose. Less rotational force on the plug, less likely chance of breaking one. Don't just hold the button down tho, just hit it a few times slowly until the plug starts turning then finish removing with a ratchet.
4. Work from back to front, passenger side first. Gets the hard ones out of the way first
5. Use a quality nickel anti-Semite in the new plugs.
6. Clean the **** out of the heads spark plugs holes. I used a copper wire brush from a gun cleaning kit to get any and all trash from the threads.
7. Keep a small vacuum handy to keep from dropping any **** in the cylinders.

Go slowly and it'll be fine.

Martian

Racist.

Soundcolor

Bwahahahahahha. Autocorrect wins again..

Seize, anti seize

R3ject3d23

Haha gotta love auto correct! Thanks a bunch for the info, I have Thursday off so I'll probably just go ahead and replace the plugs, it can't hurt either way I guess!

Martian

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