Kraken207

2004 Heritage 4.2, MT, 4X4 (I post here since there is more similar with the '03s than the non-heritage 04s).

Ok, I made a previous post, and got some good feedback. Here is an update of what I've done, what I'm seeing, and what I'm thinking I'll do next.

• Replaced ignition manifold, all 6 spark plug wires, and all 6 spark plugs. Double checked all wire connections to manifold and plugs.
• Replaced upper intake gaskets, and isolator grommets.
• Cleaned MAF. Cleaned both downstream O2 sensors (in hindsight I should of also done the upstream sensors, see the "to do" below).

Performance wise is better than before the grommet replacement, so I think that was definitely a cause of a leak, but I'm still getting the 0171 code, and now I'm getting the P2195 code.

First, I'm confused on what to do about the 301 and 303 (misfires). If those were resolved, I don't "think" I'd be getting the 300 and 316, but maybe I'm off base with that. I can triple check everything, but I feel like they are solid.

For the lean fuel issue, I'm thinking the MAF needs replacement? I already cleaned it. I am also thinking I'll pull the upstream O2 sensors and clean them as well.

Performance was much better today on my drive into work, so I was really bummed when I saw all the codes.

Any insight is appreciated.
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white89gt

Did you clear the codes, and they came back?

Your issues are all on bank one. I would be looking for vacuum leaks on that side. Your MAF isn't going to be your issue here.

Kraken207

Maybe the upstream O2 sensors on that side?
When I pulled the upper intake manifold and pulled all the connections I checked them all thoroughly and they reconnected well.

Any other problematic components on that side? The 1 and 3 cylinders are on the same side.

white89gt

So, I assume you removed the intake manifold? Did you get the bank one rod put back on properly for the IMRC?

Kraken207

Funny you say that. I googled the IMRC after reading your comment.

I did not remove the lower intake, just the upper from the lower. However, I did not visually inspect the rod or bushings mentioned in the video.

Sounds like I should do what I did yesterday, and inspect that rod and those bushings.

Thoughts?

Kraken207

Also, didn’t clear codes second time, since battery was disconnected and the light went away, is it possible the codes were lingering and needed to be cleared. To be clear, did work, started truck, no codes until about 25 mins into drive.

Looking at a new IMC valve online, should I replace while in there?

white89gt

If it works, I'd just replace the bushings.

manicmechanic007

I had a very similar issue on a 04 heritage with the 4.2 engine
Code 2195 and 0303
Fought this for a year chasing my tail doing pinpoint tests for the codes
I had replaced the injectors on mine with Motorcraft
Come to find out, my new #3 injector was dead
Replaced that one with one of my originals that I took out
Fixed and no more codes, able to get it registered now
I made an injector electrical test harness using a trunk push button switch
Monitored the fuel pressure while I was trying to fire the injector = dead
Swapped my harness to #2 and click click the pressure went down
You could try that
Good luck

Kraken207

@manicmechanic007 I think this is the solution I'm going to end up seeing. I pulled the upper intake manifold again, and the Intake Manifold Runner Control looked solid, bushings were good, and both arms were in their banks. I'm going to clean the two 02 sensors I haven't hit yet, but after further investigation, I'm fairly confident I have bad Fuel Injectors in Cylinder 1 and Cylinder 3. This would cause all my 300 codes, and can cause the P171 code, and it is on the correct side. I'm also going to change the fuel filter just for good measure. Had to stop for the night, but I'm going to replace those two injectors, fuel filter, and clean the O2 sensors, and button her back up tomorrow, and see how it goes.