Untrained

Make that a big shake. My grandma noticed it when we started it up earlier, and it was bad. It cleared up really quickly though, so that tells me the O2 sensor are doing their job.

Untrained

I've been checking with the video about diagnosing a bad MAF sensor, but it is a bit difficult without a true voltage reading. I still havent been able to hook up a scanner, but I am leaning towards cleaning the throttle body. Even if it doesn't fix it, it wont hurt to get the 250k miles of gunk out of there right? I still need to hook up a scanner this weekend and get those fuel trim numbers.

RLXXI

Forget everything everyone has posted thus far and run a compression check on the engine. Both dry and wet and post the numbers.

While you have the spark plugs out, take a close up pic of the business ends and post that as well. Make note of what plug came out of what cylinder.
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Untrained

A wet compression test would be with fuel right? Spark plugs are a pain, but I'll get around to it, hopefully this weekend.

RLXXI

Based on that question/statement. Better take it to a trained technician if you want it fixed right as inexpensively as possible.

You can throw money at it all day (aka parts cannon) and never fix it.
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Untrained

OhioLariat

I think he's taking to this pretty well. He's Listening to recommendations, following through, and giving feedback. He won't learn more with comments like this.

Untrained - Take a look at THIS PAGE for an explanation of compression tests, how to perform them, and what the results can mean. It's not a difficult process. (Pulling the plugs is actually the hard part.) Autozone, Advance, or O'Reilly's should have a compression testing kit for loan. And yes, when you pull your plugs, make note of which cylinder each came out of. Color and condition of the plugs can identify improper mixture, oil fouling, and other problems. (I use a piece of 1x4 board in which I drilled eight holes, and wrote numbers next to to keep track of mine.)

Here's a video you might find helpful:

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Untrained

Thanks OhioLariat, that page really helped me understand the whole compression test thing. Just trying best I can to follow what people more knowledgeable than me say. I'll definitely try and get everything I need to do that. Would the easiest way be to remove the fuses for the fuel pump and injectors if there are any?

jprevat

iTrader: (1)

They are pretty easy to unplug as they sit nice and high in the engine bay.

Jbrew

Many years ago I put up a Ford C-test procedure at another site to help out....it's still there, -

https://www.f150online.com/forums/ar...ml#post4295903

Hope it helps.