steve392

Have you replaced the 4 oxygen sensors? If yes and if it is the cats, might as well do it custom, will probably be cheaper then oem cats which are like $700 each side.

steve392

Sorry to ask this, but could you give us a list of what you have done already in terms of replacing/repairing?

number20

I've just started taking things into my own hands after my long time mechanic pissed me off - and sucked at keeping this thing running.

So far, all that has been done is cleaning the throttle body and seam foam through the gas tank.

Cleaning the throttle body had immediate results... for two days. It ran smooth for 2 days and then went back to the stumbling at idle.

The sea foaming seemed to have immediate results as well... both good and bad. It seemed like the idle speed would actually adjust, but there was a lot of surging.

The Timing Chain and phasers were done around 80,000. I'm at 135,000 right now.

I just did an oil change and I'll probably do another one quickly. I'm fighting a lot of sludge, but after reading it seems like it has a lot to do with A LOT of short drives and the truck not getting up to temp.

Hopefully, this weekend I'll be doing the following. I already have the parts and necessary tools ready to roll - including the Lisle.

1. Air Cleaner
2. Fuel Filter
3. Spark Plugs
4. Check hoses around TB for leaks
5. New gasket foam on Airbox cover.
6. Check throttle body again.

That is the simple stuff.

I think I may have an exhaust leak, too.

I did pick up a decent OBD II reader - the Actron CP9575.

When I do erase the codes, it will go for about half a day before throwing errors again. It seems like restarting when hot throws the codes.

Regardless of the code situation, it doesn't idle well when hot and it lacks power frequently.

From my research, the O2 Sensors typically are misdiagnosed because the problem is further up the line, but in this case the P2272 makes it seem like it could be an O2.

Once I get done with the stuff above I'll run it for a day and see what happens. I'm already thinking about the O2s and the Fuel Pump Driver Module.

Thoughts?

number20

Update...

Reset the codes last night. Drove home. Started it this morning and drove the kids to school (5 miles). Turned it off while I walked them in. Nothing was set off.

Got back in and turned it on. No codes yet. Started driving back to work and about 3 miles later I got 0171, 0174 and 0060.

Thanks,
Josh.

steve392

Your going to get the codes till the problem or problems are fixed. Definitely do that list you got going.

Do you have an exhaust leak where the exhaust manifolds meet the downpipe/catalytic converters? If so that will cause that 0171/0174 code possibly.

steve392

Also, have you cleaned the mass air sensor itself? These things were notorious for getting dirty. You have to be super carefull if you do it, the metal wire that measures the air is super fine. I use to use eletrical contact cleaner from crc and qtips soaked in it. Carefully rubbing the sensor to get the dirt off of it. Also did this to the idel air sensor the same way.

number20

Not sure about the exhaust leak. I haven't confirmed this.

I did clean the MAF sensor - just sprayed with CRC MAF cleaner. I did not do the q-tips as I have read that it shouldn't be touched at all.

From what I have read, there is no idle air sensor on the '04 to '08 style F-150s.

dnlow

Thanks for the write up. I have been wanting to do this for a couple years now. I always thought it would be fairly easy, just not this easy.

ProZach

Glad I could help

Eco Tuner

When your removing the TB to clean it, are you looking into the intake manifold with bright light? Look cab in a ways and see if you have oil puddling on the bottom. If so, this is causing issues (and dirties the TB rapidly from the reversion pulses pushing the oil onto the TB blade and bore). The next few that do please take some picture and post them.