Engine running rough

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Feb 13, 2020 | 01:15 PM

Jrich21

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Engine running rough

Getting codes 0171, 0174. Replaced both top oxygen sensors, tps, and maf. Replacing the tps seemed to improve idle and performance. Nothing changed with maf. Still running a bit rough at idle and still getting codes. 04 f150 heritage xl

Feb 13, 2020 | 02:33 PM

pdqford

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From: Central NYS

Quote:

Originally Posted by Jrich21

What are the codes?

What did the freeze frame data show?

First SWAG is a vacuum leak.

Feb 13, 2020 | 05:54 PM

Jrich21

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Same codes as before

Feb 13, 2020 | 07:36 PM

pdqford

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My bad. You did post the codes.
Is this a 5.4?
Freeze frame data?

Feb 14, 2020 | 12:06 AM

CathedralCub

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I agree with vacuum leak being most likely.

Feb 14, 2020 | 01:43 AM

Jrich21

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4.6 no freeze frame data.

Feb 14, 2020 | 09:13 AM

F150Torqued

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From: San Antonio, Texas

If you have codes, there is (or was) Freeze Frame data. You might have cleared it / not looked for it, but it is stored at the instant a code is recorded. THAT's its purpose, so you can know what various other conditions present that might have lead to the generation of the codes.

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Feb 15, 2020 | 03:32 PM

DBGrif91

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From: Des Moines

More than likely, you’ll end up replacing the intake gaskets and possibly the manifold. It’s not uncommon for the manifold to warp and crack at the seams - smoke testing is a good way to know.

You can start by replacing old vac hoses, making sure the EGR isn’t sticking at idle, and run some seafoam or marvel mystery oil in the fuel to clean the injectors. If it’s due for spark plugs, replace them and the coil boots while you’re at it.

If no improvement, get it smoke tested to find out if it’s just the gaskets or the manifold too.

Feb 21, 2020 | 10:54 AM

#10

Jrich21

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I took battery cable loose and replaced DPFE sensor, almost seems like it made it worse. Getting different codes now though. P2197 ff 01/02 and p2195 ff 02/02

Feb 21, 2020 | 10:56 AM

#11

Jrich21

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Sorry was wrong previously. 04 f150 heritage, 4.2.

Feb 25, 2020 | 08:57 AM

#12

Wbruiser2

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From: Alabama

I don't know if the OP figured this out yet but I would take the intake manifold off and inspect it. Had a similar issue and once I took it off I found numerous burnt holes like in this picture.

Feb 26, 2020 | 02:06 PM

#13

Jrich21

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Replaced the egr valve. Drove about five miles on the highway. Stopped and went inside, came back an hour later started it up and the service engine light was out. Running good now!

May 26, 2020 | 05:59 PM

#14

Jrich21

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Light back on

Service engine light back on. Same codes 0171 & 0174. Replaced the manifold gaskets and isolator bolts. Runs better but still a little rough at idle and I’m getting 0174. But no more 0171.